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1

Advanced Video Guidance Sensor and Next Generation Autonomous Docking Sensors  

NASA Technical Reports Server (NTRS)

In recent decades, NASA's interest in spacecraft rendezvous and proximity operations has grown. Additional instrumentation is needed to improve manned docking operations' safety, as well as to enable telerobotic operation of spacecraft or completely autonomous rendezvous and docking. To address this need, Advanced Optical Systems, Inc., Orbital Sciences Corporation, and Marshall Space Flight Center have developed the Advanced Video Guidance Sensor (AVGS) under the auspices of the Demonstration of Autonomous Rendezvous Technology (DART) program. Given a cooperative target comprising several retro-reflectors, AVGS provides six-degree-of-freedom information at ranges of up to 300 meters for the DART target. It does so by imaging the target, then performing pattern recognition on the resulting image. Longer range operation is possible through different target geometries. Now that AVGS is being readied for its test flight in 2004, the question is: what next? Modifications can be made to AVGS, including different pattern recognition algorithms and changes to the retro-reflector targets, to make it more robust and accurate. AVGS could be coupled with other space-qualified sensors, such as a laser range-and-bearing finder, that would operate at longer ranges. Different target configurations, including the use of active targets, could result in significant miniaturization over the current AVGS package. We will discuss these and other possibilities for a next-generation docking sensor or sensor suite that involve AVGS.

Granade, Stephen R.

2004-01-01

2

Next Generation Advanced Video Guidance Sensor: Low Risk Rendezvous and Docking Sensor  

NASA Technical Reports Server (NTRS)

The Next Generation Advanced Video Guidance Sensor (NGAVGS) is being built and tested at MSFC. This paper provides an overview of current work on the NGAVGS, a summary of the video guidance heritage, and the AVGS performance on the Orbital Express mission. This paper also provides a discussion of applications to ISS cargo delivery vehicles, CEV, and future lunar applications.

Lee, Jimmy; Carrington, Connie; Spencer, Susan; Bryan, Thomas; Howard, Ricky T.; Johnson, Jimmie

2008-01-01

3

Advanced digital video surveillance  

NASA Astrophysics Data System (ADS)

In this paper we describe an Advanced Digital Video Surveillance system based on TASC-developed object behavior based video analysis and indexing prototype. The advantages of using video analysis in surveillance and physical security applications are twofold. Firstly, the ability to automatically analyze the surveillance video contents facilitates timely detection of events that require immediate attention. Secondly, the amount of video to be archived can be reduced considerably by recording only the portions of video that include behaviors and events of interest from vast amount of surveillance data being collected everyday. Our object-behavior and event based indexing paradigm for video data treats an identifiable object behavior, action or event as the basic indexing unit facilitating efficient querying and report generation as well as derivation of statistical information about the behavior patterns over periods of time. We describe our methodology and present preliminary results in near real time behavior and event detection.

Guler, Sadiye

2001-02-01

4

A Video Database Management System for Advancing Video Database Research  

Microsoft Academic Search

The most useful environments for advancing research and development in video databases are those that provide complete video database management, including (1) video preprocessing for content representation and indexing, (2) storage management for video, metadata and indices, (3) image and semantic -based query processing, (4) real- time buffer management, and (5) continuous media streaming. Such environments support the entire process

Walid G. Aref; Ann Christine Catlin; Jianping Fan; Ahmed K. Elmagarmid; Moustafa A. Hammad; Ihab F. Ilyas; Mirette S. Marzouk; Xingquan Zhu

2002-01-01

5

The Video Generation.  

ERIC Educational Resources Information Center

Video games are neither neutral nor harmless but represent very specific social and symbolic constructs. Research on the social content of today's video games reveals that sex bias and gender stereotyping are widely evident throughout the Nintendo games. Violence and aggression also pervade the great majority of the games. (MLF)

Provenzo, Eugene F., Jr.

1992-01-01

6

Video Manga : generating semantically meaningful video summaries  

Microsoft Academic Search

This paper presents methods for automatically creating pictorial video summaries that resemble comic books. The relative importance of video segments is computed from their length and novelty. Image and audio analysis is used to automatically detect and emphasize meaningful events. Based on this importance measure, we choose relevant keyframes. Selected keyframes are sized by importance, and then efficiently packed into

Shingo Uchihashi; Jonathan Foote; Andreas Girgensohn; John S. Boreczky

1999-01-01

7

Generation of Perspective and Panoramic Video from Omnidirectional Video  

Microsoft Academic Search

Existing software systems for visual exploration are limited in their capabilities in that they are only applicable to static omnidirectional images. We present a software system that has the capa- bility to generate at video rate (30 Hz), a large number of perspective and panoramic video streams from a single omnidirectional video in- put, using no more than a PC.

Venkata N. Peri; Shree K. Nayar

1997-01-01

8

Advances in Network-adaptive Video Streaming  

Microsoft Academic Search

Internet transmission is characterized by variations in throughput, delay, and packet loss, which can severely affect the quality of multimedia presentations delivered over the network. Still, Internet video streaming has ex- perienced phenomenal growth in the last few years, ow- ing to the extensive research in video coding and trans- mission. In this paper, we review several recent advances for

Bernd Girod; Jacob Chakareski; Mark Kalman; Yi J. Liang; Eric Setton; Rui Zhang

2002-01-01

9

Orbital Express Advanced Video Guidance Sensor  

Microsoft Academic Search

In May 2007 the first US-sponsored fully autonomous rendezvous and capture was successfully performed by DARPA's Orbital Express (OE) mission. For the following three months, the Boeing ASTRO spacecraft and the Ball Aerospace NEXTSat performed multiple rendezvous and docking maneuvers to demonstrate some of the technologies needed for satellite servicing. MSFC's advanced video guidance sensor (AVGS) was a near-field proximity

R. T. Howard; A. F. Heaton; R. M. Pinson; C. K. Carrington

2008-01-01

10

Naval threat countermeasure simulator and the IR_CRUISE_missiles models for the generation of infrared (IR) videos of maritime targets and background for input into advanced imaging IR seekers  

NASA Astrophysics Data System (ADS)

A new hardware-in-the-loop modeling technique was developed at the US Naval Research Laboratory (NRL) for the evaluation of IR countermeasures against advanced IR imaging anti-ship cruise missiles. The research efforts involved the creation of tools to generate accurate IR imagery and synthesize video to inject in to real-world threat simulators. A validation study was conducted to verify the accuracy and limitations of the techniques that were developed.

Taczak, Thomas M.; Dries, John W.; Gover, Robert E.; Snapp, Mary Ann; Williams, Elmer F.; Cahill, Colin P.

2002-07-01

11

Recent Advances in Video Meteor Photometry  

NASA Technical Reports Server (NTRS)

One of the most common (and obvious) problems with video meteor data involves the saturation of the output signal produced by bright meteors, resulting in the elimination of such meteors from photometric determinations. It is important to realize that a "bright" meteor recorded by intensified meteor camera is not what would be considered "bright" by a visual observer - indeed, many Generation II or III camera systems are saturated by meteors with a visual magnitude of 3, barely even noticeable to the untrained eye. As the relatively small fields of view (approx.30 ) of the camera systems captures at best modest numbers of meteors, even during storm peaks, the loss of meteors brighter than +3 renders the determination of shower population indices from video observations even more difficult. Considerable effort has been devoted by the authors to the study of the meteor camera systems employed during the Marshall Space Flight Center s Leonid ground-based campaigns, and a calibration scheme has been devised which can extend the useful dynamic range of such systems by approximately 4 magnitudes. The calibration setup involves only simple equipment, available to amateur and professional, and it is hoped that use of this technique will make for better meteor photometry, and move video meteor analysis beyond the realm of simple counts.

Swift, Wesley R.; Suggs, Robert M.; Meachem, Terry; Cooke, William J.

2003-01-01

12

Hidden Markov Models for Video Skim Generation  

Microsoft Academic Search

In this paper we present a statistical framework based on hidden Markov models (HMMs) for video skimming. A chain of HMMs is used to model subsequent story units: HMM states represent different visual-concepts, transitions model the temporal dependencies in each story unit, and stochastic observations are given by single shots. The skim is generated as an observation sequence, where, in

Sergio Benini; Pierangelo Migliorati; Riccardo Leonardi

2007-01-01

13

New view generation from a video sequence  

Microsoft Academic Search

The problem of three-dimensional (3-D) scene representation and view generation is a new subject in video signal processing. Our goal is to construct a new scene at a different viewing position based on a sequence of captured images. The method proposed here does not make use of a solid 3-D model of physical objects. We decompose the image into layers

Szu Sheng Chen; Hsueh-Ming Hang

1998-01-01

14

Advanced Video Guidance Sensor (AVGS) Development Testing  

NASA Technical Reports Server (NTRS)

NASA's Marshall Space Flight Center was the driving force behind the development of the Advanced Video Guidance Sensor, an active sensor system that provides near-range sensor data as part of an automatic rendezvous and docking system. The sensor determines the relative positions and attitudes between the active sensor and the passive target at ranges up to 300 meters. The AVGS uses laser diodes to illuminate retro-reflectors in the target, a solid-state camera to detect the return from the target, and image capture electronics and a digital signal processor to convert the video information into the relative positions and attitudes. The AVGS will fly as part of the Demonstration of Autonomous Rendezvous Technologies (DART) in October, 2004. This development effort has required a great deal of testing of various sorts at every phase of development. Some of the test efforts included optical characterization of performance with the intended target, thermal vacuum testing, performance tests in long range vacuum facilities, EMI/EMC tests, and performance testing in dynamic situations. The sensor has been shown to track a target at ranges of up to 300 meters, both in vacuum and ambient conditions, to survive and operate during the thermal vacuum cycling specific to the DART mission, to handle EM1 well, and to perform well in dynamic situations.

Howard, Richard T.; Johnston, Albert S.; Bryan, Thomas C.; Book, Michael L.

2004-01-01

15

Recent advances in rate control for video coding  

Microsoft Academic Search

In this paper, we review the recent advances in rate control techniques for video coding. The rate control algorithms recommended in the video coding standards are briefly described and analyzed. Recent advances, such as new concepts in rate-distortion modelling and quality constrained control, are presented. With these techniques, the rate control performance can be improved. The paper not only summarizes

Zhenzhong Chen; King Ngi Ngan

2007-01-01

16

Advanced Video Data-Acquisition System For Flight Research  

NASA Technical Reports Server (NTRS)

Advanced video data-acquisition system (AVDAS) developed to satisfy variety of requirements for in-flight video documentation. Requirements range from providing images for visualization of airflows around fighter airplanes at high angles of attack to obtaining safety-of-flight documentation. F/A-18 AVDAS takes advantage of very capable systems like NITE Hawk forward-looking infrared (FLIR) pod and recent video developments like miniature charge-couple-device (CCD) color video cameras and other flight-qualified video hardware.

Miller, Geoffrey; Richwine, David M.; Hass, Neal E.

1996-01-01

17

Home-video content analysis for MTV-style video generation  

NASA Astrophysics Data System (ADS)

Intelligent video pre-processing and authoring techniques that facilitate people to create MTV-style music video clips are investigated in this research. First, we present an automatic approach to detect and remove bad shots often occurring in home video, such as video with poor lighting or motion blur. Then, we consider the generation of MTV-style video clips by performing video and music tempo analysis and seeking an effective way in matching these two tempos. Experiment results are given to demonstrate the feasibility and efficiency of the proposed techniques for home video editing.

Lee, Shih-Hung; Yeh, Chia-Hung; Kuo, C. C. J.

2004-12-01

18

MTV-style home video generation via tempo analysis  

NASA Astrophysics Data System (ADS)

Intelligent video pre-processing and authoring techniques that facilitate people to create MTV-style music video clips are investigated in this research. First, we present an automatic approach to detect and remove bad shots often occurring in home video, such as video with poor lighting or motion blur. Then, we consider the generation of MTV-style video clips by performing video and music tempo analysis and seeking an effective way in matching these two tempos. Experiment results are given to demonstrate the feasibility and efficiency of the proposed techniques for home video editing.

Lee, Shih-Hung; Yeh, Chia H.; Kuo, C.-C. Jay

2004-10-01

19

Design of double video signal based location and stereo video signal generation system for humanoid robot  

Microsoft Academic Search

This article proposes a design of double video signal based location and stereo video signal generation system for humanoid robot. The traditional location method is introduced in this article. Then the improved method which is based on double video signal is proposed. This article also proposes the hardware design on the platform of TMS320DM642. At the end of this article,

Huan Tan; Qingmin Liao

2007-01-01

20

Advanced Video Analysis Needs for Human Performance Evaluation  

NASA Technical Reports Server (NTRS)

Evaluators of human task performance in space missions make use of video as a primary source of data. Extraction of relevant human performance information from video is often a labor-intensive process requiring a large amount of time on the part of the evaluator. Based on the experiences of several human performance evaluators, needs were defined for advanced tools which could aid in the analysis of video data from space missions. Such tools should increase the efficiency with which useful information is retrieved from large quantities of raw video. They should also provide the evaluator with new analytical functions which are not present in currently used methods. Video analysis tools based on the needs defined by this study would also have uses in U.S. industry and education. Evaluation of human performance from video data can be a valuable technique in many industrial and institutional settings where humans are involved in operational systems and processes.

Campbell, Paul D.

1994-01-01

21

The advanced helical generator.  

PubMed

A high explosive pulsed power generator called the advanced helical generator (AHG) has been designed, built, and successfully tested. The AHG incorporates design principles of voltage and current management to obtain a high current and energy gain. Its design was facilitated by the use of modern modeling tools as well as high precision manufacture. The result was a first-shot success. The AHG delivered 16 MA of current and 11 MJ of energy to a quasistatic 80 nH inductive load. A current gain of 160 times was obtained with a peak exponential rise time of 20 micros. We will describe in detail the design and testing of the AHG. PMID:20370202

Reisman, D B; Javedani, J B; Ellsworth, G F; Kuklo, R M; Goerz, D A; White, A D; Tallerico, L J; Gidding, D A; Murphy, M J; Chase, J B

2010-03-01

22

Automatic segmentation of moving objects for video object plane generation  

Microsoft Academic Search

The new video coding standard MPEG-4 is enabling content-based functionalities. It takes advantage of a prior decomposition of sequences into video object planes (VOPs) so that each VOP represents one moving object. A comprehensive review summarizes some of the most important motion segmentation and VOP generation techniques that have been proposed. Then, a new automatic video sequence segmentation algorithm that

Thomas Meier; King N. Ngan

1998-01-01

23

Advanced Medical Video Services through Context-Aware Medical Networks  

Microsoft Academic Search

The aim of this paper is to present a framework for advanced medical video delivery services, through network and patient-state awareness. Under this scope a context-aware medical networking platform is described. The developed platform enables proper medical video data coding and transmission according to both a) network availability and\\/or quality and b) patient status, optimizing thus network performance and telediagnosis.

Charalampos N. Doukas; Ilias Maglogiannis; Thomas Pliakas

2007-01-01

24

Automatic content generation for video self modeling  

Microsoft Academic Search

Video self modeling (VSM) is a behavioral intervention technique in which a learner models a target behavior by watchinga videoof himor herself. Its effectivenessin rehabilitation and education has been repeatedlydemonstratedbut technical challenges remain in creating video contents that depict previously unseen behaviors. In this paper, we propose a novel system that re-renders new talking-head sequences suitable to be used for

Ju Shen; Anusha Raghunathan; Sen-ching S. Cheung; Rita Patel

2011-01-01

25

Rapid video-based analysis system for advanced work measurement  

Microsoft Academic Search

A digital video-based approach is proposed to enhance work measurement and analysis by facilitating the generation of rapid time standards. This approach takes conservative videotaped analysis a giant step forward. A genuine description of the work situation is imported into the analytical system via digital video input, thereby enabling a free-of-work site attendance study for evaluating time and work performance.

M. Elnekave; I. Gilad

2006-01-01

26

Detailed Precipitation Measurements for GV: Advances in Video-Distrometers  

NASA Astrophysics Data System (ADS)

The 2D-Video-Distrometer (2DVD) is an established instrument for in-situ measurements of precipitation, delivering per-particle data for solid, liquid and mixed-phase precipitation and having over 80 successful deployments world-wide to its record. At its core, two orthogonally oriented, vertically displaced and precisely aligned high-speed cameras sample hydrometeors like rain, snow, hail, graupel, ice-pellets, etc. as they fall through a sampling area of approx. 100 cm². This measurement principle, i.e. having two projections for each detected particle while gathering statistically significant data by sampling over a substantial measurement area, allows capturing and evaluation of observables like diameter, oblateness and shape, vertical velocity, and contributions to the rain rate and to the cumulative amount of rain for each individual detected particle. If particles display rotational symmetry, estimation of horizontal velocity and (for particles exceeding a diameters of approx. 1.5 mm) canting angles can be gauged, again on a per-hydrometeor basis, as well. While the 2DVD has been successfully deployed during many ground validation campaigns, some of the inherent cost and complexity constraints have so far prevented the use of 2DVD's for some applications and in some environments. In order to address these limitations of the 2DVD, research has been conducted to develop a 1D-Video-Distrometer (1DVD) which employs only one camera system but tries to retain the capability to capture as many observables on a per-particle basis as possible. First results from our activities towards such a system with reduced complexity and deployment costs are presented and comparison of data sets gathered with both 1DVD and current generation 2DVD systems are provided. Current generations of the 2DVD can yield exceptionally high data rates, especially during extreme rain events like for example tropical storms. Therefore, the software suite which accompanies each device employs dedicated algorithms and procedures in order to meet the arising high demands with respect to throughput, scalability and stability, thus allowing the instrument to cope very well with such very high data rates. Advances in camera technology, which allow for higher resolutions and larger scan rates, are bound to contribute to further increases in the amount of data. Moreover, the degree of integration and the level of complexity in forming precipitation products, including measurements from GV, are also on the rise. Due to these influences, improvements to algorithms and data formats have been studied and first results of these improvements for the 2DVD and upcoming 1DVD are presented as well.

Schwinzerl, Martin; Lammer, Günter; Schönhuber, Michael

2014-05-01

27

Using GPU-generated virtual video stream for multi-sensor system  

NASA Astrophysics Data System (ADS)

Security and intelligence services are increasingly turning toward multi-sensor video surveillance which requires human ability to successfully fuse and comprehend the information provided by videos. A training system using the same front end as real multi-sensor system for users can significantly increase such human ability. The training system always needs scenarios replicating stressful situations which are videotaped in advance and played later. This not only puts a limitation on the training scenarios but also brings a high cost. This paper introduces a new framework, virtual video capture device for such training system. Using the latest graphics processing units (GPUs) technology, multiple video streams composed of computer graphics (CG) are generated on one high-end PC and ublished to a video stream server. Thus users can be trained using both real video streams and virtual video streams on one system. It also enables the training system to use real video streams incorporating augmented reality to improve situation awareness of the human.

Liao, Dezhi; Hennessey, Brian

2006-06-01

28

Robust video watermarking scheme using computer generated holographic technique  

NASA Astrophysics Data System (ADS)

A novel blind video watermarking scheme offering a low computational complexity is presented in which the computer generated holograms are used as the watermarks. In the scheme, the original video is divided into nonoverlapping groups of pictures (GOPs). A quantization method is used to insert the mark hologram into the low frequency wavelet coefficients of every GOP. The extraction procedure does not need the original video. Experimental results demonstrate that the presented scheme is transparent and robust to a variety of attacks, including compression, noise addition, filtering, occlusion, cropping and temporal attacks, etc. One of the most important advantages of the suggested method is its simplicity and practicality.

Li, Jianzhong

2013-06-01

29

Automatic generation of pictorial transcripts of video programs  

NASA Astrophysics Data System (ADS)

An automatic authoring system for the generation of pictorial transcripts of video programs which are accompanied by closed caption information is presented. A number of key frames, each of which represents the visual information in a segment of the video (i.e., a scene), are selected automatically by performing a content-based sampling of the video program. The textual information is recovered from the closed caption signal and is initially segmented based on its implied temporal relationship with the video segments. The text segmentation boundaries are then adjusted, based on lexical analysis and/or caption control information, to account for synchronization errors due to possible delays in the detection of scene boundaries or the transmission of the caption information. The closed caption text is further refined through linguistic processing for conversion to lower- case with correct capitalization. The key frames and the related text generate a compact multimedia presentation of the contents of the video program which lends itself to efficient storage and transmission. This compact representation can be viewed on a computer screen, or used to generate the input to a commercial text processing package to generate a printed version of the program.

Shahraray, Behzad; Gibbon, David C.

1995-03-01

30

Development of a Comprehensive Supervisor Training Program for Advanced Manufacturing Technology (December 1988-June 1991) (Video).  

National Technical Information Service (NTIS)

The ten-segment video presents a comprehensive video training program for first line supervisors in an advanced apparel manufacturing technology environment. There were several considerations which were to be incorporated in the program, two of which prov...

H. Korchen

1991-01-01

31

Advanced downhole periodic seismic generator  

DOEpatents

An advanced downhole periodic seismic generator system for transmitting variable frequency, predominantly shear-wave vibration into earth strata surrounding a borehole. The system comprises a unitary housing operably connected to a well head by support and electrical cabling and contains clamping apparatus for selectively clamping the housing to the walls of the borehole. The system further comprises a variable speed pneumatic oscillator and a self-contained pneumatic reservoir for producing a frequency-swept seismic output over a discrete frequency range.

Hardee, Harry C. (Albuquerque, NM); Hills, Richard G. (Las Cruces, NM); Striker, Richard P. (Albuquerque, NM)

1991-07-16

32

Comparing Simple and Advanced Video Tools as Supports for Complex Collaborative Design Processes  

ERIC Educational Resources Information Center

Working with digital video technologies, particularly advanced video tools with editing capabilities, offers new prospects for meaningful learning through design. However, it is also possible that the additional complexity of such tools does "not" advance learning. We compared in an experiment the design processes and learning outcomes of 24…

Zahn, Carmen; Pea, Roy; Hesse, Friedrich W.; Rosen, Joe

2010-01-01

33

Video coding for next-generation surveillance systems  

NASA Astrophysics Data System (ADS)

Video is used as recording media in surveillance system and also more frequently by the Swedish Police Force. Methods for analyzing video using an image processing system have recently been introduced at the Swedish National Laboratory of Forensic Science, and new methods are in focus in a research project at Linkoping University, Image Coding Group. The accuracy of the result of those forensic investigations often depends on the quality of the video recordings, and one of the major problems when analyzing videos from crime scenes is the poor quality of the recordings. Enhancing poor image quality might add manipulative or subjective effects and does not seem to be the right way of getting reliable analysis results. The surveillance system in use today is mainly based on video techniques, VHS or S-VHS, and the weakest link is the video cassette recorder, (VCR). Multiplexers for selecting one of many camera outputs for recording is another problem as it often filters the video signal, and recording is limited to only one of the available cameras connected to the VCR. A way to get around the problem of poor recording is to simultaneously record all camera outputs digitally. It is also very important to build such a system bearing in mind that image processing analysis methods becomes more important as a complement to the human eye. Using one or more cameras gives a large amount of data, and the need for data compression is more than obvious. Crime scenes often involve persons or moving objects, and the available coding techniques are more or less useful. Our goal is to propose a possible system, being the best compromise with respect to what needs to be recorded, movements in the recorded scene, loss of information and resolution etc., to secure the efficient recording of the crime and enable forensic analysis. The preventative effective of having a well functioning surveillance system and well established image analysis methods is not to be neglected. Aspects of this next generation of digital surveillance systems are discussed in this paper.

Klasen, Lena; Fahlander, Olov

1997-02-01

34

Video Teleconference (VTC) Capability. An Assessment of Battle Command Advanced Warfighting Experiment Observations.  

National Technical Information Service (NTIS)

The purpose of this paper is to briefly describe the video teleconference (VTC) capability as applied to battle command in the Advanced Warfighting Experiments (AWE) in the Battle Command Battle Laboratory (BCBL), January - May, 1994. The BCBL had the mis...

M. C. Ingram

1994-01-01

35

Using Heuristics to Evaluate the Overall User Experience of Video Games and Advanced Interaction Games  

Microsoft Academic Search

\\u000a This chapter describes an approach to evaluating user experience in video games and advanced interaction games (tabletop games)\\u000a by using heuristics. We provide a short overview of computer games with a focus on advanced interaction games and explain\\u000a the concept of user-centred design for games. Furthermore, we describe the history of heuristics for video games and the role\\u000a of user

Christina Koeffel; Wolfgang Hochleitner; Jakob Leitner; Michael Haller; Arjan Geven; Manfred Tscheligi

36

The Impact of Advance Organizers upon Students' Achievement in Computer-Assisted Video Instruction.  

ERIC Educational Resources Information Center

Describes a study of undergraduates that was conducted to determine the impact of advance organizers on students' achievement in computer-assisted video instruction (CAVI). Treatments of the experimental and control groups are explained, and results indicate that advance organizers do not facilitate near-transfer of rule-learning in CAVI.…

Saidi, Houshmand

1994-01-01

37

MASCOT: Metadata for Advanced Scalable Video Coding Tools.  

National Technical Information Service (NTIS)

The goal of the MASCOT project was to develop new video coding schemes and tools that provide both an increased coding efficiency as well as extended scalability features compared to technology that was available at the beginning of the project. Towards t...

A. Smolic B. Pesquet-Popescu C. Bernard H. J. A. M. Heijmans L. Torres M. Domanski P. Schelkens

2003-01-01

38

Automated Music Video Generation Using Multi-level Feature-based Segmentation  

NASA Astrophysics Data System (ADS)

The expansion of the home video market has created a requirement for video editing tools to allow ordinary people to assemble videos from short clips. However, professional skills are still necessary to create a music video, which requires a stream to be synchronized with pre-composed music. Because the music and the video are pre-generated in separate environments, even a professional producer usually requires a number of trials to obtain a satisfactory synchronization, which is something that most amateurs are unable to achieve.

Yoon, Jong-Chul; Lee, In-Kwon; Byun, Siwoo

39

Improved Side Information Generation and Virtual Channel Modeling for Distributed Video Coding  

Microsoft Academic Search

Distributed video coding (DVC) is a new paradigm in video coding, which is receiving a lot of interests nowadays. Side Information (SI) generation is a key function in the DVC decoder, and plays a key-role in determining the performance of the codec. This paper proposes an improved side information generation scheme, which exploits both spatial and temporal correlations in the

Xiaofei Zong; Bo Yang; Aidong Men

2009-01-01

40

Virtual View Generation for 3D Digital Video  

Microsoft Academic Search

Virtual reality systems use digital models to provide interactive viewing. We present a 3D digital video system that attempts to provide the same capabilities for actual performances such as dancing. Recreating the original dynamic scene in 3D, the system allows photorealistic interactive playback from arbitrary viewpoints using video streams of a given scene from multiple perspectives

Saied Moezzi; Li-cheng Tai; Philippe Gerard

1997-01-01

41

Real-Time Video Filtering and Overlay Character Generation on FPGA  

Microsoft Academic Search

Real-time video processing is a rapidly evolving field with growing applications in science and engineering. Portable video processing systems require design which reduces the power, memory usage, and resource utilization while maintaining real-time operation. General system architecture for real-time video filtering and overlay character generation, based on a Field Programmable Gate Array (FPGA) is presented and evaluated. After initial configuration

Babu T Chacko; Siddharth Shelly

2010-01-01

42

Advanced motion threading for 3D wavelet video coding  

Microsoft Academic Search

This paper presents an advanced motion threading technique for improved performance in 3D wavelet coding. First, we extend an original motion threading idea of ours to a lifting- based implementation. Methods for processing many-to-one pixel mapping and non-referred pixels and for enabling fractional-pixel alignment in motion threading are proposed to reduce the wavelet boundary effects. Second, we devise an advanced

Lin Luo; Feng Wu; Shipeng Li; Zixiang Xiong; Zhenquan Zhuang

2004-01-01

43

Advanced motion threading for 3D wavelet video coding  

Microsoft Academic Search

This paper presents an advanced motion threading technique for improved performance in 3D wavelet coding. First, we extend an original motion threading idea of ours to a lifting-based implementation. Methods for enabling fractional-pixel alignment in motion threading and for processing many-to-one pixel mapping and non-referred pixels are proposed to reduce the wavelet boundary effects. Second, we devise an advanced motion

Lin Luo; Feng Wu; Shipeng Li; Zixiang Xiong; Zhenquan Zhuang

2004-01-01

44

Joint-source-channel coding scheme for scalable video-coding-based digital video broadcasting, second generation satellite broadcasting system  

NASA Astrophysics Data System (ADS)

We propose a joint-source-channel coding (JSCC) scheme that can provide and sustain high-quality video service in spite of deteriorated transmission channel conditions of the second generation of the digital video broadcasting (DVB-S2) satellite broadcasting service. Especially by combining the layered characteristics of the SVC (scalable video coding) video and the robust channel coding capability of LDPC (low-density parity check) employed for DVB-S2, a new concept of JSCC for digital satellite broadcasting service is developed. Rain attenuation in high-frequency bands such as the Ka band is a major factor for lowering the link capacity in satellite broadcasting service. Therefore, it is necessary to devise a new technology to dynamically manage the rain attenuation by adopting a JSCC scheme that can apply variable code rates for both source and channel coding. For this purpose, we develop a JSCC scheme by combining SVC and LDPC, and prove the performance of the proposed JSCC scheme by extensive simulations where SVC coded video is transmitted over various error-prone channels with AWGN (additive white Gaussian noise) patterns in DVB-S2 broadcasting service.

Seo, Kwang-Deok; Chi, Won Sup; Lee, In Ki; Chang, Dae-Ig

2010-10-01

45

3D model generation using unconstrained motion of a hand-held video camera  

Microsoft Academic Search

We have developed a shape and structure capture system which constructs accurate, realistic 3D models from video imagery taken with a single freely moving handheld camera. Using an inexpensive off the shelf acquisition system such as a hand-held video camera, we demonstrate the feasibility of fast and accurate generation of these 3D models at a very low cost. In our

C. Baker; C. Debrunner; M. Whitehorn

2006-01-01

46

I tube, you tube, everybody tubes: analyzing the world's largest user generated content video system  

Microsoft Academic Search

User Generated Content (UGC) is re-shaping the way people watch video and TV, with millions of video producers and consumers. In particular, UGC sites are creating new view- ing patterns and social interactions, empowering users to be more creative, and developing new business opportunities. To better understand the impact of UGC systems, we have analyzed YouTube, the world's largest UGC

Meeyoung Cha; Haewoon Kwak; Pablo Rodriguez; Yong-yeol Ahn; Sue Moon

2007-01-01

47

Teaching French Transformational Grammar by Means of Computer-Generated Video-Tapes.  

ERIC Educational Resources Information Center

This paper describes a pilot program in an integrated media presentation of foreign languages and the production and usage of seven computer-generated video tapes which demonstrate various aspects of French syntax. This instructional set could form the basis for CAI lessons in which the student is presented images identical to those on the video

Adler, Alfred; Thomas, Jean Jacques

48

Technology advancement of an oxygen generation subsystem  

NASA Technical Reports Server (NTRS)

An oxygen generation subsystem based on water electrolysis was developed and tested to further advance the concept and technology of the spacecraft air revitalization system. Emphasis was placed on demonstrating the subsystem integration concept and hardware maturity at a subsystem level. The integration concept of the air revitalization system was found to be feasible. Hardware and technology of the oxygen generation subsystem was demonstrated to be close to the preprototype level. Continued development of the oxygen generation technology is recommended to further reduce the total weight penalties of the oxygen generation subsystem through optimization.

Lee, M. K.; Burke, K. A.; Schubert, F. H.; Wynveen, R. A.

1979-01-01

49

Video decision support tool for advance care planning in dementia: randomised controlled trial  

Microsoft Academic Search

Objective To evaluate the effect of a video decision support tool on the preferences for future medical care in older people if they develop advanced dementia, and the stability of those preferences after six weeks.Design Randomised controlled trial conducted between 1 September 2007 and 30 May 2008. Setting Four primary care clinics (two geriatric and two adult medicine) affiliated with

Angelo E Volandes; Michael K Paasche-Orlow; Michael J Barry; Muriel R Gillick; Kenneth L Minaker; Yuchiao Chang; E Francis Cook; Elmer D Abbo; Areej El-Jawahri; Susan L Mitchell

2009-01-01

50

Using Digital Video Editing to Shape Novice Teachers: A Generative Process for Nurturing Professional Growth  

ERIC Educational Resources Information Center

The authors describe the generative process for using video editing for teachers' professional development. The article provides a rationale, a theoretical framework, and a critical review of the authors' work over the past five years.

Calandra, Brendan; Brantley-Dias, Laurie

2010-01-01

51

Omnifocus video camera  

NASA Astrophysics Data System (ADS)

The omnifocus video camera takes videos, in which objects at different distances are all in focus in a single video display. The omnifocus video camera consists of an array of color video cameras combined with a unique distance mapping camera called the Divcam. The color video cameras are all aimed at the same scene, but each is focused at a different distance. The Divcam provides real-time distance information for every pixel in the scene. A pixel selection utility uses the distance information to select individual pixels from the multiple video outputs focused at different distances, in order to generate the final single video display that is everywhere in focus. This paper presents principle of operation, design consideration, detailed construction, and over all performance of the omnifocus video camera. The major emphasis of the paper is the proof of concept, but the prototype has been developed enough to demonstrate the superiority of this video camera over a conventional video camera. The resolution of the prototype is high, capturing even fine details such as fingerprints in the image. Just as the movie camera was a significant advance over the still camera, the omnifocus video camera represents a significant advance over all-focus cameras for still images.

Iizuka, Keigo

2011-04-01

52

Omnifocus video camera.  

PubMed

The omnifocus video camera takes videos, in which objects at different distances are all in focus in a single video display. The omnifocus video camera consists of an array of color video cameras combined with a unique distance mapping camera called the Divcam. The color video cameras are all aimed at the same scene, but each is focused at a different distance. The Divcam provides real-time distance information for every pixel in the scene. A pixel selection utility uses the distance information to select individual pixels from the multiple video outputs focused at different distances, in order to generate the final single video display that is everywhere in focus. This paper presents principle of operation, design consideration, detailed construction, and over all performance of the omnifocus video camera. The major emphasis of the paper is the proof of concept, but the prototype has been developed enough to demonstrate the superiority of this video camera over a conventional video camera. The resolution of the prototype is high, capturing even fine details such as fingerprints in the image. Just as the movie camera was a significant advance over the still camera, the omnifocus video camera represents a significant advance over all-focus cameras for still images. PMID:21529037

Iizuka, Keigo

2011-04-01

53

Video denoising using overlapped motion compensation and advanced collaborative filtering  

NASA Astrophysics Data System (ADS)

We present spatiotemporal denoising based on overlapped motion compensation and advanced collaborative filtering. First, noise-robust overlapped motion compensation is performed on a block basis for temporal grouping. Next, the K-nearest neighbors of each block are grouped in a 3D array, and the 3D array is transformed. Then, adaptive soft thresholding is performed in the 3D transform domain. In addition, a modified weighting strategy for aggregation is applied for better visual quality. Simulation results show that the proposed algorithm improves the peak signal-to-noise ratio performance by about 2 dB in comparison with the state-of-the-art technique while providing much better subjective visual quality.

Lee, Tae Hwan; Kang, Jin-Ku; Song, Byung Cheol

2012-04-01

54

Advanced Thermoelectric Materials for Radioisotope Thermoelectric Generators  

NASA Technical Reports Server (NTRS)

This slide presentation reviews the progress and processes involved in creating new and advanced thermoelectric materials to be used in the design of new radioiootope thermoelectric generators (RTGs). In a program with Department of Energy, NASA is working to develop the next generation of RTGs, that will provide significant benefits for deep space missions that NASA will perform. These RTG's are planned to be capable of delivering up to 17% system efficiency and over 12 W/kg specific power. The thermoelectric materials being developed are an important step in this process.

Caillat, Thierry; Hunag, C.-K.; Cheng, S.; Chi, S. C.; Gogna, P.; Paik, J.; Ravi, V.; Firdosy, S.; Ewell, R.

2008-01-01

55

Next Generation NASA GA Advanced Concept  

NASA Technical Reports Server (NTRS)

Not only is the common dream of frequent personal flight travel going unfulfilled, the current generation of General Aviation (GA) is facing tremendous challenges that threaten to relegate the Single Engine Piston (SEP) aircraft market to a footnote in the history of U.S. aviation. A case is made that this crisis stems from a generally low utility coupled to a high cost that makes the SEP aircraft of relatively low transportation value and beyond the means of many. The roots of this low value are examined in a broad sense, and a Next Generation NASA Advanced GA Concept is presented that attacks those elements addressable by synergistic aircraft design.

Hahn, Andrew S.

2006-01-01

56

Advanced motion compensation techniques for blocking artifacts reduction in 3-D video coding systems  

Microsoft Academic Search

This paper describes a new 3-D framework for the construction of a hybrid motion compensation model to reduce blocking artifacts in a highly scalable video coding system. Previous works have focused primarily on using control grid interpolation (CGI) or over-lapped block motion compensation (OBMC) to reduce blocking artifacts. However, both methods generate distinct side effects, such as PSNR degradation or

Cho-chun Cheng; Wen-liang Hwang; Zuowei Shen; Tao Xia

2005-01-01

57

X-Ray Calibration Facility/Advanced Video Guidance Sensor Test  

NASA Technical Reports Server (NTRS)

The advanced video guidance sensor was tested in the X-Ray Calibration facility at Marshall Space Flight Center to establish performance during vacuum. Two sensors were tested and a timeline for each are presented. The sensor and test facility are discussed briefly. A new test stand was also developed. A table establishing sensor bias and spot size growth for several ranges is detailed along with testing anomalies.

Johnston, N. A. S.; Howard, R. T.; Watson, D. W.

2004-01-01

58

ADVANCED CO2 CYCLE POWER GENERATION  

SciTech Connect

Research is being conducted under United States Department of Energy (DOE) Contract DE-FC26-02NT41621 to develop a conceptual design and determine the performance characteristics of a new IGCC plant configuration that facilitates CO{sub 2} removal for sequestration. This new configuration will be designed to achieve CO{sub 2} sequestration without the need for water gas shifting and CO{sub 2} separation, and may eliminate the need for a separate sequestration compressor. This research introduces a novel concept of using CO{sub 2} as a working fluid for an advanced coal gasification based power generation system, where it generates power with high system efficiency while concentrating CO{sub 2} for sequestration. This project supports the DOE research objective of development of concepts for the capture and storage of CO{sub 2}.

A. Nehrozoglu

2004-01-01

59

Effects of Generative Video on Students' Scientific Problem Posing. Draft.  

ERIC Educational Resources Information Center

A central premise of the discovery-learning and progressive education movements was that the child's own questions are the most appropriate starting point for instruction. Recent advances present new opportunities for discovery-oriented learning. This project has been attempting to create a classroom environment which affords students the…

Hickey, Daniel T.; Petrosino, Anthony

60

Advanced Photon Source (APS) Colloquium Lectures from 2004 to the Present (Videos)  

DOE Data Explorer

The Advanced Photon Source (APS) at Argonne National Laboratory provides brilliant x-ray beams for research in almost all scientific disciplines. These x-rays allow scientists to pursue new knowledge about the structure and function of materials in the center of the Earth and in outer space, and all points in between. The monthly APS Colloquium series brings distinguished scientists in all disciplines to lecture on their research. Approximately ten years worth of these presentations have been videoed and are freely available to the public.

61

Building Next Generation Video Game Collections in Academic Libraries  

ERIC Educational Resources Information Center

Most academic libraries do not yet have gaming collections, let alone gaming services and facilities that support the unique and growing teaching and research needs of campus environments. Academic libraries in particular need to start thinking about developing the next generation of gaming collections and services. This article examines the…

Laskowski, Mary; Ward, David

2009-01-01

62

A Novel Temporal Generative Model of Natural Video as an Internal Model in Early Vision  

Microsoft Academic Search

In computational neuroscience one application ofgenerativemodelsistoexaminehowthestatisticsofsen- soryinputdataarerelatedtothepropertiesofcorrespond- ingsensoryneuralnetworks. Inthisapproachitisassumed that neural networks are tuned to the properties of input data, that is, that they have learned e-cient internal rep- resentationsoftheirenvironment. Inthispaperwepresent a hypothetical internal representation for natural video at the level of early vision, or more precisely, at the level of simple and complex cells. We deflne a two-layer generative

Jarmo Hurri; Aapo Hyvarinen

2002-01-01

63

Moving objects extraction method in H.264/advanced video coding bit stream of a complex scene  

NASA Astrophysics Data System (ADS)

For the purpose of extracting moving objects from H.264/advanced video coding (AVC) bit stream of a complex scene, an algorithm based on maximum a posteriori Markov random field (MRF) framework to extract moving objects directly from H.264 compressed video is proposed in this paper. It mainly involves encoding information of motion vectors (MVs) and block partition modes in H.264/AVC bit stream and utilizes temporal continuity and spatial consistency of moving object's pieces. First, it retrieves MVs and block partition modes of identical 4×4 pixel blocks in P frames and establishes Gaussian mixture model (GMM) of the phase of MVs as a reference background, and then creates MRF model based on MVs, block partition modes, the GMM of the background, spatial, and temporal consistency. The moving objects are retrieved by solving the MRF model. The experimental results show that it can perform robustly in a complex environment and the precision and recall have been improved over the existing algorithm.

Mingsheng, Chen; Mingxin, Qin; Guangming, Liang; Jixiang, Sun; Xu, Ning

2013-08-01

64

Advanced flight deck for next generation aircraft  

Microsoft Academic Search

Alternative Flight Management System (FMS) human interface and Advanced Primary Flight Display (PFD) concepts are needed as the complexities of understanding and operating increased functionality on equipment continue to burden and confuse an already inundated pilot. In 1997 Rockwell Collins Inc. designed an advanced FMS display\\/interface and enhanced an existing 3D PFD that significantly reduced human interface problems between users

Robert A. Faerber; T. J. Etherington

1998-01-01

65

Layered Low-Density Generator Matrix Codes for Super High Definition Scalable Video Coding System  

NASA Astrophysics Data System (ADS)

In this paper, we introduce layered low-density generator matrix (Layered-LDGM) codes for super high definition (SHD) scalable video systems. The layered-LDGM codes maintain the correspondence relationship of each layer from the encoder side to the decoder side. This resulting structure supports partial decoding. Furthermore, the proposed layered-LDGM codes create highly efficient forward error correcting (FEC) data by considering the relationship between each scalable component. Therefore, the proposed layered-LDGM codes raise the probability of restoring the important components. Simulations show that the proposed layered-LDGM codes offer better error resiliency than the existing method which creates FEC data for each scalable component independently. The proposed layered-LDGM codes support partial decoding and raise the probability of restoring the base component. These characteristics are very suitable for scalable video coding systems.

Tonomura, Yoshihide; Shirai, Daisuke; Nakachi, Takayuki; Fujii, Tatsuya; Kiya, Hitoshi

66

Advances in Efficient Resource Allocation for Packet-Based Real-Time Video Transmission  

Microsoft Academic Search

Multimedia applications involving the transmission of video over communication networks are rapidly increasing in popularity. Such applications can greatly benefit from adapting video coding parameters to network conditions as well as adapting network parameters to better support the application requirements. These two dimensions can both be viewed as allocating source and network resources to improve video quality. We highlight recent

AGGELOS K. KATSAGGELOS; YIFTACH EISENBERG; FAN ZHAI; RANDALL BERRY; THRASYVOULOS N. PAPPAS

2005-01-01

67

Coal gasification for advanced power generation  

Microsoft Academic Search

This paper provides a review of the development and deployment of coal based gasification technologies for power generation. The global status of gasification is described covering the various process and technology options. The use of gasification for power generation is then highlighted including the advantages and disadvantages of this means for coal utilisation. The R, D & D needs and

Andrew J. Minchener

2005-01-01

68

Fresnel hologram generation using an HD resolution depth range video camera  

NASA Astrophysics Data System (ADS)

Holography is considered as an ideal 3D display method. We generated a hologram under white light. The infrared depth camera, which we used, captures the depth information as well as color video of the scene in 20mm of accuracy at 2m of object distance. In this research, we developed a software converter to convert the HD resolution depth map to the hologram. In this conversion method, each elemental diffraction pattern on a hologram plane was calculated beforehand according to the object distance and the maximum diffraction angle determined by the reconstruction SLM device (high resolution LCOS). The reconstructed 3D image was observed.

Oi, Ryutaro; Mishina, Tomoyuki; Yamamoto, Kenji; Senoh, Takanori; Kurita, Taiichiro

2010-02-01

69

Imaging morphodynamics of human blood cells in vivo with video-rate third harmonic generation microscopy  

PubMed Central

With a video-rate third harmonic generation (THG) microscopy system, we imaged the micro-circulation beneath the human skin without labeling. Not only the speed of circulation but also the morpho-hydrodynamics of blood cells can be analyzed. Lacking of nuclei, red blood cells (RBCs) shows typical parachute-like and hollow-core morphology under THG microscopy. Quite different from RBCs, every now and then, round and granule rich blood cells with strong THG contrast appear in circulation. The corresponding volume densities in blood, evaluated from their frequencies of appearance and the velocity of circulation, fall within the physiological range of human white blood cell counts.

Chen, Chien-Kuo; Liu, Tzu-Ming

2012-01-01

70

Fast thumbnail generation for MPEG video by using a multiple-symbol lookup table  

NASA Astrophysics Data System (ADS)

A novel method using a multiple-symbol lookup table (mLUT) is proposed to fast-skip the ac coefficients (codewords) not needed to construct a dc image from MPEG-1/2 video streams, resulting in fast thumbnail generation. For MPEG-1/2 video streams, thumbnail generation schemes usually extract dc images directly in a compressed domain where a dc image is constructed using a dc coefficient and a few ac coefficients from among the discrete cosine transform (DCT) coefficients. However, it is required that all codewords for DCT coefficients should be fully decoded whether they are needed or not in generating a dc image, since the bit length of a codeword coded with variable-length coding (VLC) cannot be determined until the previous VLC codeword has been decoded. Thus, a method using a mLUT designed for fast-skipping unnecessary DCT coefficients to construct a dc image is proposed, resulting in a significantly reduced number of table lookups (LUT count) for variable-length decoding of codewords. Experimental results show that the proposed method significantly improves the performance by reducing the LUT count by 50%.

Kim, Myounghoon; Lee, Hoonjae; Yoon, Ja-Cheon; Kim, Hyeokman; Sull, Sanghoon

2009-03-01

71

Impact of Advance Control on Microturbine Generation System Performance  

NASA Astrophysics Data System (ADS)

Advance control employed in microturbine generation system (MTGS) is expected to improve its performance in responding to grid faults. This paper compares the effect of advance control of MTGS power conversion topology on the performance in riding through the grid faults. The analysis and investigation study through simulation shows there is no significant different on MTGS output performance even advance control is employed for its rectifier.

Kamil Mat Hussin, Ahmad; Zamri Che Wanik, Mohd

2013-06-01

72

Recent advances in RF power generation  

SciTech Connect

This paper is a review of the progress and methods used in RF generation for particle accelerators. The frequencies of interest are from a few megahertz to 100 GHz, and the powers are for super linear collider applications, but in this case the pulses are short, generally below 1 {mu}s. The very high-power, short-pulse generators are only lightly reviewed here, and for more details the reader should follow the specialized references. Different RF generators excel over various parts of the frequency spectrum. Below 100 MHz solid-state devices and gridded tubes prevail, while the region between 400 MHz and 3 GHz, the cyclotron-resonant devices predominate, and above 250 GHz, Free-Electron Lasers and ubitrons are the most powerful generators. The emphasis for this review is on microwave generation at frequencies below 20 GHz, so the cyclotron-resonant devices are only partially reviewed, while the progress on free-electron laser and ubitrons is not reviewed in this paper. 39 refs., 4 figs.

Tallerico, P.J.

1990-01-01

73

Advancing-layers method for generation of unstructured viscous grids  

NASA Technical Reports Server (NTRS)

A novel approach for generating highly stretched grids which is based on a modified advancing-front technique and benefits from the generality, flexibility, and grid quality of the conventional advancing-front-based Euler grid generators is presented. The method is self-sufficient for the insertion of grid points in the boundary layer and beyond. Since it is based on a totally unstructured grid strategy, the method alleviates the difficulties stemming from the structural limitations of the prismatic techniques.

Pirzadeh, Shahyar

1993-01-01

74

Next Generation NASA GA Advanced Concept  

Microsoft Academic Search

Not only is the common dream of frequent personal flight travel going unfulfilled, the current generation of General Aviation (GA) is facing tremendous challenges that threaten to relegate the Single Engine Piston (SEP) aircraft market to a footnote in the history of U.S. aviation. A case is made that this crisis stems from a generally low utility coupled to a

Andrew S. Hahn

75

Nonlinear loss mechanisms in advanced magnetohydrodynamic generators  

Microsoft Academic Search

Development of improved computer codes for solving the MHD problem has led to improved techniques for inverting the large matrixes that appear in the formulation and application of STD Research Corporation's direct solution of the electrical part of the MHD problem. Application of the STD Research MHD-generator-simulation computer codes to real MHD channels has verified the validity and accuracy of

S. T. Demetriades; C. D. Maxwell; E. D. Doss; D. A. Oliver; G. S. Argyropoulos; C. D. Aliprantis; S. A. Zwick

1975-01-01

76

Advanced Nondestructive Evaluation for Steam Generator Tubing.  

National Technical Information Service (NTIS)

This report describes research activities carried out at Argonne National Laboratory (ANL) as part of the Steam Generator (SG) Tube Integrity Program sponsored by the U.S. Nuclear Regulatory Commission (USNRC). As a follow-up to a preceding publication on...

S. Bakhtiari J. Y. Park D. S. Kupperman S. Majumdar W. J. Shack

2001-01-01

77

Thoracic metastasis in advanced ovarian cancer: comparison between computed tomography and video-assisted thoracic surgery  

PubMed Central

Objective To determine which computed tomography (CT) imaging features predict pleural malignancy in patients with advanced epithelial ovarian carcinoma (EOC) using video-assisted thoracic surgery (VATS), pathology, and cytology findings as the reference standard. Methods This retrospective study included 44 patients with International Federation of Obstetrics and Gynecology (FIGO) stage III or IV primary or recurrent EOC who had chest CT ?30 days before VATS. Two radiologists independently reviewed the CT studies and recorded the presence and size of pleural effusions and of ascites; pleural nodules, thickening, enhancement, subdiaphragmatic tumour deposits and supradiaphragmatic, mediastinal, hilar, and retroperitoneal adenopathy; and peritoneal seeding. VATS, pathology, and cytology findings constituted the reference standard. Results In 26/44 (59%) patients, pleural biopsies were malignant. Only the size of left-sided pleural effusion (reader 1: rho=-0.39, p=0.01; reader 2: rho=-0.37, p=0.01) and presence of ascites (reader 1: rho=-0.33, p=0.03; reader 2: rho=-0.35, p=0.03) were significantly associated with solid pleural metastasis. Pleural fluid cytology was malignant in 26/35 (74%) patients. Only the presence (p=0.03 for both readers) and size (reader 1: rho=0.34, p=0.04; reader 2: rho=0.33, p=0.06) of right-sided pleural effusion were associated with malignant pleural effusion. Interobserver agreement was substantial (kappa=0.78) for effusion size and moderate (kappa=0.46) for presence of solid pleural disease. No other CT features were associated with malignancy at biopsy or cytology. Conclusion In patients with advanced EOC, ascites and left-sided pleural effusion size were associated with solid pleural metastasis, while the presence and size of right-sided effusion were associated with malignant pleural effusion. No other CT features evaluated were associated with pleural malignancy.

Mironov, Oleg; Sala, Evis; Mironov, Svetlana; Pannu, Harpreet; Chi, Dennis S.

2011-01-01

78

Randomized Controlled Trial of a Video Decision Support Tool for Cardiopulmonary Resuscitation Decision Making in Advanced Cancer  

PubMed Central

Purpose Decision making regarding cardiopulmonary resuscitation (CPR) is challenging. This study examined the effect of a video decision support tool on CPR preferences among patients with advanced cancer. Patients and Methods We performed a randomized controlled trial of 150 patients with advanced cancer from four oncology centers. Participants in the control arm (n = 80) listened to a verbal narrative describing CPR and the likelihood of successful resuscitation. Participants in the intervention arm (n = 70) listened to the identical narrative and viewed a 3-minute video depicting a patient on a ventilator and CPR being performed on a simulated patient. The primary outcome was participants' preference for or against CPR measured immediately after exposure to either modality. Secondary outcomes were participants' knowledge of CPR (score range of 0 to 4, with higher score indicating more knowledge) and comfort with video. Results The mean age of participants was 62 years (standard deviation, 11 years); 49% were women, 44% were African American or Latino, and 47% had lung or colon cancer. After the verbal narrative, in the control arm, 38 participants (48%) wanted CPR, 41 (51%) wanted no CPR, and one (1%) was uncertain. In contrast, in the intervention arm, 14 participants (20%) wanted CPR, 55 (79%) wanted no CPR, and 1 (1%) was uncertain (unadjusted odds ratio, 3.5; 95% CI, 1.7 to 7.2; P < .001). Mean knowledge scores were higher in the intervention arm than in the control arm (3.3 ± 1.0 v 2.6 ± 1.3, respectively; P < .001), and 65 participants (93%) in the intervention arm were comfortable watching the video. Conclusion Participants with advanced cancer who viewed a video of CPR were less likely to opt for CPR than those who listened to a verbal narrative.

Volandes, Angelo E.; Paasche-Orlow, Michael K.; Mitchell, Susan L.; El-Jawahri, Areej; Davis, Aretha Delight; Barry, Michael J.; Hartshorn, Kevan L.; Jackson, Vicki Ann; Gillick, Muriel R.; Walker-Corkery, Elizabeth S.; Chang, Yuchiao; Lopez, Lenny; Kemeny, Margaret; Bulone, Linda; Mann, Eileen; Misra, Sumi; Peachey, Matt; Abbo, Elmer D.; Eichler, April F.; Epstein, Andrew S.; Noy, Ariela; Levin, Tomer T.; Temel, Jennifer S.

2013-01-01

79

The design and simulated performance of a mobile video telephony application for satellite third-generation wireless systems  

Microsoft Academic Search

The design and performance of a low bit-rate video telephony service for mobile third-generation (3G) systems is presented. The ITU-T G.723.1 speech coding and the ITU-T H.263 video coding recommendations are used, as proposed by the ITU-T H.324 low bit-rate multimedia communications recommendation. The target bit-rate for the H.324 service is 64 kb\\/s. The design is performed in conjunction with

Christian Dubuc; Daniel Boudreau; François Patenaude

2001-01-01

80

Advanced spray generator of singlet oxygen  

NASA Astrophysics Data System (ADS)

A spray type singlet oxygen generator (SOG) for chemical oxygen-iodine laser (COIL) was studied. Mathematical modeling has shown that a high O II(1?) yield can be attained with BHP (basic hydrogen peroxide) spray in the Cl II-He atmosphere. It was found experimentally that O II(1?) was produced with a >=50% yield at a total pressure up to 50 kPa (375 Torr). A rotating separator was developed that can segregate even very small droplets (>=0.5 ?m) from O II(1?) flow.

Spalek, Otomar; Hrubý, Jan; Jirásek, Vít; ?enský, Miroslav; Kodymová, Jarmila; Picková, Irena

2007-05-01

81

Videos from the Advanced Light Source (ALS) on YouTube  

DOE Data Explorer

The Advanced Light Source (ALS), a DOE Scientific User Facility and a division of Lawrence Berkeley National Laboratory, is one of the world's brightest sources of ultraviolet and soft-x-ray beams, generating intense light for scientific and technical research. The ALS produces light in the x-ray region of the electromagnetic spectrum that is one billion times brighter than the sun. This extraordinary tool offers unprecedented opportunities for state-of-the art research in materials science, biology, chemistry, physics, and the environmental sciences. The channel includes twelve presentations from the ALS 2012 Users Meeting.

82

Materials choices for the advanced LWR steam generators  

SciTech Connect

Current light water reactor (LWR) steam generators have been affected by a variety of corrosion and mechanical damage degradation mechanisms. Included are wear caused by tube vibration, intergranular corrosion, pitting, and thinning or wastage of the steam generator tubing and accelerated corrosion of carbon steel supports (denting). The Electric Power Research Institute (EPRI) and the Steam Generator Owners Groups (I, II) have sponsored laboratory and field studies to provide ameliorative actions for the majority of the damage forms experienced to date. Some of the current corrosion mechanisms are aggravated or caused by unique materials choices or materials interactions. New materials have been proposed and at least partially qualified for use in replacement model steam generators, including an advanced LWR design. In so far as possible, the materials choices for the advanced LWR steam generator avoid the corrosion pitfalls seemingly inherent in the current designs. The EPRI Steam Generator Project staff has recommended materials and design choices for a new steam generator. Based on these recommendations we believe that the advanced LWR steam generators will be much less affected by corrosion and mechanical damage mechanisms than are now experienced.

Paine, J.P.N.; Shoemaker, C.E.; McIlree, A.R.

1987-01-01

83

Advances in Hardware Architectures for Image and Video Coding - A Survey  

Microsoft Academic Search

This paper provides a survey of state-of-the-art hardware architectures for image and video coding. Fundamental design issues are discussed with particular emphasis on efficient dedicated implementation. Hardware architectures for MPEG-4 video coding and JPEG 2000 still image coding are reviewed as design examples, and special approaches exploited to improve efficiency are identified. Further perspectives are also presented to address the

Po-chih Tseng; Yung-chi Chang; Yu-wen Huang; Hung-chi Fang; Chao-tsung Huang; Liang-gee Chen

2005-01-01

84

The H.264/AVC advanced video coding standard: overview and introduction to the fidelity range extensions  

NASA Astrophysics Data System (ADS)

H.264/MPEG-4 AVC is the latest international video coding standard. It was jointly developed by the Video Coding Experts Group (VCEG) of the ITU-T and the Moving Picture Experts Group (MPEG) of ISO/IEC. It uses state-of-the-art coding tools and provides enhanced coding efficiency for a wide range of applications, including video telephony, video conferencing, TV, storage (DVD and/or hard disk based, especially high-definition DVD), streaming video, digital video authoring, digital cinema, and many others. The work on a new set of extensions to this standard has recently been completed. These extensions, known as the Fidelity Range Extensions (FRExt), provide a number of enhanced capabilities relative to the base specification as approved in the Spring of 2003. In this paper, an overview of this standard is provided, including the highlights of the capabilities of the new FRExt features. Some comparisons with the existing MPEG-2 and MPEG-4 Part 2 standards are also provided.

Sullivan, Gary J.; Topiwala, Pankaj N.; Luthra, Ajay

2004-11-01

85

Three-dimensional hybrid grid generation using advancing front techniques  

NASA Technical Reports Server (NTRS)

A new 3-dimensional hybrid grid generation technique has been developed, based on ideas of advancing fronts for both structured and unstructured grids. In this approach, structured grids are first generate independently around individual components of the geometry. Fronts are initialized on these structure grids, and advanced outward so that new cells are extracted directly from the structured grids. Employing typical advancing front techniques, cells are rejected if they intersect the existing front or fail other criteria When no more viable structured cells exist further cells are advanced in an unstructured manner to close off the overall domain, resulting in a grid of 'hybrid' form. There are two primary advantages to the hybrid formulation. First, generating blocks with limited regard to topology eliminates the bottleneck encountered when a multiple block system is used to fully encapsulate a domain. Individual blocks may be generated free of external constraints, which will significantly reduce the generation time. Secondly, grid points near the body (presumably with high aspect ratio) will still maintain a structured (non-triangular or tetrahedral) character, thereby maximizing grid quality and solution accuracy near the surface.

Steinbrenner, John P.; Noack, Ralph W.

1995-01-01

86

Testing to Characterize the Advanced Stirling Radioisotope Generator Engineering Unit  

NASA Technical Reports Server (NTRS)

The Advanced Stirling Radioisotope Generator (ASRG), a high efficiency generator, is being considered for space missions. Lockheed Martin designed and fabricated an engineering unit (EU), the ASRG EU, under contract to the Department of Energy. This unit is currently undergoing extended operation testing at the NASA Glenn Research Center to generate performance data and validate life and reliability predictions for the generator and the Stirling convertors. It has also undergone performance tests to characterize generator operation while varying control parameters and system inputs. This paper summarizes and explains test results in the context of designing operating strategies for the generator during a space mission and notes expected differences between the EU performance and future generators.

Lewandowski, Edward; Schreiber, Jeffrey

2010-01-01

87

Advances in understanding cancer genomes through second-generation sequencing  

Microsoft Academic Search

Cancers are caused by the accumulation of genomic alterations. Therefore, analyses of cancer genome sequences and structures provide insights for understanding cancer biology, diagnosis and therapy. The application of second-generation DNA sequencing technologies (also known as next-generation sequencing) — through whole-genome, whole-exome and whole-transcriptome approaches — is allowing substantial advances in cancer genomics. These methods are facilitating an increase in

Stacey Gabriel; Gad Getz; Matthew Meyerson

2010-01-01

88

Advanced instrumentation for next-generation aerospace propulsion control systems  

NASA Technical Reports Server (NTRS)

New control concepts for the next generation of advanced air-breathing and rocket engines and hypersonic combined-cycle propulsion systems are analyzed. The analysis provides a database on the instrumentation technologies for advanced control systems and cross matches the available technologies for each type of engine to the control needs and applications of the other two types of engines. Measurement technologies that are considered to be ready for implementation include optical surface temperature sensors, an isotope wear detector, a brushless torquemeter, a fiberoptic deflectometer, an optical absorption leak detector, the nonintrusive speed sensor, and an ultrasonic triducer. It is concluded that all 30 advanced instrumentation technologies considered can be recommended for further development to meet need of the next generation of jet-, rocket-, and hypersonic-engine control systems.

Barkhoudarian, S.; Cross, G. S.; Lorenzo, Carl F.

1993-01-01

89

Design features of Advanced Power Reactor (APR) 1400 steam generator  

Microsoft Academic Search

Advanced Power Reactor 1400 (APR 1400) which is to achieve the improvement of the safety and economical efficiency has been developed by Korea Hydro and Nuclear Power Co., Ltd. (KHNP) with the support from industries and research institutes. The steam generator for APR 1400 is an evolutionary type from System 80{sup +}, which is the recirculating U-tube heat exchanger with

Tae-Jung Park; Jun-Soo Park; Moo-Yong Kim

2004-01-01

90

Video Analysis Tools for Annotating User-Generated Content from Social Events  

Microsoft Academic Search

In this demo we present how low-level metadata extraction tools have been applied in the context of a pan-European project called Together Anywhere, Together Anytime (TA2). The TA2 project studies new forms of computer-mediated social communications between spatially and temporally distant people. In particular, we concentrate on automatic video analysis tools in an asynchronous community-based video sharing environment called MyVideos,

R. L. Guimarães; R. Kaiser; A. Hofmann; P. S. César Garcia; D. C. A. Bulterman

2010-01-01

91

Energy Efficient Delivery Methods for Video-Rich Services over Next Generation Broadband Access Networks  

Microsoft Academic Search

We present energy consumption models of video-on- demand (VoD) services delivered through newly proposed localized hybrid peer-to-peer (HP2P) and localized peer-assisted patching (PAP) with multicast video delivery methods over optical access networks. In this paper, we demonstrate through simulations that the localized PAP with multicast video delivery method consumes the lowest network transport energy for popular VoD channels while localized

Chien Aun Chan; Elaine Wong; Ampalavanapillai Nirmalathas; Chamil Jayasundara

2011-01-01

92

The Effects of Technological Advancement and Violent Content in Video Games on Players? Feelings of Presence, Involvement, Physiological Arousal, and Aggression  

Microsoft Academic Search

The possible impact of technological advancement on video games' effects—particularly in the case of violent games—has often been discussed but has not been thoroughly explored by empirical research. The present investigation employed a 2 3 2 between- subjects factorial experiment to examine the interplay of technological advancement and violence by exposing participants (N = 120) to either a newer or

James D. Ivory; Sriram Kalyanaraman

2007-01-01

93

Advanced Research Projects Agency-Energy: Presentations (Video) from the 2012 Innovation Summit  

DOE Data Explorer

Scroll down the page to view videoed presentations from the 2012 Innovation Summit hosted by DOE's ARPA-E. Speakers included former President Bill Clinton, Bill Gates, Secretary of Energy Steven Chu, and the ARPA-E Director, Dr. Arun Majumdar.

94

Advances in low-power visible/thermal IR video image fusion hardware  

NASA Astrophysics Data System (ADS)

Equinox Corporation has developed two new video board products for real-time image fusion of visible (or intensified visible/near-infrared) and thermal (emissive) infrared video. These products can provide unique capabilities to the dismounted soldier, maritime/naval operations and Unmanned Aerial Vehicles (UAVs) with low-power, lightweight, compact and inexpensive FPGA video fusion hardware. For several years Equinox Corporation has been studying and developing image fusion methodologies using the complementary modalities of the visible and thermal infrared wavebands including applications to face recognition, tracking, sensor development and fused image visualization. The video board products incorporate Equinox's proprietary image fusion algorithms into an FPGA architecture with embedded programmable capability. Currently included are (1) user interactive image fusion algorithms that go significantly beyond standard "A+B" fusion providing an intuitive color visualization invariant to distracting illumination changes, (2) generalized image co-registration to compensate for parallax, scale and rotation differences between visible/intensified and thermal IR, as well as non-linear optical and display distortion, and (3) automatic gain control (AGC) for dynamic range adaptation.

Wolff, Lawrence B.; Socolinsky, Diego A.; Eveland, Christopher K.; Reese, C. E.; Bender, E. J.; Wood, M. V.

2005-03-01

95

Generation of a restored image from a video sequence recorded under turbulence effects  

Microsoft Academic Search

Turbulence conditions affect video images in two ways. They cause local blur, and they distort the geometry of the scene. A video sequence of a still scene recorded under turbulence appears to contain local random motion of small neighborhoods in the images. The blur is an accumulated result of the imaging point spread function and the local motion. The geometric

Boaz Cohen; Vadim Avrin; Moshe Belitsky; Its'hak Dinstein

1997-01-01

96

Bringing Evolution to a Technological Generation: A Case Study with the Video Game SPORE  

ERIC Educational Resources Information Center

The video game SPORE was found to hold characteristics that stimulate higher-order thinking even though it rated poorly for accurate science. Interested in evaluating whether a scientifically inaccurate video game could be used effectively, we exposed students to SPORE during an evolution course. Students that played the game reported that they…

Poli, DorothyBelle; Berenotto, Christopher; Blankenship, Sara; Piatkowski, Bryan; Bader, Geoffrey A.; Poore, Mark

2012-01-01

97

Enhanced Human Body Fall Detection Utilizing Advanced Classification of Video and Motion Perceptual Components  

Microsoft Academic Search

The monitoring of human physiological data, in both normal and abnormal situations of activity, is interesting for the purpose\\u000a of emergency event detection, especially in the case of elderly people living on their own. Several techniques have been proposed\\u000a for identifying such distress situations using either motion, audio or video data from the monitored subject and the surrounding\\u000a environment. This

Charalampos Doukas; Ilias Maglogiannis

2009-01-01

98

Advanced Research Projects Agency - Energy: Presentations (Video) from the 2013 Innovation Summit  

DOE Data Explorer

Videoed presentations from the 2013 Innovation Summit hosted by DOE's ARPA-E. Keynote speakers were noted businessman and BP founder T. Boone Pickens, General James L. Jones, DuPont CEO Ellen Kullman, Purdue University President Mitch Daniels, DARPA Director Arati Prabhakar, NYC Mayor Michael Bloomberg, Secretary of Energy Steven Chu, global change expert Dr. Hans Rosling, and ARPA-E Deputy Director Cheryl Martin.

99

BIOMASS GASIFICATION AND POWER GENERATION USING ADVANCED GAS TURBINE SYSTEMS  

SciTech Connect

A multidisciplined team led by the United Technologies Research Center (UTRC) and consisting of Pratt & Whitney Power Systems (PWPS), the University of North Dakota Energy & Environmental Research Center (EERC), KraftWork Systems, Inc. (kWS), and the Connecticut Resource Recovery Authority (CRRA) has evaluated a variety of gasified biomass fuels, integrated into advanced gas turbine-based power systems. The team has concluded that a biomass integrated gasification combined-cycle (BIGCC) plant with an overall integrated system efficiency of 45% (HHV) at emission levels of less than half of New Source Performance Standards (NSPS) is technically and economically feasible. The higher process efficiency in itself reduces consumption of premium fuels currently used for power generation including those from foreign sources. In addition, the advanced gasification process can be used to generate fuels and chemicals, such as low-cost hydrogen and syngas for chemical synthesis, as well as baseload power. The conceptual design of the plant consists of an air-blown circulating fluidized-bed Advanced Transport Gasifier and a PWPS FT8 TwinPac{trademark} aeroderivative gas turbine operated in combined cycle to produce {approx}80 MWe. This system uses advanced technology commercial products in combination with components in advanced development or demonstration stages, thereby maximizing the opportunity for early implementation. The biofueled power system was found to have a levelized cost of electricity competitive with other new power system alternatives including larger scale natural gas combined cycles. The key elements are: (1) An Advanced Transport Gasifier (ATG) circulating fluid-bed gasifier having wide fuel flexibility and high gasification efficiency; (2) An FT8 TwinPac{trademark}-based combined cycle of approximately 80 MWe; (3) Sustainable biomass primary fuel source at low cost and potentially widespread availability-refuse-derived fuel (RDF); (4) An overall integrated system that exceeds the U.S. Department of Energy (DOE) goal of 40% (HHV) efficiency at emission levels well below the DOE suggested limits; and (5) An advanced biofueled power system whose levelized cost of electricity can be competitive with other new power system alternatives.

David Liscinsky

2002-10-20

100

3D video surveillance with Augmented Virtual Environments  

Microsoft Academic Search

Recent advances in sensing and computing technologies have inspired a new generation of data analysis and visualization systems for video surveillance applications. We present a novel visualization system for video surveillance based on an Augmented Virtual Environment (AVE) that fuses dynamic imagery with 3D models in a real-time display to help observers comprehend multiple streams of temporal data and imagery

Ismail Oner Sebe; Jinhui Hu; Suya You; Ulrich Neumann

2003-01-01

101

SECOND GENERATION ADVANCED REBURNING FOR HIGH EFFICIENCY NOx CONTROL  

SciTech Connect

This project is designed to develop a family of novel NO{sub x} control technologies, called Second Generation Advanced Reburning which has the potential to achieve 90+ NO{sub x} control in coal fired boilers at a significantly lower cost than Selective Catalytic Reduction. The eighth reporting period in Phase II (July 1--September 26, 1999) included combined chemistry-mixing modeling on advanced gas reburning and experimental activities in support of modeling. Modeling efforts focused on description of AR-Lean--combination of basic reburning and co-injection of N-agent with overfire air. Modeling suggests that efficiency of AR-Lean strongly depends on the amount of the reburning fuel, temperature of flue gas at the point of OFA/N-agent injection, and evaporation time of N-agent. The model describes the most important features of AR-Lean and can be used for AR-Lean optimization.

Vladimir M. Zamansky; Peter M. Maly; Vitali V. Lissianski

1999-10-29

102

GRC Supporting Technology for NASA's Advanced Stirling Radioisotope Generator (ASRG)  

NASA Technical Reports Server (NTRS)

From 1999 to 2006, the NASA Glenn Research Center (GRC) supported a NASA project to develop a high-efficiency, nominal 110-We Stirling Radioisotope Generator (SRG110) for potential use on NASA missions. Lockheed Martin was selected as the System Integration Contractor for the SRG110, under contract to the Department of Energy (DOE). The potential applications included deep space missions, and Mars rovers. The project was redirected in 2006 to make use of the Advanced Stirling Convertor (ASC) that was being developed by Sunpower, Inc. under contract to GRC, which would reduce the mass of the generator and increase the power output. This change would approximately double the specific power and result in the Advanced Stirling Radioisotope Generator (ASRG). The SRG110 supporting technology effort at GRC was replanned to support the integration of the Sunpower convertor and the ASRG. This paper describes the ASRG supporting technology effort at GRC and provides details of the contributions in some of the key areas. The GRC tasks include convertor extended-operation testing in air and in thermal vacuum environments, heater head life assessment, materials studies, permanent magnet characterization and aging tests, structural dynamics testing, electromagnetic interference and electromagnetic compatibility characterization, evaluation of organic materials, reliability studies, and analysis to support controller development.

Schreiber, Jeffrey G.; Thieme, Lanny G.

2008-01-01

103

Advanced ceramic materials for next-generation nuclear applications  

NASA Astrophysics Data System (ADS)

The nuclear industry is at the eye of a 'perfect storm' with fuel oil and natural gas prices near record highs, worldwide energy demands increasing at an alarming rate, and increased concerns about greenhouse gas (GHG) emissions that have caused many to look negatively at long-term use of fossil fuels. This convergence of factors has led to a growing interest in revitalization of the nuclear power industry within the United States and across the globe. Many are surprised to learn that nuclear power provides approximately 20% of the electrical power in the US and approximately 16% of the world-wide electric power. With the above factors in mind, world-wide over 130 new reactor projects are being considered with approximately 25 new permit applications in the US. Materials have long played a very important role in the nuclear industry with applications throughout the entire fuel cycle; from fuel fabrication to waste stabilization. As the international community begins to look at advanced reactor systems and fuel cycles that minimize waste and increase proliferation resistance, materials will play an even larger role. Many of the advanced reactor concepts being evaluated operate at high-temperature requiring the use of durable, heat-resistant materials. Advanced metallic and ceramic fuels are being investigated for a variety of Generation IV reactor concepts. These include the traditional TRISO-coated particles, advanced alloy fuels for 'deep-burn' applications, as well as advanced inert-matrix fuels. In order to minimize wastes and legacy materials, a number of fuel reprocessing operations are being investigated. Advanced materials continue to provide a vital contribution in 'closing the fuel cycle' by stabilization of associated low-level and high-level wastes in highly durable cements, ceramics, and glasses. Beyond this fission energy application, fusion energy will demand advanced materials capable of withstanding the extreme environments of high-temperature plasma systems. Fusion reactors will likely depend on lithium-based ceramics to produce tritium that fuels the fusion plasma, while high-temperature alloys or ceramics will contain and control the hot plasma. All the while, alloys, ceramics, and ceramic-related processes continue to find applications in the management of wastes and byproducts produced by these processes.

Marra, John

2011-10-01

104

Development of Advanced Stirling Radioisotope Generator for Space Exploration  

NASA Technical Reports Server (NTRS)

Under the joint sponsorship of the Department of Energy and NASA, a radioisotope power system utilizing Stirling power conversion technology is being developed for potential future space missions. The higher conversion efficiency of the Stirling cycle compared with that of Radioisotope Thermoelectric Generators (RTGs) used in previous missions (Viking, Pioneer, Voyager, Galileo, Ulysses, Cassini, and New Horizons) offers the advantage of a four-fold reduction in PuO2 fuel, thereby saving cost and reducing radiation exposure to support personnel. With the advancement of state-of-the-art Stirling technology development under the NASA Research Announcement (NRA) project, the Stirling Radioisotope Generator program has evolved to incorporate the advanced Stirling convertor (ASC), provided by Sunpower, into an engineering unit. Due to the reduced envelope and lighter mass of the ASC compared to the previous Stirling convertor, the specific power of the flight generator is projected to increase from 3.5 to 7 We/kg, along with a 25 percent reduction in generator length. Modifications are being made to the ASC design to incorporate features for thermal, mechanical, and electrical integration with the engineering unit. These include the heat collector for hot end interface, cold-side flange for waste heat removal and structural attachment, and piston position sensor for ASC control and power factor correction. A single-fault tolerant, active power factor correction controller is used to synchronize the Stirling convertors, condition the electrical power from AC to DC, and to control the ASCs to maintain operation within temperature and piston stroke limits. Development activities at Sunpower and NASA Glenn Research Center (GRC) are also being conducted on the ASC to demonstrate the capability for long life, high reliability, and flight qualification needed for use in future missions.

Chan, Jack; Wood, J. Gary; Schreiber, Jeffrey G.

2007-01-01

105

Advanced visualization platform for surgical operating room coordination: distributed video board system.  

PubMed

One of the major challenges for day-of-surgery operating room coordination is accurate and timely situation awareness. Distributed and secure real-time status information is key to addressing these challenges. This article reports on the design and implementation of a passive status monitoring system in a 19-room surgical suite of a major academic medical center. Key design requirements considered included integrated real-time operating room status display, access control, security, and network impact. The system used live operating room video images and patient vital signs obtained through monitors to automatically update events and operating room status. Images were presented on a "need-to-know" basis, and access was controlled by identification badge authorization. The system delivered reliable real-time operating room images and status with acceptable network impact. Operating room status was visualized at 4 separate locations and was used continuously by clinicians and operating room service providers to coordinate operating room activities. PMID:17012154

Hu, Peter F; Xiao, Yan; Ho, Danny; Mackenzie, Colin F; Hu, Hao; Voigt, Roger; Martz, Douglas

2006-06-01

106

Advancing the Next Generation of Health Risk Assessment  

PubMed Central

Background: Over the past 20 years, knowledge of the genome and its function has increased dramatically, but risk assessment methodologies using such knowledge have not advanced accordingly. Objective: This commentary describes a collaborative effort among several federal and state agencies to advance the next generation of risk assessment. The objective of the NexGen program is to begin to incorporate recent progress in molecular and systems biology into risk assessment practice. The ultimate success of this program will be based on the incorporation of new practices that facilitate faster, cheaper, and/or more accurate assessments of public health risks. Methods: We are developing prototype risk assessments that compare the results of traditional, data-rich risk assessments with insights gained from new types of molecular and systems biology data. In this manner, new approaches can be validated, traditional approaches improved, and the value of different types of new scientific information better understood. Discussion and Conclusions: We anticipate that these new approaches will have a variety of applications, such as assessment of new and existing chemicals in commerce and the design of chemical products and processes that reduce or eliminate the use or generation of hazardous substances. Additionally, results of the effort are likely to spur further research and test methods development. Full implementation of new approaches is likely to take 10–20 years.

Anastas, Paul T.; Birnbaum, Linda S.; Clark, Rebecca M.; Dix, David J.; Edwards, Stephen W.; Preuss, Peter W.

2012-01-01

107

Advanced optical components for next-generation photonic networks  

NASA Astrophysics Data System (ADS)

Future networks will require very high throughput, carrying dominantly data-centric traffic. The role of Photonic Networks employing all-optical systems will become increasingly important in providing scalable bandwidth, agile reconfigurability, and low-power consumptions in the future. In particular, the self-similar nature of data traffic indicates that packet switching and burst switching will be beneficial in the Next Generation Photonic Networks. While the natural conclusion is to pursue Photonic Packet Switching and Photonic Burst Switching systems, there are significant challenges in realizing such a system due to practical limitations in optical component technologies. Lack of a viable all-optical memory technology will continue to drive us towards exploring rapid reconfigurability in the wavelength domain. We will introduce and discuss the advanced optical component technologies behind the Photonic Packet Routing system designed and demonstrated at UC Davis. The system is capable of packet switching and burst switching, as well as circuit switching with 600 psec switching speed and scalability to 42 petabit/sec aggregated switching capacity. By utilizing a combination of rapidly tunable wavelength conversion and a uniform-loss cyclic frequency (ULCF) arrayed waveguide grating router (AWGR), the system is capable of rapidly switching the packets in wavelength, time, and space domains. The label swapping module inside the Photonic Packet Routing system containing a Mach-Zehnder wavelength converter and a narrow-band fiber Bragg-grating achieves all-optical label swapping with optical 2R (potentially 3R) regeneration while maintaining optical transparency for the data payload. By utilizing the advanced optical component technologies, the Photonic Packet Routing system successfully demonstrated error-free, cascaded, multi-hop photonic packet switching and routing with optical-label swapping. This paper will review the advanced optical component technologies and their role in the Next Generation Photonic Networks.

Yoo, S. J. B.

2003-08-01

108

Authentic Integration of Video Technology To Reinforce the National Science Education Standards in Advanced Placement Science Classes in Low Socio-Economic Schools.  

ERIC Educational Resources Information Center

This report discusses a proposed research project to study the integration of video technology to reinforce the National Science Education Standards in Advanced Placement (AP) classes in low socio-economic schools in Indiana. The report begins with overviews of AP in Indiana, the National Science Education Standards, and research relevant to the…

Myers, Mark D.

109

Next Generation Preschool Math: Can video-based PD work? (re: Math Talk)  

NSDL National Science Digital Library

As part of its NSF-funded research, the NGPM project is exploring the use of PD videos such as these, which focus on the role of math talk in preschool classrooms. The four brief clips (3-5 min. each) in this blog entry show teachers discussing the nature and importance of math talk and demonstrating how they promote it with their students.

2013-08-22

110

Finite element model of the human head exposed to electrostatic field generated by Video Display Units  

Microsoft Academic Search

The goal of this paper is to investigate interaction between electrostatic field of video display units (VDU's) and human head in front of it. Special attention is given to the field at the surface of the face. The finite element model for assessment of the electrostatic field, by solving Laplace equation for the electric potential, is implemented. The electrostatic field

Damir Cavka; Dragan Poljak; Andres Peratta

2006-01-01

111

Design features of Advanced Power Reactor (APR) 1400 steam generator  

SciTech Connect

Advanced Power Reactor 1400 (APR 1400) which is to achieve the improvement of the safety and economical efficiency has been developed by Korea Hydro and Nuclear Power Co., Ltd. (KHNP) with the support from industries and research institutes. The steam generator for APR 1400 is an evolutionary type from System 80{sup +}, which is the recirculating U-tube heat exchanger with integral economizer. Compared to the System 80{sup +} steam generator, it is focused on the improved design features, operating and design conditions of APR 1400 steam generator. Especially, from the operation experience of Korean Standard Nuclear Power Plant (KSNP) steam generator, the lessons-learned measures are incorporated to prevent the tube wear caused by flow-induced vibration (FIV). The concepts for the preventive design features against FIV are categorized to two fields; flow distribution and dynamic response characteristics. From the standpoint of flow distribution characteristics, the egg-crate flow distribution plate (EFDP) is installed to prevent the local excessive flow loaded on the most susceptible tube to wear. The parametric study is performed to select the optimum design with the efficient mitigation of local excessive flow. ATHOS3 Mod-01 is used and partly modified to analyze the flow field of the APR 1400 steam generator. In addition, the upper tube bundle support is designed to eliminate the presence of tube with a low natural frequency. Based on the improved upper tube bundle support, the modal analysis is performed and compared with that of System 80{sup +}. Using the results of flow distribution and modal analysis, the two mechanisms of flow-induced vibration are investigated; fluid-elastic instability (FEI) and random turbulence excitation (RTE). (authors)

Park, Tae-Jung; Park, Jun-Soo; Kim, Moo-Yong [DOOSAN Heavy Industries and Construction Co. LTD, 555 Guygok-Dong, Changwon, Gyeongnam, 641-792 (Korea, Republic of)

2004-07-01

112

Advanced numerical methods in mesh generation and mesh adaptation  

SciTech Connect

Numerical solution of partial differential equations requires appropriate meshes, efficient solvers and robust and reliable error estimates. Generation of high-quality meshes for complex engineering models is a non-trivial task. This task is made more difficult when the mesh has to be adapted to a problem solution. This article is focused on a synergistic approach to the mesh generation and mesh adaptation, where best properties of various mesh generation methods are combined to build efficiently simplicial meshes. First, the advancing front technique (AFT) is combined with the incremental Delaunay triangulation (DT) to build an initial mesh. Second, the metric-based mesh adaptation (MBA) method is employed to improve quality of the generated mesh and/or to adapt it to a problem solution. We demonstrate with numerical experiments that combination of all three methods is required for robust meshing of complex engineering models. The key to successful mesh generation is the high-quality of the triangles in the initial front. We use a black-box technique to improve surface meshes exported from an unattainable CAD system. The initial surface mesh is refined into a shape-regular triangulation which approximates the boundary with the same accuracy as the CAD mesh. The DT method adds robustness to the AFT. The resulting mesh is topologically correct but may contain a few slivers. The MBA uses seven local operations to modify the mesh topology. It improves significantly the mesh quality. The MBA method is also used to adapt the mesh to a problem solution to minimize computational resources required for solving the problem. The MBA has a solid theoretical background. In the first two experiments, we consider the convection-diffusion and elasticity problems. We demonstrate the optimal reduction rate of the discretization error on a sequence of adaptive strongly anisotropic meshes. The key element of the MBA method is construction of a tensor metric from hierarchical edge-based error estimates. We conclude that the quasi-optimal mesh must be quasi-uniform in this metric. All numerical experiments are based on the publicly available Ani3D package, the collection of advanced numerical instruments.

Lipnikov, Konstantine [Los Alamos National Laboratory; Danilov, A [MOSCOW, RUSSIA; Vassilevski, Y [MOSCOW, RUSSIA; Agonzal, A [UNIV OF LYON

2010-01-01

113

Investigation of advancing front method for generating unstructured grid  

NASA Technical Reports Server (NTRS)

The advancing front technique is used to generate an unstructured grid about simple aerodynamic geometries. Unstructured grids are generated using VGRID2D and VGRID3D software. Specific problems considered are a NACA 0012 airfoil, a bi-plane consisting of two NACA 0012 airfoil, a four element airfoil in its landing configuration, and an ONERA M6 wing. Inviscid time dependent solutions are computed on these geometries using USM3D and the results are compared with standard test results obtained by other investigators. A grid convergence study is conducted for the NACA 0012 airfoil and compared with a structured grid. A structured grid is generated using GRIDGEN software and inviscid solutions computed using CFL3D flow solver. The results obtained by unstructured grid for NACA 0012 airfoil showed an asymmetric distribution of flow quantities, and a fine distribution of grid was required to remove this asymmetry. On the other hand, the structured grid predicted a very symmetric distribution, but when the total number of points were compared to obtain the same results it was seen that structured grid required more grid points.

Thomas, A. M.; Tiwari, S. N.

1992-01-01

114

Studies on advanced water-cooled reactors beyond generation III for power generation  

Microsoft Academic Search

China’s ambitious nuclear power program motivates the country’s nuclear community to develop advanced reactor concepts beyond\\u000a generation III to ensure a long-term, stable, and sustainable development of nuclear power. The paper discusses some main\\u000a criteria for the selection of future water-cooled reactors by considering the specific Chinese situation. Based on the suggested\\u000a selection criteria, two new types of water-cooled reactors

Xu Cheng

2007-01-01

115

Second Generation Advanced Reburning for High Efficiency NOx Control  

SciTech Connect

This project is designed to develop a family of novel NO{sub x} control technologies, called Second Generation Advanced Reburning (SGAR) which has the potential to achieve 90+% NO{sub x} control in coal-fired boilers at a significantly lower cost than SCR. The thirteenth reporting period in Phase II (October 1-December 31, 2000) included SGAR tests in which coal was used as the reburning fuel. All test work was conducted at GE-EER's 1.0 MMBtu/hr Boiler Simulator Facility. Three test series were performed including AR-Lean, AR-Rich, and reburning + SNCR. Tests demonstrated that over 90% NO{sub x} reduction could be achieved with utilization of coal as a reburning fuel in SGAR. The most effective SGAR variant is reburning + SNCR followed by AR-Lean and AR-Rich.

Vladimir M. Zamansky; Pete M. Maly; Vitali V. Lissianski

2000-12-31

116

Second Generation Advanced Reburning for High Efficiency NOx Control  

SciTech Connect

This project is designed to develop a family of novel NO{sub x} control technologies, called Second Generation Advanced Reburning (SGAR) which has the potential to achieve 90+ NO{sub x} control in coal-fired boilers at a significantly lower cost than SCR. The eleventh reporting period in Phase II (April 1-June 30, 2000) included design validation AR-Lean tests (Task 2.6) in the 10 x 10{sup 6} Btu/hr Tower Furnace. The objective of tests was to determine the efficiency of AR-Lean at higher than optimum OFA/N-Agent injection temperatures in large pilot-scale combustion facility. Tests demonstrated that co-injection of urea with overfire air resulted in NO{sub x} reduction. However, observed NO{sub x} reduction was smaller than that under optimum conditions.

Vladimir Zamansky

2000-06-30

117

Silicon carbide: an advanced platform for next generation quantum devices  

NASA Astrophysics Data System (ADS)

Optical and paramagnetic deep defects in silicon carbide (SiC) offer a vast opportunity to realize advanced quantum device and sensors based on SiC bulk material and SiC nanostructures. Nanostructures in silicon carbide such as nanoparticle and quantum dots possess strong sub-bandgap emission due to both quantum confinement and radiative recombination in deep defects, making them ideal as bio-markers. We will highlight silicon carbide extremely rich underlying resources, ideal for the implementation of next generation nanophotonics and spintronics quantum devices and related biomedical applications. Specifically, we show here the isolation of intrinsic defects in SiC achieved by electron irradiation of the material, yielding single photon emission.

Castelletto, S.; Johnson, B. C.; Parker, A.

2013-09-01

118

Second Generation Advanced Reburning for High Efficiency NOx Control  

SciTech Connect

This project is designed to develop a family of novel NO{sub x} control technologies, called Second Generation Advanced Reburning (SGAR) which has the potential to achieve 90+ NO{sub x} control in coal fired boilers at a significantly lower cost than Selective Catalytic Reduction. The ninth reporting period in Phase II (October 1-December 31, 1999) included preparation of the 10 x 10{sup 6} Btu/hr Tower Furnace for tests and setting the SGAR model to predict process performance under Tower Furnace conditions. Based on results of previous work, a paper has been prepared and submitted for the presentation at the 28 Symposium (International) on Combustion to be held at the University of Edinburgh, Scotland.

Vladimir M. Zamansky; Vitali V. Lissianski

1999-12-31

119

An advanced control system for a next generation transport aircraft  

NASA Technical Reports Server (NTRS)

The use of modern control theory to develop a high-authority stability and control system for the next generation transport aircraft is described with examples taken from work performed on an advanced pitch active control system (PACS). The PACS was configured to have short-period and phugoid modes frequency and damping characteristics within the shaded S-plane areas, column force gradients with set bounds and with constant slope, and a blended normal-acceleration/pitch rate time history response to a step command. Details of the control law, feedback loop, and modal control syntheses are explored, as are compensation for the feedback gain, the deletion of the velocity signal, and the feed-forward compensation. Scheduling of the primary and secondary gains are discussed, together with control law mechanization, flying qualities analyses, and application on the L-1011 aircraft.

Rising, J. J.; Davis, W. J; Grantham, W. D.

1983-01-01

120

Reliability Demonstration Approach for Advanced Stirling Radioisotope Generator  

NASA Technical Reports Server (NTRS)

Developed for future space missions as a high-efficiency power system, the Advanced Stirling Radioisotope Generator (ASRG) has a design life requirement of 14 yr in space following a potential storage of 3 yr after fueling. In general, the demonstration of long-life dynamic systems remains difficult in part due to the perception that the wearout of moving parts cannot be minimized, and associated failures are unpredictable. This paper shows a combination of systematic analytical methods, extensive experience gained from technology development, and well-planned tests can be used to ensure a high level reliability of ASRG. With this approach, all potential risks from each life phase of the system are evaluated and the mitigation adequately addressed. This paper also provides a summary of important test results obtained to date for ASRG and the planned effort for system-level extended operation.

Ha, CHuong; Zampino, Edward; Penswick, Barry; Spronz, Michael

2010-01-01

121

Robust and Rapid Generation of Animated Faces from Video Images: A Model-Based Modeling Approach  

Microsoft Academic Search

We have developed an easy-to-use and cost-effective system to construct textured 3D animated face models from videos with minimal user interaction. This is a particularly challenging task for faces due to a lack of prominent textures. We develop a robust system by following a model- based approach: we make full use of generic knowledge of faces in head motion determination,

Zhengyou Zhang; Zi-cheng Liu; Dennis Adler; Erik Hanson; Ying Shan

2004-01-01

122

Fast generation of CGH of 3D video images by using block-based motion compensation techniques  

NASA Astrophysics Data System (ADS)

A new approach for fast generation of computer-generated-holograms (CGHs) by combined use of the N-LUT method and block matching motion compensation technique is proposed. Here, we apply block matching-based motion compensation algorithm to N-LUT-based CGH generation method by which a higher similarity between adjacent frames can be obtained. In the proposed method, the input video images are divided into blocks of fixed size and the CGHs of every block in reference frames are pre-calculated with the N-LUT method. The motion vectors of every block in the reference frame are extracted between reference frame and current frame, and a compensated frame image can be obtained by shifting every block's position according to the motion vectors. Through this process, 3-D objects data to be calculated for its video holograms are dramatically reduced leading to the greater reduction of the calculation time compared with the conventional temporal redundancy-based N-LUT (TR-N-LUT) method. The experiments have found that the average number of calculated object points for one frame and the average calculation time for one object point of the proposed method are reduced by 30.05% and 21.23% respectively compared to those with the conventional TRNLUT method.

Dong, Xiao-Bin; Kim, Seung-Cheol; Kim, Eun-Soo

2014-02-01

123

Generation of a restored image from a video sequence recorded under turbulence effects  

NASA Astrophysics Data System (ADS)

Turbulence conditions affect video images in two ways. They cause local blur, and they distort the geometry of the scene. A video sequence of a still scene recorded under turbulence appears to contain local random motion of small neighborhoods in the images. The blur is an accumulated result of the imaging point spread function and the local motion. The geometric distortion is due to the fact that small neighborhoods move in different directions. The restoration scheme reported takes care of the geometric distortion as well as the blur. The geometric distortion is reduced by averaging the gray levels of relatively long (a few hundred images) video segments. The averaging reduces the geometric distortion, but it increases the blur. The second stage is the estimation of the global point spread function. The blur in the average image is a combination of the effects of the imaging system transfer function, the turbulence, and the averaging of the sequence. The global nonisotropic point spread function is estimated based on edge responses in the average image. A Wiener filter is used for the restoration of the image. The presented experimental results are superior to the results obtained by a previously proposed majority-vote technique.

Cohen, Boaz; Avrin, Vadim; Belitsky, Moshe; Dinstein, Its'hak

1997-12-01

124

Video Golf  

NASA Technical Reports Server (NTRS)

George Nauck of ENCORE!!! invented and markets the Advanced Range Performance (ARPM) Video Golf System for measuring the result of a golf swing. After Nauck requested their assistance, Marshall Space Flight Center scientists suggested video and image processing/computing technology, and provided leads on commercial companies that dealt with the pertinent technologies. Nauck contracted with Applied Research Inc. to develop a prototype. The system employs an elevated camera, which sits behind the tee and follows the flight of the ball down range, catching the point of impact and subsequent roll. Instant replay of the video on a PC monitor at the tee allows measurement of the carry and roll. The unit measures distance and deviation from the target line, as well as distance from the target when one is selected. The information serves as an immediate basis for making adjustments or as a record of skill level progress for golfers.

1995-01-01

125

Toxicogenomics and cancer susceptibility: advances with next-generation sequencing.  

PubMed

The aim of this review is to comprehensively summarize the recent achievements in the field of toxicogenomics and cancer research regarding genetic-environmental interactions in carcinogenesis and detection of genetic aberrations in cancer genomes by next-generation sequencing technology. Cancer is primarily a genetic disease in which genetic factors and environmental stimuli interact to cause genetic and epigenetic aberrations in human cells. Mutations in the germline act as either high-penetrance alleles that strongly increase the risk of cancer development, or as low-penetrance alleles that mildly change an individual's susceptibility to cancer. Somatic mutations, resulting from either DNA damage induced by exposure to environmental mutagens or from spontaneous errors in DNA replication or repair are involved in the development or progression of the cancer. Induced or spontaneous changes in the epigenome may also drive carcinogenesis. Advances in next-generation sequencing technology provide us opportunities to accurately, economically, and rapidly identify genetic variants, somatic mutations, gene expression profiles, and epigenetic alterations with single-base resolution. Whole genome sequencing, whole exome sequencing, and RNA sequencing of paired cancer and adjacent normal tissue present a comprehensive picture of the cancer genome. These new findings should benefit public health by providing insights in understanding cancer biology, and in improving cancer diagnosis and therapy. PMID:24875441

Ning, Baitang; Su, Zhenqiang; Mei, Nan; Hong, Huixiao; Deng, Helen; Shi, Leming; Fuscoe, James C; Tolleson, William H

2014-04-01

126

The ALS (Advanced Light Source): A third generation light source  

SciTech Connect

The Advanced Light Source, a third-generation national synchrotron-radiation facility now under construction at the Lawrence Berkeley Laboratory, is scheduled to begin serving qualified users across a broad spectrum of research areas in April 1993. Based on a low- emittance electron storage ring optimized to operate at 1.5 GeV, the ALS will have 11 long straight sections available for insertion devices (undulators and wigglers). Undulators will generate high- brightness soft x-ray and ultraviolet (XUV) radiation; wigglers will extend the spectrum generated into the hard x-ray region, but at a lower brightness. Up to 48 bending-magnet ports will also be available. Engineering design has begun on a complement of three undulators with periods of 8.0, 5.0, and 3.9 cm that between them will cover the photon-energy range from 5.4 eV to 2.5 keV when the first, third, and fifth harmonics are used, as well as a wiggler with a critical energy of 3.1 keV. Undulator beam lines will be based on high-resolution spherical-grating monochromators. A Call for Proposals has been issued for those who wish to participate in the design, development, commissioning, and operation of the initial complement of ALS experimental facilities (insertion devices, beam lines, and experimental stations) as members of a participating research team. The deadline for receipt of proposals was August 15, 1989. Proposals are expected to reflect the Letters of Interest received from potential PRTs during the previous year. 6 refs., 4 figs., 5 tabs.

Robinson, A.L.; Schlachter, A.S.

1989-09-01

127

Error resilient framework using one-pass explicit flexible macroblock ordering map generation and error concealment for H.264\\/AVC wireless video communication  

Microsoft Academic Search

H.264\\/AVC is the newest standard for digital video compression developed jointly by ITU-T's Video Coding Experts Group and ISO\\/IEC's Moving Picture Experts Group. One feature of the new standard is the adoption of a robust error resilience tool at the encoder known as flexible macroblock ordering (FMO). In this paper, we present an algorithm to generate a one-pass FMO map

Jantana Panyavaraporn; Supavadee Aramvith

2011-01-01

128

A modified composite video signal generator for the gamma 11 computing system  

SciTech Connect

Many nuclear medicine departments use the Gamma 11 computing system for image processing. In many cases, clinicians would like to display or record these images on equipment that has been designed for use with standard closed-circuit television or broadcast-type composite video signals. Unfortunately, the signals provided by the Gamma 11 differ from these standard signals in a number of important ways. The circuitry presented here converts the computer's output signals into a composite waveform that will properly drive virtually all equipment designed for closed-circuit television or standard broadcast-type applications.

Richardson, R.L.; Bettinger, W.H.

1983-09-01

129

Probable mode prediction for H.264 advanced video coding P slices using removable SKIP mode distortion estimation  

NASA Astrophysics Data System (ADS)

The H.264/AVC (advanced video coding) is used in a wide variety of applications including digital broadcasting and mobile applications, because of its high compression efficiency. The variable block mode scheme in H.264/AVC contributes much to its high compression efficiency but causes a selection problem. In general, rate-distortion optimization (RDO) is the optimal mode selection strategy, but it is computationally intensive. For this reason, the H.264/AVC encoder requires a fast mode selection algorithm for use in applications that require low-power and real-time processing. A probable mode prediction algorithm for the H.264/AVC encoder is proposed. To reduce the computational complexity of RDO, the proposed method selects probable modes among all allowed block modes using removable SKIP mode distortion estimation. Removable SKIP mode distortion is used to estimate whether or not a further divided block mode is appropriate for a macroblock. It is calculated using a no-motion reference block with a few computations. Then the proposed method reduces complexity by performing the RDO process only for probable modes. Experimental results show that the proposed algorithm can reduce encoding time by an average of 55.22% without significant visual quality degradation and increased bit rate.

You, Jongmin; Jeong, Jechang

2010-02-01

130

Advances in steam turbine technology for the power generation industry. PWR-Volume 26  

Microsoft Academic Search

This is a collection of the papers on advances in steam turbine technology for the power generation industry presented at the 1994 International Joint Power Generation Conference. The topics include advances in steam turbine design, application of computational fluid dynamics to turbine aerodynamic design, life extension of fossil and nuclear powered steam turbine generators, solid particle erosion control technologies, and

1994-01-01

131

ADVANCED CERAMIC MATERIALS FOR NEXT-GENERATION NUCLEAR APPLICATIONS  

SciTech Connect

Rising global energy demands coupled with increased environmental concerns point to one solution; they must reduce their dependence on fossil fuels that emit greenhouse gases. As the global community faces the challenge of maintaining sovereign nation security, reducing greenhouse gases, and addressing climate change nuclear power will play a significant and likely growing role. In the US, nuclear energy already provides approximately one-fifth of the electricity used to power factories, offices, homes, and schools with 104 operating nuclear power plants, located at 65 sites in 31 states. Additionally, 19 utilities have applied to the US Nuclear Regulatory Commission (NRC) for construction and operating licenses for 26 new reactors at 17 sites. This planned growth of nuclear power is occurring worldwide and has been termed the 'nuclear renaissance.' As major industrial nations craft their energy future, there are several important factors that must be considered about nuclear energy: (1) it has been proven over the last 40 years to be safe, reliable and affordable (good for Economic Security); (2) its technology and fuel can be domestically produced or obtained from allied nations (good for Energy Security); and (3) it is nearly free of greenhouse gas emissions (good for Environmental Security). Already an important part of worldwide energy security via electricity generation, nuclear energy can also potentially play an important role in industrial processes and supporting the nation's transportation sector. Coal-to-liquid processes, the generation of hydrogen and supporting the growing potential for a greatly increased electric transportation system (i.e. cars and trains) mean that nuclear energy could see dramatic growth in the near future as we seek to meet our growing demand for energy in cleaner, more secure ways. In order to address some of the prominent issues associated with nuclear power generation (i.e., high capital costs, waste management, and proliferation), the worldwide community is working to develop and deploy new nuclear energy systems and advanced fuel cycles. These new nuclear systems address the key challenges and include: (1) extracting the full energy value of the nuclear fuel; (2) creating waste solutions with improved long term safety; (3) minimizing the potential for the misuse of the technology and materials for weapons; (4) continually improving the safety of nuclear energy systems; and (5) keeping the cost of energy affordable.

Marra, J.

2010-09-29

132

PC-compatible computer-generated stimuli for video-task testing  

NASA Technical Reports Server (NTRS)

A program for automatic computer generation of novel nonverbal stimuli is described. The program, STIMGEN, allows menu-driven control over the type and appearance of stimuli. Data are presented in which two monkeys matched to sample with high accuracy using stimuli generated with STIMGEN. These data are interpreted to support the usefulness and value of automatic stimulus generation in a variety of applications.

Washburn, David A.

1990-01-01

133

Lifetime prediction modeling of airfoils for advanced power generation  

NASA Astrophysics Data System (ADS)

The use of gases produced from coal as a turbine fuel offers an attractive means for efficiently generating electric power from our Nation's most abundant fossil fuel resource. The oxy-fuel and hydrogen-fired turbine concepts promise increased efficiency and low emissions on the expense of increased turbine inlet temperature (TIT) and different working fluid. Developing the turbine technology and materials is critical to the creation of these near-zero emission power generation technologies. A computational methodology, based on three-dimensional finite element analysis (FEA) and damage mechanics is presented for predicting the evolution of creep and fatigue in airfoils. We took a first look at airfoil thermal distributions in these advanced turbine systems based on CFD analysis. The damage mechanics-based creep and fatigue models were implemented as user modified routine in commercial package ANSYS. This routine was used to visualize the creep and fatigue damage evolution over airfoils for hydrogen-fired and oxy-fuel turbines concepts, and regions most susceptible to failure were indentified. Model allows for interaction between creep and fatigue damage thus damage due to fatigue and creep processes acting separately in one cycle will affect both the fatigue and creep damage rates in the next cycle. Simulation results were presented for various thermal conductivity of the top coat. Surface maps were created on the airfoil showing the development of the TGO scale and the Al depletion of the bond coat. In conjunction with model development, laboratory-scale experimental validation was executed to evaluate the influence of operational compressive stress levels on the performance of the TBC system. TBC coated single crystal coupons were exposed isothermally in air at 900, 1000, 1100oC with and without compressive load. Exposed samples were cross-sectioned and evaluated with scanning electron microscope (SEM). Performance data was collected based on image analysis. Energy-dispersive x-ray (EDX) was employed to study the elemental distribution in TBC system after exposure. Nanoindentation was used to study the mechanical properties (Young's modulus and hardness) of the components in the TBC system and their evolution with temperature and time.

Karaivanov, Ventzislav Gueorguiev

134

Oxygen Generation from Carbon Dioxide for Advanced Life Support  

NASA Technical Reports Server (NTRS)

The partial electrochemical reduction of CO2 using ceramic oxygen generators (COGs) is well known and has been studied. Conventional COGs use yttria-stabilized zirconia (YSZ) electrolytes and operate at temperatures greater than 700 C (1, 2). Operating at a lower temperature has the advantage of reducing the mass of the ancillary components such as insulation. Moreover, complete reduction of metabolically produced CO2 (into carbon and oxygen) has the potential of reducing oxygen storage weight if the oxygen can be recovered. Recently, the University of Florida developed ceramic oxygen generators employing a bilayer electrolyte of gadolinia-doped ceria and erbia-stabilized bismuth oxide (ESB) for NASA s future exploration of Mars (3). The results showed that oxygen could be reliably produced from CO2 at temperatures as low as 400 C. These results indicate that this technology could be adapted to CO2 removal from a spacesuit and other applications in which CO2 removal is an issue. This strategy for CO2 removal in advanced life support systems employs a catalytic layer combined with a COG so that the CO2 is reduced completely to solid carbon and oxygen. First, to reduce the COG operating temperature, a thin, bilayer electrolyte was employed. Second, to promote full CO2 reduction while avoiding the problem of carbon deposition on the COG cathode, a catalytic carbon deposition layer was designed and the cathode utilized materials shown to be coke resistant. Third, a composite anode was used consisting of bismuth ruthenate (BRO) and ESB that has been shown to have high performance (4). The inset of figure 1 shows the conceptual design of the tubular COG and the rest of the figure shows schematically the test apparatus. Figure 2 shows the microstructure of a COG tube prior to testing. During testing, current is applied across the cell and initially CuO is reduced to copper metal by electrochemical pumping. Then the oxygen source becomes the CO/CO2. This presentation details the results of testing the COG.

Bishop, s. R.; Duncan, K. L.; Hagelin-Weaver, H. E.; Neal, L.; Paul, H. L.; Wachsman, E. D.

2007-01-01

135

Development of third generation advanced high strength steels  

NASA Astrophysics Data System (ADS)

Lightweight duplex steels with combinations of either bainite, acicular ferrite, and austenite or martensite and austenite were investigated as third generation advanced high strength steels targeted for automotive applications. Large additions of manganese (> 13 wt%) and carbon (<0.2wt%) were employed to stabilize the austenite phase. Silicon additions between 1 and 2 wt% were added to suppress cementite formation. Strength and ductility were increased while density was decreased with aluminum additions between 2.4 and 5.5 wt% to the steel. This research addressed the dependence of alloying on microstructures and mechanical behavior for high manganese and aluminum duplex steels that were cast and subsequently hot rolled. Duplex steels with different volume fractions of primary delta-ferrite were used to study the crystallography of austenite fanned during the peritectic reaction. Solute profiles across the peritectic interface showed aluminum segregated near the interface which promoted bainitic ferrite formation. Thermal treatments were used to manipulate the concentration and type of oxides and the ferrite plate density was found to correlate with inclusions of low misfit in steels with austenite grain size of 16.5 microm. A steel with bainite and acicular ferrite produced an ultimate tensile strength of 970 MPa and elongation of 40%. The mechanical prope1iies depended on the strengths and size of the microstructural constituents. Work hardening behavior was examined in a steel exhibiting multiple martensitic transformation induced plasticity (gamma-austenite?epsilon-smartensite?alpha-martensite). A strain hardening exponent as high as 1.4 was observed with ultimate tensile strength and elongation as high as 1,165 MPa and 34%.

McGrath, Meghan Colleen

136

Using Xilinx System Generator for Real Time Hardware Co-simulation of Video Processing System  

Microsoft Academic Search

\\u000a The use of rapid prototyping tools such as MATLAB-Simulink and Xilinx System Generator becomes increasingly important because\\u000a of time-to-market constraints. This paper presents a methodology for implementing real-time DSP applications on a reconfigurable\\u000a logic platform using Xilinx System Generator (XSG) for Matlab. The methodology aims to improve the design verfication efficiency\\u000a for such complex system. It presents architecture for Color

Taoufik Saidani; Mohamed Atri; Dhaha Dia; Rached Tourki

137

Hardware Co-simulation For Video Processing Using Xilinx System Generator  

Microsoft Academic Search

The use of rapid prototyping tools such as MATLAB- Simulink and Xilinx System Generator becomes increasingly important because of time-to-market constraints. This paper presents a methodology for implementing real-time DSP applications on a reconfigurable logic platform using Xilinx System Generator (XSG) for Matlab. The methodology aims to improve the design verfication efficiency for such complex system. It presents an architecture

T. Saidani; D. Dia; W. Elhamzi; M. Atri; R. Tourki

2009-01-01

138

Remote video surveillance systems  

NASA Astrophysics Data System (ADS)

Unmanned Ground Sensors (UGS) have seen resurgence in recent years for use in a growing number of remote surveillance applications. These sensors can provide a wide range of information to assist an analyst in recognizing the type of intrusion detected. The addition of sensor cued imagers has also gained popularity in extending the recognition capabilities of sensors to allow identification of people and vehicles thereby expanding the mission capabilities of these systems. We are now on the brink of the next advance in remote surveillance - unmanned video - which promises to provide information far beyond recognition and identification of individuals. Knowledge of the intent of individuals operating within an Area of Interest (AOI) is possible with the retrieval of collected video. Three technologies are converging to drive remote video capability; (1) low power video processors allow advanced video functions including video compression and automated target tracking to be applied at the video input point, (2) high bandwidth tactical radio networks offering robustness and communication range beyond commercial networks are now available to exfiltrate the video, and (3) low power sensors provide the ability to maximize system operational life through power management of multiple tiers within the system. These advances have combined to create the Remote Video Surveillance Systems which promise a leap forward in the situational knowledge provided by unmanned systems.

Post, Robert P.; Sasaki, Hironori M.

2009-05-01

139

Advancing the Next Generation of Health Risk Assessment  

EPA Science Inventory

Over the past 20 years, knowledge of the genome and its function has increased dramatically, but risk assessment methodologies utilizing such knowledge have not advanced accordingly. Objective. This review describes a collaborative effort among several federal and stat...

140

Video Event Trigger  

NASA Technical Reports Server (NTRS)

Video event trigger (VET) processes video image data to generate trigger signal when image shows significant change like motion or appearance, disappearance, change in color, change in brightness, or dilation of object. System aids in efficient utilization of image-data-storage and image-data-processing equipment in applications in which many video frames show no changes and are wasteful to record and analyze all frames when only relatively few frames show changes of interest. Applications include video recording of automobile crash tests, automated video monitoring of entrances, exits, parking lots, and secure areas.

Williams, Glenn L.; Lichter, Michael J.

1994-01-01

141

Osama Bin Laden Video  

NSDL National Science Digital Library

Most of our readers have probably already seen the second resource, the video of Osama Bin Laden revealing that he knew in advance about the September 11 attacks, but in case you've just returned from a holiday with no radio or television you can view excerpts from the video and read the full transcript (English translation) at CNN.com.

2001-01-01

142

Materials choices for the advanced LWR steam generators  

Microsoft Academic Search

Current light water reactor (LWR) steam generators have been affected by a variety of corrosion and mechanical damage degradation mechanisms. Included are wear caused by tube vibration, intergranular corrosion, pitting, and thinning or wastage of the steam generator tubing and accelerated corrosion of carbon steel supports (denting). The Electric Power Research Institute (EPRI) and the Steam Generator Owners Groups (I,

J. P. N. Paine; C. E. Shoemaker; A. R. McIlree

1987-01-01

143

Parallel unstructured mesh generation by an advancing front method  

Microsoft Academic Search

Mesh generation is a critical step in high fldelity computational simu- lations. High quality and high density meshes are required to accurately capture the complex physical phenomena. A parallel framework has been developed to generate large-scale meshes in a short period of time. A coarse volume mesh is generated flrst to provide the basis of block inter- faces and partitioned

Yasushi Ito; Alan M. Shih; Anil K. Erukala; Bharat K. Soni; Andrey N. Chernikov; Nikos P. Chrisochoides; Kazuhiro Nakahashi

2007-01-01

144

Advanced rotor materials and manufacturing techniques for the superconducting generator  

SciTech Connect

A description of the 300 MVA Superconducting Generator being designed and manufactured under a project jointly sponsored by Electric Power Research Institute and Westinghouse Electric Corporation is presented. The materials selection and manufacture of three components for the generator rotor assembly are reviewed. The use of the superalloy, Inconel 706, in ingot extrusions, cold roll extrusions, and explosive welding is discussed, with regard to producing the field winding support cylinder, radiant heat shield assembly, and outer damper assembly of the generator.

Edmonds, J.S.; Hooper, G.D.

1982-12-01

145

Made in Florida: Videos  

NSDL National Science Digital Library

This webpage from the Florida Advanced Technological Education Center for Manufacturing (FLATE) features two videos which will help students understand the manufacturing of products domestically. Specifically, the videos focus on products made in the state of Florida. More than 16,000 companies and 400,000 Florida residents are active in manufacturing. The first video, which focuses on general manufacturing in Florida, is available in English and Spanish. The second video, which is only available in English, looks at the manufacture of Tropicana orange juice.

2011-09-19

146

P3 Power Generation System for Advanced Missile Defense Applications.  

National Technical Information Service (NTIS)

The P3 project was to develop and demonstrate a highly flexible, highly modular power system for advanced missile defense applications. With its flexible, modular design, the P3 power system has the potential to become the basic building block around whic...

2008-01-01

147

Software Based Video Improvement Implementation  

Microsoft Academic Search

This paper presents the evaluation of the programmable platforms regarding development and implementation of advanced real-time video improvement algorithms to be listed, as well as benchmark of such solutions vs. hardware implementations. Evaluation is done using video processing framework and implementation of the appropriate video algorithms on IBM Cell BE based platform.

N. Lukic; I. Papp; Z. Marceta; M. Temerinac

2009-01-01

148

Advanced Scanning Laser-Doppler Vibrometer with Computer Generated Holograms  

Microsoft Academic Search

In this paper we present a novel technique for steering the beam of a scanning laser-Doppler vibrometer (LDV) using a Spatial Light Modulator (SLM). Computer Generated Holograms (CGH) are employed to obtain the phase maps displayed by the SLM. Due to this approach, spurious diffraction orders are generated. We present concepts to suppress these diffraction orders so as to realize

S. Zwick; M. Warber; T. Haist; F. Schaal; W. Osten; S. Boedecker; C. Rembe

2010-01-01

149

Video textures  

Microsoft Academic Search

This paper introduces a new type of medium, called a video texture, which has qualities somewhere between those of a photograph and a video. A video texture provides a continuous infinitely varying stream of images. While the individual frames of a video texture may be repeated from time to time, the video sequence as a whole is never repeated exactly.

Arno Schödl; Richard Szeliski; David H. Salesin; Irfan A. Essa

2000-01-01

150

Video filtering on interframes  

NASA Astrophysics Data System (ADS)

In digital video compression, motion estimation is most commonly used in reducing temporal redundancy. The motion information generated by motion estimation is usually coded in the compressed stream. In many situations, the compressed video needs to be post- processed, for example, filtered to generate an out-of-focus effect. The filtered video then requires another motion estimation to be coded in bit stream. We propose an algorithm to reuse the existing motion information in the original video to avoid or aid the motion estimation in the recompression. Since this technique significantly reduces post-processing time for compressed video when the output is required in compressed form, it is highly desirable in digital video broadcasting systems.

Shen, Bo

1999-11-01

151

Video fingerprinting: features for duplicate and similar video detection and query-based video retrieval  

NASA Astrophysics Data System (ADS)

A video "fingerprint" is a feature extracted from the video that should represent the video compactly, allowing faster search without compromising the retrieval accuracy. Here, we use a keyframe set to represent a video, motivated by the video summarization approach. We experiment with different features to represent each keyframe with the goal of identifying duplicate and similar videos. Various image processing operations like blurring, gamma correction, JPEG compression, and Gaussian noise addition are applied on the individual video frames to generate duplicate videos. Random and bursty frame drop errors of 20%, 40% and 60% (over the entire video) are also applied to create more noisy "duplicate" videos. The similar videos consist of videos with similar content but with varying camera angles, cuts, and idiosyncrasies that occur during successive retakes of a video. Among the feature sets used for comparison, for duplicate video detection, Compact Fourier-Mellin Transform (CFMT) performs the best while for similar video retrieval, Scale Invariant Feature Transform (SIFT) features are found to be better than comparable-dimension features. We also address the problem of retrieval of full-length videos with shorter-length clip queries. For identical feature size, CFMT performs the best for video retrieval.

Sarkar, Anindya; Ghosh, Pratim; Moxley, Emily; Manjunath, B. S.

2008-01-01

152

Advanced feedwater control for next generation nuclear power systems  

NASA Astrophysics Data System (ADS)

In current generation Pressurized Water Reactors (PWRs), the control of Steam Generator level experiences challenges over the full range of plant operating conditions. These challenges can be particularly troublesome in the low power range where the feedwater is highly subcooled and minor changes in the feed flow may cause oscillations in the SG level, potentially leading to reactor trip. Substantial attention has been given to feedwater control systems with recognition of the difficulty of the full range feedwater control problem due to steam generator level shrink-swell phenomena, changes in valve and flow path characteristics, and other nonlinear phenomena over the full range of operating conditions. The IRIS reactor concept adds additional challenges to the feedwater control problem as a result of a steam generator design where neither level or steam generator mass inventory can be measured directly. Neural networks have demonstrated capabilities to capture a wide range of dynamic signal transformation and non-linear problems. In this project a detailed engineering simulation of plant response is used to develop and test neural control methods for the IRIS full range feedwater control problem. The established neural feed controller has demonstrated the capability to improve the performance of SG level or mass control under transient conditions and over a wide range of reactor power including abnormal conditions.

Shen, Hengliang

153

ADVANCED MATERIALS RESEARCH WITH 3RD GENERATION SYNCHROTRON LIGHT  

Microsoft Academic Search

H and D surface nanochemistry on an advanced wide band gap semiconductor, silicon carbide is investigated by synchrotron radiation-based\\u000a core level and valence band photoemission, infrared absorption and scanning tunneling spectroscopy, showing the 1st example\\u000a of H\\/D-induced semiconductor surface metallization, that also occurs on a pre-oxidized surface. These results are compared\\u000a to recent state-of-the-art ab-initio total energy calculations. Most interestingly,

P. Soukiassian; M. D’angelo; H. Enriquez; V. Yu. Aristov

154

Advanced Computational Materials Science: Application to Fusion and Generation IV Fission Reactors (Workshop Report)  

Microsoft Academic Search

The ''Workshop on Advanced Computational Materials Science: Application to Fusion and Generation IV Fission Reactors'' was convened to determine the degree to which an increased effort in modeling and simulation could help bridge the gap between the data that is needed to support the implementation of these advanced nuclear technologies and the data that can be obtained in available experimental

Stoller

2004-01-01

155

Nonchronological video synopsis and indexing.  

PubMed

The amount of captured video is growing with the increased numbers of video cameras, especially the increase of millions of surveillance cameras that operate 24 hours a day. Since video browsing and retrieval is time consuming, most captured video is never watched or examined. Video synopsis is an effective tool for browsing and indexing of such a video. It provides a short video representation, while preserving the essential activities of the original video. The activity in the video is condensed into a shorter period by simultaneously showing multiple activities, even when they originally occurred at different times. The synopsis video is also an index into the original video by pointing to the original time of each activity. Video Synopsis can be applied to create a synopsis of an endless video streams, as generated by webcams and by surveillance cameras. It can address queries like "Show in one minute the synopsis of this camera broadcast during the past day''. This process includes two major phases: (i) An online conversion of the endless video stream into a database of objects and activities (rather than frames). (ii) A response phase, generating the video synopsis as a response to the user's query. PMID:18787245

Pritch, Yael; Rav-Acha, Alex; Peleg, Shmuel

2008-11-01

156

Advances in steam turbine technology for power generation  

Microsoft Academic Search

This book contains articles presented at the 1990 International Joint Power Generation Conference. It is organized under the following headings: Solid particle erosion in steam turbines, Steam turbine failure analysis, Steam turbine upgrades, steam turbine blading development, Boiler feed pumps and auxiliary steam turbine drives.

Bellanca

1990-01-01

157

Recent advances in direct solar thermal power generation  

Microsoft Academic Search

The recent energy crisis and environmental burden are becoming increasingly urgent and drawing enormous attention to solar-energy utilization. Direct solar thermal power generation technologies, such as thermoelectric, thermionic, magnetohydrodynamic, and alkali-metal thermoelectric methods, are among the most attractive ways to provide electric energy from solar heat. On the one hand, these methods have the potential to be more efficient than

Yue-Guang Deng; Jing Liu

2009-01-01

158

Distributed generation: remote power systems with advanced storage technologies  

Microsoft Academic Search

The paper discusses derived from an earlier hypothetical study of remote villiages. It considers the policy implications for communities who have their own local power resources rather than those distributed through transmission from distant sources such as dams, coal power plants or even renewables generation from wind farms, solar thermal or other resources. The issues today, post 911 and the

Woodrow Clark; William Isherwood

2004-01-01

159

Primary electric power generation systems for advanced-technology engines  

NASA Technical Reports Server (NTRS)

The advantages of the all electric airplane are discussed. In the all electric airplane the generator is the sole source of electric power; it powers the primary and secondary flight controls, the environmentals, and the landing gear. Five candidates for all electric power systems are discussed and compared. Cost benefits of the all electric airplane are discussed.

Cronin, M. J.

1983-01-01

160

Advanced Micro Optics Characterization Using Computer Generated Holograms  

SciTech Connect

This CRADA has enabled the validation of Computer Generated Holograms (CGH) testing for certain classes of micro optics. It has also identified certain issues that are significant when considering the use of CGHs in this application. Both contributions are advantageous in the pursuit of better manufacturing and testing technologies for these important optical components.

Arnold, S.; Maxey, L.C.; Moreshead, W.; Nogues, J.L.

1998-11-01

161

Laser-generated shock waves and applications to advanced materials  

SciTech Connect

The use of lasers for the generation and application of high-pressure shock waves offers unique advantages and challenges. In contrast to impact systems, the range of pressures and strain rates is substantially greater using laser drive. The ability to change the temporal shape of the drive pulse allows a variety of strain-rate conditions to be obtained. In addition, high time-resolution in situ diagnostic methods are relatively simple to implement. Lasers can be at a disadvantage compared to impact methods in terms of shock generation, simplicity of the states achieved, the difficulty of characterizing bulk properties, and sample size. I will review the physics of laser-driven shock physics, diagnostic methods, and applications, with an emphasis on material physics. I will also present some views on important new directions for this area of research.

Holmes, N.C.

1996-01-19

162

Advanced theory of multiple exciton generation effect in quantum dots  

NASA Astrophysics Data System (ADS)

The theoretical aspects of the effect of multiple exciton generation (MEG) in quantum dots (QDs) have been analysed in this work. The statistical theory of MEG in QDs based on Fermi's approach is presented, taking into account the momentum conservation law. According to Fermi this approach should give the ultimate quantum efficiencies of multiple particle generation. The microscopic mechanism of this effect is based on the theory of electronic "shaking". According to this approach, the wave function of "shaking" electrons can be selected as Plato's functions with effective charges depending on the number of generated excitons. From the theory it is known increasing the number of excitons leads to enhancement of the Auger recombination of electrons which results in reduced quantum yields of excitons. The deviation of the averaged multiplicity of the MEG effect from the Poisson law of fluctuations has been investigated on the basis of synergetics approaches. In addition the role of interface electronic states of QDs and ligands has been considered by means of quantum mechanical approaches. The size optimisation of QDs has been performed to maximise the multiplicity of the MEG effect.

Oksengendler, B. L.; Turaeva, N. N.; Rashidova, S. S.

2012-06-01

163

High dynamic range video  

Microsoft Academic Search

Typical video footage captured using an off-the-shelf camcorder suffers from limited dynamic range. This paper describes our approach to generate high dynamic range (HDR) video from an image sequence of a dynamic scene captured while rapidly varying the exposure of each frame. Our approach consists of three parts: automatic exposure control during capture, HDR stitching across neighboring frames, and tonemapping

Sing Bing Kang; Matthew Uyttendaele; Simon A. J. Winder; Richard Szeliski

2003-01-01

164

Generation of three-dimensional unstructured grids by the advancing-front method  

NASA Technical Reports Server (NTRS)

The generation of three-dimensional unstructured grids using the advancing-front technique is described. While this generation technique has been shown to be effective for the generation of unstructured grids in two dimensions, its extension to three-dimensional regions required the development of surface definition software and sophisticated data structures to avoid excessive CPU-time overheads for the search operations involved. After obtaining an initial triangulation of the surfaces, tetrahedrons are generated by successively deleting faces from the generation front. Details of the mesh generation algorithm are given, together with examples and timings.

Lohner, Rainald; Parikh, Paresh

1988-01-01

165

Advanced staged combustion system for power generation from coal  

US Patent & Trademark Office Database

A process and apparatus for generating electricity from coal comprising a vertically stacked, three-stage combustor in which a sorbent is calcined in a calciner zone of the combustor and transferred to a carbonizer zone disposed below the calciner zone, coal introduced into the carbonizer zone is carbonized, producing char and spent sorbent, both of which are transferred to a combustor zone disposed below the carbonizer zone, in which the char is combusted at a substoichemetic air-to-coal ratio, producing a fuel gas. The fuel gas is cleaned and combusted in a turbine combustor, producing a flue gas which is introduced into a gas turbine for producing electricity.

1993-09-14

166

Advanced Unstructured Grid Generation for Complex Aerodynamic Applications  

NASA Technical Reports Server (NTRS)

A new approach for distribution of grid points on the surface and in the volume has been developed and implemented in the NASA unstructured grid generation code VGRID. In addition to the point and line sources of prior work, the new approach utilizes surface and volume sources for automatic curvature-based grid sizing and convenient point distribution in the volume. A new exponential growth function produces smoother and more efficient grids and provides superior control over distribution of grid points in the field. All types of sources support anisotropic grid stretching which not only improves the grid economy but also provides more accurate solutions for certain aerodynamic applications. The new approach does not require a three-dimensional background grid as in the previous methods. Instead, it makes use of an efficient bounding-box auxiliary medium for storing grid parameters defined by surface sources. The new approach is less memory-intensive and more efficient computationally. The grids generated with the new method either eliminate the need for adaptive grid refinement for certain class of problems or provide high quality initial grids that would enhance the performance of many adaptation methods.

Pirzadeh, Shahyar Z.

2008-01-01

167

Advanced Stirling Radioisotope Generator: Design Processes, Reliability Analyses Impacts, and Extended Operation Tests  

Microsoft Academic Search

NASA is currently funding an effort involving the Department of Energy (DOE), Lockheed Martin (LM), Glenn Research Center (GRC), and Sunpower (SP), Inc. to develop a high specific power Advanced Stirling Radioisotope Generator (ASRG). GRC and SP are responsible for providing the Stirling convertor, while LM is responsible for the generator housing, controller, and system integration. GRC also provides supporting

Chuong T. Ha; Rene´ Fernandez; Steven L. Cornford; Martin S. Feather

2008-01-01

168

Advanced modeling of an exploding flux compression generator using lumped element models of magnetic diffusion  

Microsoft Academic Search

This paper describes an advanced PSpice(R) model, which is used to complement the experimental work on explosive flux compression generators. This work is conducted at Texas Tech University in the framework of a MURI program. The results from the model are compared to actual results from generators that have been tested in the authors' laboratory. To achieve better fidelity of

M. Giesselmann; T. Heeren; A. Neuber; M. Kristiansen

2001-01-01

169

Watermarking of Free-view Video  

Microsoft Academic Search

With the advances in image based rendering (IBR) in recent years, generation of a realistic arbitrary view of a scene from a number of original views has become cheaper and faster. One of the main applications of this progress has emerged as free-view TV(FTV), where TV-viewers select freely the viewing position and angle via IBR on the transmitted multiview video.

Alper Koz; Cevahir Cigla; A. Aydin Alatan

2010-01-01

170

Domain Decomposition By the Advancing-Partition Method for Parallel Unstructured Grid Generation  

NASA Technical Reports Server (NTRS)

A new method of domain decomposition has been developed for generating unstructured grids in subdomains either sequentially or using multiple computers in parallel. Domain decomposition is a crucial and challenging step for parallel grid generation. Prior methods are generally based on auxiliary, complex, and computationally intensive operations for defining partition interfaces and usually produce grids of lower quality than those generated in single domains. The new technique, referred to as "Advancing Partition," is based on the Advancing-Front method, which partitions a domain as part of the volume mesh generation in a consistent and "natural" way. The benefits of this approach are: 1) the process of domain decomposition is highly automated, 2) partitioning of domain does not compromise the quality of the generated grids, and 3) the computational overhead for domain decomposition is minimal. The new method has been implemented in NASA's unstructured grid generation code VGRID.

Pirzadeh, Shahyar Z.; Zagaris, George

2009-01-01

171

Video in the Proficiency-Based Advanced Conversation Class: An Example from the Russian-Language Curriculum.  

ERIC Educational Resources Information Center

Reviews research on proficiency levels attained by foreign language students, and describes an advanced Russian conversation course, which is geared toward students who have achieved intermediate-mid or intermediate-high oral proficiency and who are striving towards advanced level speech according to the American Council on the Teaching of Foreign…

Rifkin, Benjamin

2000-01-01

172

Advanced Unstructured Grid Generation for Complex Aerodynamic Applications  

NASA Technical Reports Server (NTRS)

A new approach for distribution of grid points on the surface and in the volume has been developed. In addition to the point and line sources of prior work, the new approach utilizes surface and volume sources for automatic curvature-based grid sizing and convenient point distribution in the volume. A new exponential growth function produces smoother and more efficient grids and provides superior control over distribution of grid points in the field. All types of sources support anisotropic grid stretching which not only improves the grid economy but also provides more accurate solutions for certain aerodynamic applications. The new approach does not require a three-dimensional background grid as in the previous methods. Instead, it makes use of an efficient bounding-box auxiliary medium for storing grid parameters defined by surface sources. The new approach is less memory-intensive and more efficient computationally. The grids generated with the new method either eliminate the need for adaptive grid refinement for certain class of problems or provide high quality initial grids that would enhance the performance of many adaptation methods.

Pirzadeh, Shahyar

2010-01-01

173

Advanced Stirling Radioisotope Generator (ASRG) Thermal Power Model in MATLAB  

NASA Technical Reports Server (NTRS)

This paper presents a one-dimensional steady-state mathematical thermal power model of the ASRG. It aims to provide a guideline of understanding how the ASRG works and what can change its performance. The thermal dynamics and energy balance of the generator is explained using the thermal circuit of the ASRG. The Stirling convertor performance map is used to represent the convertor. How the convertor performance map is coupled in the thermal circuit is explained. The ASRG performance characteristics under i) different sink temperatures and ii) over the years of mission (YOM) are predicted using the one-dimensional model. Two Stirling converter control strategies, i) fixing the hot-end of temperature of the convertor by adjusting piston amplitude and ii) fixing the piston amplitude, were tested in the model. Numerical results show that the first control strategy can result in a higher system efficiency than the second control strategy when the ambient gets warmer or the general-purpose heat source (GPHS) fuel load decays over the YOM. The ASRG performance data presented in this paper doesn't pertain to the ASRG flight unit. Some data of the ASRG engineering unit (EU) and flight unit that are available in public domain are used in this paper for the purpose of numerical studies.

Wang, Xiao-Yen, J.

2012-01-01

174

Advances Made in the Next Generation of Satellite Networks  

NASA Technical Reports Server (NTRS)

Because of the unique networking characteristics of communications satellites, global satellite networks are moving to the forefront in enhancing national and global information infrastructures. Simultaneously, broadband data services, which are emerging as the major market driver for future satellite and terrestrial networks, are being widely acknowledged as the foundation for an efficient global information infrastructure. In the past 2 years, various task forces and working groups around the globe have identified pivotal topics and key issues to address if we are to realize such networks in a timely fashion. In response, industry, government, and academia undertook efforts to address these topics and issues. A workshop was organized to provide a forum to assess the current state-of-the-art, identify key issues, and highlight the emerging trends in the next-generation architectures, data protocol development, communication interoperability, and applications. The Satellite Networks: Architectures, Applications, and Technologies Workshop was hosted by the Space Communication Program at the NASA Lewis Research Center in Cleveland, Ohio. Nearly 300 executives and technical experts from academia, industry, and government, representing the United States and eight other countries, attended the event (June 2 to 4, 1998). The program included seven panels and invited sessions and nine breakout sessions in which 42 speakers presented on technical topics. The proceedings covers a wide range of topics: access technology and protocols, architectures and network simulations, asynchronous transfer mode (ATM) over satellite networks, Internet over satellite networks, interoperability experiments and applications, multicasting, NASA interoperability experiment programs, NASA mission applications, and Transmission Control Protocol/Internet Protocol (TCP/IP) over satellite: issues, relevance, and experience.

Bhasin, Kul B.

1999-01-01

175

Immersive chemistry video game  

Microsoft Academic Search

A team at Purdue University has been working on a NSF sponsored project to create a set of research-validated recommendations for the development of science video games. As a way to accomplish this task, the team created a three-dimensional first-person shooter video game that requires players to utilize chemistry knowledge to advance in the game-world. A team of chemistry, computer

Carlos Morales; Kermin Martínez-Hernández; Gabriela Weaver; Ryan Pedela; Kellen Maicher; Eugene Elkin; Doug Danforth; Naveen Nattam

2006-01-01

176

Video summarization based tele-endoscopy: a service to efficiently manage visual data generated during wireless capsule endoscopy procedure.  

PubMed

Wireless capsule endoscopy (WCE) has great advantages over traditional endoscopy because it is portable and easy to use. More importantly, WCE combined with mobile computing ensures rapid transmission of diagnostic data to hospitals and enables off-site senior gastroenterologists to offer timely decision making support. However, during this WCE process, video data are produced in huge amounts, but only a limited amount of data is actually useful for diagnosis. The sharing and analysis of this video data becomes a challenging task due the constraints such as limited memory, energy, and communication capability. In order to facilitate efficient WCE data collection and browsing tasks, we present a video summarization-based tele-endoscopy service that estimates the semantically relevant video frames from the perspective of gastroenterologists. For this purpose, image moments, curvature, and multi-scale contrast are computed and are fused to obtain the saliency map of each frame. This saliency map is used to select keyframes. The proposed tele-endoscopy service selects keyframes based on their relevance to the disease diagnosis. This ensures the sending of diagnostically relevant frames to the gastroenterologist instead of sending all the data, thus saving transmission costs and bandwidth. The proposed framework also saves storage costs as well as the precious time of doctors in browsing patient's information. The qualitative and quantitative results are encouraging and show that the proposed service provides video keyframes to the gastroenterologists without discarding important information. PMID:25037715

Mehmood, Irfan; Sajjad, Muhammad; Baik, Sung Wook

2014-09-01

177

Personalized abstraction of broadcasted American football video by highlight selection  

Microsoft Academic Search

Video abstraction is defined as creating shorter video clips or video posters from an original video stream. In this paper, we propose a method of generating a personalized abstract of broadcasted American football video. We first detect significant events in the video stream by matching textual overlays appearing in an image frame with the descriptions of gamestats in which highlights

Noboru Babaguchi; Yoshihiko Kawai; Takehiro Ogura; Tadahiro Kitahashi

2004-01-01

178

Advanced Soldier Thermoelectric Power System for Power Generation from Battlefield Heat Sources  

Microsoft Academic Search

The U.S. military uses large amounts of fuel during deployments and battlefield operations. This project sought to develop a lightweight, small form-factor, soldier-portable advanced thermoelectric (TE) system prototype to recover and convert waste heat from various deployed military equipment (i.e., diesel generators\\/engines, incinerators, vehicles, and potentially mobile kitchens), with the ultimate purpose of producing power for soldier battery charging, advanced

Terry J. Hendricks; Tim Hogan; Eldon D. Case; Charles J. Cauchy

2010-01-01

179

Toward robust watermarking of scalable video  

NASA Astrophysics Data System (ADS)

This paper pulls together recent advances in scalable video coding and protection and investigates the impact on watermarking. After surveying the literature on the protection of scalable video via cryptographic and watermarking means, the robustness of a simple wavelet-based video watermarking scheme against combined bit stream adaptations performed on JSVM (the H.264/MPEG-4 AVC scalable video coding extension) and MC-EZBC scalable video bit streams is examined.

Meerwald, Peter; Uhl, Andreas

2008-03-01

180

Advancing Design-for-Assembly: The Next Generation in Assembly Planning  

SciTech Connect

At the 1995 IEEE Symposium on Assembly and Task Planning, Sandia National Laboratories introduced the Archimedes 2 Software Tool [2]. The system was described as a second-generation assembly planning system that allowed preliminmy application of awembly planning for industry, while solidly supporting further research in planning techniques. Sandia has worked closely with indust~ and academia over the last four years. The results of these working relationships have bridged a gap for the next generation in assembly planning. Zke goal of this paper is to share Sandia 's technological advancements in assembly planning over the last four years and the impact these advancements have made on the manufacturing communip.

Calton, T.L.

1998-12-09

181

Video document  

NASA Astrophysics Data System (ADS)

The metaphor of film and TV permeates the design of software to support video on the PC. Simply transplanting the non- interactive, sequential experience of film to the PC fails to exploit the virtues of the new context. Video ont eh PC should be interactive and non-sequential. This paper experiments with a variety of tools for using video on the PC that exploits the new content of the PC. Some feature are more successful than others. Applications that use these tools are explored, including primarily the home video archive but also streaming video servers on the Internet. The ability to browse, edit, abstract and index large volumes of video content such as home video and corporate video is a problem without appropriate solution in today's market. The current tools available are complex, unfriendly video editors, requiring hours of work to prepare a short home video, far more work that a typical home user can be expected to provide. Our proposed solution treats video like a text document, providing functionality similar to a text editor. Users can browse, interact, edit and compose one or more video sequences with the same ease and convenience as handling text documents. With this level of text-like composition, we call what is normally a sequential medium a 'video document'. An important component of the proposed solution is shot detection, the ability to detect when a short started or stopped. When combined with a spreadsheet of key frames, the host become a grid of pictures that can be manipulated and viewed in the same way that a spreadsheet can be edited. Multiple video documents may be viewed, joined, manipulated, and seamlessly played back. Abstracts of unedited video content can be produce automatically to create novel video content for export to other venues. Edited and raw video content can be published to the net or burned to a CD-ROM with a self-installing viewer for Windows 98 and Windows NT 4.0.

Davies, Bob; Lienhart, Rainer W.; Yeo, Boon-Lock

1999-08-01

182

Video Reference and the Library Kiosk: Experimentation and Evaluation  

Microsoft Academic Search

Advances in Internet communication technology have enabled the use of video in several aspects of library public services. This paper discusses an ongoing pilot program at Ohio University that experiments with video IM and video call clients as reference and outreach tools primarily through the use of video kiosks. Technical specifications and implementation of video reference services are discussed, in

Char Booth

2008-01-01

183

CVEPS - A Compressed Video Editing and Parsing System  

Microsoft Academic Search

Processing digital video directly in the compressed domain has many advantages in terms of storage efficiency, speed, and video quality. We have developed a compressed video editing and parsing system (CVEPS) with advanced video indexing and manipulation functions. The video parsing tools support automatic extraction of key visual features, e. g., scene cuts, transitional effects, camera operations (zoom\\/pan), shape and

Jianhao Mengand; Shih-fu Chang

1996-01-01

184

Investigation of the transient performance of superconducting generators with an advanced network-torsion-machine program  

SciTech Connect

The significant potential advantages of superconducting generators have stimulated large-scale efforts throughout the world to develop such generators for utility application. A thorough study of the transient performance of superconducting generators requires improved generator modeling in an efficient program for power system dynamics to adequately represent the highly complex interaction of the generator multi-damper system with the network. A novel approach to this task is presented in this paper. It consists of an advanced network-torsion-machine program to analyze electromagnetic and electromechanical transients in which iterative (repeatedly connected) T-network equivalent circuits for the generator d-q model have been integrated. The capability of this program is outlined and demonstrated by a spectrum of various system disturbances imposed on a large superconducting generator. First results are discussed and highlight particular design considerations of superconducting rotors for improved transient performance.

Kulig, T.S.; Lambrecht, D.; Liese, M.

1984-07-01

185

Unconstrained plastering : all-hexahedral mesh generation via advancing front geometry decomposition (2004-2008).  

SciTech Connect

The generation of all-hexahedral finite element meshes has been an area of ongoing research for the past two decades and remains an open problem. Unconstrained plastering is a new method for generating all-hexahedral finite element meshes on arbitrary volumetric geometries. Starting from an unmeshed volume boundary, unconstrained plastering generates the interior mesh topology without the constraints of a pre-defined boundary mesh. Using advancing fronts, unconstrained plastering forms partially defined hexahedral dual sheets by decomposing the geometry into simple shapes, each of which can be meshed with simple meshing primitives. By breaking from the tradition of previous advancing-front algorithms, which start from pre-meshed boundary surfaces, unconstrained plastering demonstrates that for the tested geometries, high quality, boundary aligned, orientation insensitive, all-hexahedral meshes can be generated automatically without pre-meshing the boundary. Examples are given for meshes from both solid mechanics and geotechnical applications.

Blacker, Teddy Dean; Staten, Matthew L.; Kerr, Robert A.; Owen, Steven James

2010-03-01

186

Automatic video tagging using content redundancy  

Microsoft Academic Search

The analysis of the leading social video sharing platform YouTube reveals a high amount of redundancy, in the form of videos with overlapping or duplicated content. In this pa- per, we show that this redundancy can provide useful infor- mation about connections between videos. We reveal these links using robust content-based video analysis techniques and exploit them for generating new

Stefan Siersdorfer; José San Pedro; Mark Sanderson

2009-01-01

187

Are They Listening Better? Supporting EFL College Students' DVD Video Comprehension with Advance Organizers in a Multimedia English Course  

ERIC Educational Resources Information Center

As technology continues to evolve, authentic multimedia-based teaching materials are widely used in the English as a Foreign Language (EFL) classrooms. However, they may lie beyond most language learners' proficiency level. The purpose of this study was to investigate the use of advance organizers in conjunction with the cognitive theory of…

Li, Chen-Hong

2012-01-01

188

Biotechnology, Video Games, Rapid Prototyping  

NSDL National Science Digital Library

The ATETV project delivers web-based videos to connect students to careers in advanced technology. This episode of ATETV deals with biotechnology, video game design, and rapid prototyping. It can be viewed whole or in three segments: "Biotechnology Student Marina Watanabe on Why She Chose to Attend a Community College," "Video Game Design Student Brent Parsons on the Growing Market for Computer Simulations," and "What is Rapid Prototyping?" The running time for the full episode is 8:29.

2010-12-14

189

Toward a new generation of low-loss mirrors for the advanced gravitational waves interferometers.  

PubMed

The new generation of advanced interferometer needs fused silica mirrors having better optical and mechanical properties. This Letter describes the way to reduce the ion beam sputtering coating absorption at 1064 nm and to improve the layer thickness uniformity in order to coat two large mirrors (diameter 35 cm) at the same time. PMID:21499372

Pinard, L; Sassolas, B; Flaminio, R; Forest, D; Lacoudre, A; Michel, C; Montorio, J L; Morgado, N

2011-04-15

190

LOW NOX COMBUSTION CONCEPTS FOR ADVANCED POWER GENERATION SYSTEMS FIRING LOW-BTU GAS  

EPA Science Inventory

The report gives results of an analysis of several advanced power generating concepts firing low-Btu gasified coal. A combined gas-turbine/steam-cycle power plant with integrated gasifier was the most promising from fuel utilization and economic viewpoints. Two representative com...

191

Stator Conductor and Bore Seal Study for the Advanced High-Power Generator Program.  

National Technical Information Service (NTIS)

This report describes the results of a preliminary study to simplify the 36-strand, liquid-cooled stator conductor for the advanced 5-Mw, high-power generator. A specially configured four-strand conductor significantly simplifies the fabrication process w...

A. Druzsba

1986-01-01

192

Low Nox Combustion Concepts for Advanced Power Generation Systems Firing Low-Btu Gas.  

National Technical Information Service (NTIS)

The report gives results of an analysis of several advanced power generating concepts firing low-Btu gasified coal. A combined gas-turbine/steam-cycle power plant with integrated gasifier was the most promising from fuel utilization and economic viewpoint...

T. J. Tyson M. P. Heap C. J. Kau B. A. Folsom N. D. Brown

1977-01-01

193

"We're from the Generation that was Raised on Television": A Qualitative Exploration of Media Imagery in Elementary Preservice Teachers' Video Production  

ERIC Educational Resources Information Center

In this article, the authors present their analysis of preservice teachers video production. Twenty-eight students in the first authors Social Foundations of the Elementary Curriculum course produced a 5 to 10 minute video as the major assignment for the class, interviews were conducted with six of the seven video production groups and the videos

Hayes, Michael T.; Petrie, Gina Mikel

2006-01-01

194

Development of advanced neutron/gamma generators for imaging and active interrogation applications  

NASA Astrophysics Data System (ADS)

We report here on the development of neutron and photon sources for use in imaging and active interrogation applications, where there is a growing urgency for more advanced interrogation tools. These devices include high yield D-D, D-T and T-T fusion reaction based neutron generators and also low energy nuclear reaction based high-energy gamma generators. One common feature in these various devices is the use of a high-efficiency, RF-induction discharge ion source. This discharge method provides high plasma density for high output current, high atomic species from molecular gases for high efficiency neutron or gamma generation and long lifetime. Predictable discharge characteristics of these plasma generators allow accurate modeling for both the beam dynamics and for the heat loads at the target spot. Current status of the neutron and gamma generator development with experimental data will be presented.

Reijonen, J.; Andresen, N.; Gicquel, F.; Gough, R.; King, M.; Kalvas, T.; Leung, K.-N.; Lou, T.-P.; Vainionpaa, H.; Antolak, A.; Morse, D.; Doyle, B.; Miller, G.; Piestrup, M.

2007-04-01

195

Advances in Thermal Spray Coatings for Gas Turbines and Energy Generation: A Review  

NASA Astrophysics Data System (ADS)

Functional coatings are widely used in energy generation equipment in industries such as renewables, oil and gas, propulsion engines, and gas turbines. Intelligent thermal spray processing is vital in many of these areas for efficient manufacturing. Advanced thermal spray coating applications include thermal management, wear, oxidation, corrosion resistance, sealing systems, vibration and sound absorbance, and component repair. This paper reviews the current status of materials, equipment, processing, and properties' aspects for key coatings in the energy industry, especially the developments in large-scale gas turbines. In addition to the most recent industrial advances in thermal spray technologies, future technical needs are also highlighted.

Hardwicke, Canan U.; Lau, Yuk-Chiu

2013-06-01

196

Advanced Fuel Cycle Initiative - Projected Linear Heat Generation Rate and Burnup Calculations  

SciTech Connect

This report provides documentation of the physics analysis performed to determine the linear heat generation rate (LHGR) and burnup calculations for the Advanced Fuel Cycle Initiative (AFCI) tests, AFC-1D, AFC-1H, and AFC-1G. The AFC-1D and AFC-1H tests consists of low-fertile metallic fuel compositions and the AFC-1G test consists of non-fertile and low-fertile nitride compositions. These tests will be irradiated in the East Flux Trap (EFT) positions E1, E2, and E3, respectively, during Advanced Test Reactor (ATR) Cycle 135B.

Richard G. Ambrosek; Gray S. Chang; Debbie J. Utterbeck

2005-02-01

197

Virtual Space Camp Video Game  

NASA Astrophysics Data System (ADS)

With advances in computers, graphics, and especially video games, manned space exploration can become real, by creating a safe, fun learning environment that allows players to explore the solar system from the comfort of their personal computers.

Speyerer, E. J.; Ferrari, K. A.; Lowes, L. L.; Raad, P. E.; Cuevas, T.; Purdy, J. A.

2006-03-01

198

Social Properties of Mobile Video  

NASA Astrophysics Data System (ADS)

Mobile video is now an everyday possibility with a wide array of commercially available devices, services, and content. These new technologies have created dramatic shifts in the way video-based media can be produced, consumed, and delivered by people beyond the familiar behaviors associated with fixed TV and video technologies. Such technology revolutions change the way users behave and change their expectations in regards to their mobile video experiences. Building upon earlier studies of mobile video, this paper reports on a study using diary techniques and ethnographic interviews to better understand how people are using commercially available mobile video technologies in their everyday lives. Drawing on reported episodes of mobile video behavior, the study identifies the social motivations and values underpinning these behaviors that help characterize mobile video consumption beyond the simplistic notion of viewing video only to kill time. This paper also discusses the significance of user-generated content and the usage of video in social communities through the description of two mobile video technology services that allow users to create and share content. Implications for adoption and design of mobile video technologies and services are discussed as well.

Mitchell, April Slayden; O'Hara, Kenton; Vorbau, Alex

199

CMOS image sensor with APS structure for high-speed video cameras  

Microsoft Academic Search

In this paper, we discuss the required specifications, APS (Active Pixel Sensor) technology, and possible problems to be overcome with next-generation CMOS image sensors for digital high-speed video photography. A custom-designed image sensor with parallel-readout, high-speed-operation and other functions, is needed to develop an advanced high-speed video camera, realizing higher frame rates and producing pictures of proper resolution. The CMOS

Kenji Tajima; Takashi Komuro; Masatoshi Ishikawa

2001-01-01

200

Technologies and system for automatic generation of advanced geo-spatial products with Chinese satellite imagery  

NASA Astrophysics Data System (ADS)

As an advanced technology, satellite remote sensing has been applied in a variety of fields and has brought numerous social benefits. This paper introduces a new operational satellite imagery processing system and conducts a case study using it by processing ZY-02C and ZY-3 satellite imagery. By way of this case study, this paper proposes a workflow involving the key generation technologies with fully automatic generation of advanced remote sensing products, such as the digital elevation model (DEM), the digital orthophoto map (DOM), and the high-resolution color-fused image. The proposed workflow in this system tackles the key practical issues related to the domestic satellite imagery process, such as low processing efficiency, low utilization, poor integration, etc. This system utilizes the following key generation technologies: automatic registration between the satellite imagery and the existing multi-geographic data, strip aerial triangulation of three-line array satellite images, multi-sensor image registration and fusion, dense matching of photogrammetric point clouds, and automatic correct splicing of wide range images. The proposed process system consists of two parts. The first part is the creation of a geographic information production mode with no manual intervention. This mode aims to improve the accuracy and efficiency of mass domestic satellite images to produce highly precise orientation by using global public basic geographic information databases like Map World, Google Earth, etc. The second part is the design of a workflow to ensure the stability of the production time and quality of domestic satellite imagery's advance product generation. Finally, this paper also discusses the accuracy of the process of image orientation and the precision of advanced products such as high-resolution color-fused image (ZY-02C), DEM (ZY-3), and DOM (ZY-3). The results show that the products of the proposed process system meet the requirements in both efficiency and quality, and the proposed process system is ready for future real-time domestic remote satellite imagery generation.

Zhang, Yongjun; Wang, Bo; Yu, Jin; Chen, Qi; Duan, Yansong; Zhang, Yong; Sun, Mingwei; Ji, Shunping

2014-05-01

201

Superresolution Algorithm to Video Surveillance System  

Microsoft Academic Search

\\u000a An application of a multiframe SR (superresolution) algorithm applied to video monitoring is described. The video signal generated\\u000a by various types of video cameras with different parameters and signal distortions which may be very problematic for superresolution\\u000a algorithms. The paper focuses on disadvantages in video signal which occur in video surveillance systems. Especially motion\\u000a estimation and its influence on superresolution

Tomasz Merta; Andrzej Czy?ewski

202

Interactive free viewpoint video from multiple stereo  

Microsoft Academic Search

We present a system for rendering free viewpoint video from data acquired by one or more stereo camera pairs in advance. The free viewpoint video can be observed standalone or shown embedded in a synthetic computer graphics scene. Compared to state-of-the art free viewpoint video applications less cameras are required. The system is scalable in terms of adding more stereo

Christian Weigel; Sebastian Schwarz; Torsten Korn; Martin Wallebohr

2009-01-01

203

System Support for Integrated Desktop Video Conferencing  

Microsoft Academic Search

Desktop computers are increasingly used as communications devices. Advances in digital media are making the integration of video into desktop computers practical, both technically and economically. At the convergence of these technologies is computer-integrated desktop video conferencing. This paper discusses the requirements of integrated desktop video conferencing on a networked set of multimedia- capable workstations. Among these requirements are the

Amy Pearl

1992-01-01

204

Advanced magnetic flux compression generator development issues: A comparison of coaxial and disk generators  

SciTech Connect

Three magnetic flux compression generator (FCG) geometries are reviewed and compared for their suitability as high-current, high-power drivers for z-pinch implosion programs at Los Alamos. They are the inside-out coaxial FCG, the disk FCG, and the outside-in coaxial FCG. A wide range of issues is discussed for each type FCG including current-carrying capability current densities, robustness, explosive mass and shape, initiation schemes, efficiency, operating times, complexity, and expense associated with development and fabrication. Equations are derived and used in simple scaling studies. The results of these studies are supported by MHD calculations and references to relevant experiments both here and in Russia. The inside-out coaxial FCG is shown to be suitable, both for the very high current applications and for anticipated future Trailmaster concepts. Based upon this analysis and results reported in the Russian literature, the inside-out coaxial FCG is more suitable than the disk FCG for the high-current applications considered, and the two are roughly equivalent when applied to lower-current Trailmaster concepts. The outside-in coaxial FCG is unsuitable for either application because of its limited current-carrying capability and the large investment required for initial development.

Sheppard, M.G.; Freeman, B.L.

1993-04-01

205

Nuclear Materials and Fuels Colloquium Presentations (Videos) from the Advanced Test Reactor National Scientific User Facility (ATR NSUF)  

DOE Data Explorer

DOE designated the Advanced Test Reactor and associated post-irradiation examination facilities a National Scientific User Facility (ATR NSUF) in April of 2007. This designation allows broader access to nuclear energy researchers, helping ensure the long-term viability of nuclear energy through a robust and sustained research and development effort. Researchers from universities, laboratories, and industry collaborating through the ATR NSUF will facilitate the prospect of advancements in basic and applied nuclear research and development to help meet the nation's energy security needs [Copied from http://atrnsuf.inl.gov/About/tabid/37/Default.aspx]. The ATR NSUF is located at Idaho National Laboratory. The list below contains just a sample of ATR colloquium presentations available for online viewing: • Multi-Modal Chemical Imaging at PNNL, Louis Terminello (32:39) • Using Art to Cultivate Positive Attention toward the Nuclear Energy Industry, Suzanne Hobbs (29:39) • Investigation of Mg0-Pyrochlore Composites and Spinel Compounds as Potential Inert Matrix Materials, Juan Nino, (50:20) • Graphite and Carbon Fiber Composite for High Temperature Core Application, Lance Snead (56:29) • Role of Oxidation Processes on PWSCC Initiation on Ni Base Alloys, Pierre Combrade (01: 25:14) • National Spherical Torus Experiment (NSTX) Research at Princeton Plasma Physics Laboratory, Lenka Kollar and Bryan Heim (01:35:49) • Ab Initio Modeling of Diffusion in Nuclear Materials, Dane Morgan (59:43) • Microstructural Evolution in Materials for Nuclear Applications, Megan Frary (51:45) • Hydride-induced Degradation of LWR Fuel Cladding and Assembly Components, Rob Daum (59:43) • Summary of Chinese Nuclear Power Program, Roger Staehle (59:43)

206

Representing videos in tangible products  

NASA Astrophysics Data System (ADS)

Videos can be taken with nearly every camera, digital point and shoot cameras, DSLRs as well as smartphones and more and more with so-called action cameras mounted on sports devices. The implementation of videos while generating QR codes and relevant pictures out of the video stream via a software implementation was contents in last years' paper. This year we present first data about what contents is displayed and how the users represent their videos in printed products, e.g. CEWE PHOTOBOOKS and greeting cards. We report the share of the different video formats used, the number of images extracted out of the video in order to represent the video, the positions in the book and different design strategies compared to regular books.

Fageth, Reiner; Weiting, Ralf

2014-03-01

207

Waterjet Videos  

NSDL National Science Digital Library

The Waterjet Video Vault contains clips of waterjet machines in action. The video of the foam cutting procedure is especially interesting, as it shows how quick and accurate the machining process can be. Other videos include a waterjet nozzle fired into the air; drawing up a part in CAD, making a tool path, then starting the cut; tilting the cutting head; and cutting 1/2" piece of aluminum. The videos require Windows Media Player, and a link for downloading it is available here.

2008-04-23

208

Video Compression  

NASA Technical Reports Server (NTRS)

Optivision developed two PC-compatible boards and associated software under a Goddard Space Flight Center Small Business Innovation Research grant for NASA applications in areas such as telerobotics, telesciences and spaceborne experimentation. From this technology, the company used its own funds to develop commercial products, the OPTIVideo MPEG Encoder and Decoder, which are used for realtime video compression and decompression. They are used in commercial applications including interactive video databases and video transmission. The encoder converts video source material to a compressed digital form that can be stored or transmitted, and the decoder decompresses bit streams to provide high quality playback.

1996-01-01

209

Laser velocimeter measurements of the flowfield generated by an advanced counterrotating propeller  

NASA Technical Reports Server (NTRS)

Results are presented of an investigation to measure the flowfield generated by an advanced counterrotating pusher propeller model similar to the full-scale Unducted Fan demonstrator engine. A laser Doppler velocimeter was used to measure the velocity field in several planes normal to the centerline of the model at axial stations upstream and downstream of each rotor. During this investigation, blades of the F4/A4 type were installed on the model which was operating in a freestream Mach 0.72 regime, with the advance ratio of each rotor set at 2.80. The measured data indicate only a slight influence of the potential field of each front rotor blade on the flowfield upstream of the rotor. The data measured downstream of the front rotor characterize the tip vortices, vortex sheets and potential field nonuniformities generated by the front rotor. The unsteadiness of the flow in the rotating frame of reference of the aft rotor is also illustrated.

Podboy, Gary G.; Krupar, Martin J.

1989-01-01

210

Selection of the reference steam generator for the advanced liquid metal reactor  

SciTech Connect

In February 2006 President Bush announced the Advanced Energy Initiative, which included the Department of Energy's (DOE) Global Nuclear Energy Partnership (GNEP). GNEP has seven broad goals; one of the major elements being to develop and deploy advanced nuclear fuel recycling technology that includes consuming spent nuclear fuel in an Advanced Recycling Reactor (ARR). DOE is contemplating accelerating the deployment of these technologies to achieve the construction of a commercial scale application of these technologies. DOE now defines this approach as 'two simultaneous tracks: (1) deployment of commercial scale facilities for which advanced technologies are available now or in the near future, and (2) further research and development of transmutation fuels technologies'. GEHitachi Nuclear Energy Americas LLC (GHNEA) believes an integrated technical solution is achievable in the near term to accelerate the commercial demonstration of GNEP infrastructure. The GHNEA ARR concept involves a single integrated recycling facility sized to service a single reactor module ARR capable of destroying light water and fast reactor sourced actinides. This paper describes the bases and rationale behind the selection of the helical coil steam generator (HCSG) as the reference steam generator concept for the ALMR and S-PRISM reactor concepts. (authors)

Loewen, Eric P.; Boardman, Chuck [GE-Hitachi Nuclear Energy Americas LLC, Wilmington, NC 28401 (United States)

2007-07-01

211

Testing of the Advanced Stirling Radioisotope Generator Engineering Unit at NASA Glenn Research Center  

NASA Technical Reports Server (NTRS)

The Advanced Stirling Radioisotope Generator (ASRG) is a high-efficiency generator being developed for potential use on a Discovery 12 space mission. Lockheed Martin designed and fabricated the ASRG Engineering Unit (EU) under contract to the Department of Energy. This unit was delivered to NASA Glenn Research Center in 2008 and has been undergoing extended operation testing to generate long-term performance data for an integrated system. It has also been used for tests to characterize generator operation while varying control parameters and system inputs, both when controlled with an alternating current (AC) bus and with a digital controller. The ASRG EU currently has over 27,000 hours of operation. This paper summarizes all of the tests that have been conducted on the ASRG EU over the past 3 years and provides an overview of the test results and what was learned.

Lewandowski, Edward J.

2013-01-01

212

Creep-fatigue effects in structural materials used in advanced nuclear power generating systems  

SciTech Connect

Various aspects of time-dependent fatigue behavior of a number of structural alloys in use or planned for use in advanced nuclear power generating systems are reviewed. Materials included are types 304 and 316 stainless steel, Fe-2 1/4 Cr-1 Mo steel, and alloy 800H. Examples of environmental effects, including both chemical and physical interaction, are presented for a number of environments. The environments discussed are high-purity liquid sodium, high vacuum, air, impure helium, and irradiation damage, including internal helium bubble generation.

Brinkman, C.R.

1980-01-01

213

Analytical investigation of thermal barrier coatings on advanced power generation gas turbines  

NASA Technical Reports Server (NTRS)

An analytical investigation of present and advanced gas turbine power generation cycles incorporating thermal barrier turbine component coatings was performed. Approximately 50 parametric points considering simple, recuperated, and combined cycles (including gasification) with gas turbine inlet temperatures from current levels through 1644K (2500 F) were evaluated. The results indicated that thermal barriers would be an attractive means to improve performance and reduce cost of electricity for these cycles. A recommended thermal barrier development program has been defined.

Amos, D. J.

1977-01-01

214

Applications study of advanced power generation systems utilizing coal-derived fuels, volume 2  

NASA Technical Reports Server (NTRS)

Technology readiness and development trends are discussed for three advanced power generation systems: combined cycle gas turbine, fuel cells, and magnetohydrodynamics. Power plants using these technologies are described and their performance either utilizing a medium-Btu coal derived fuel supplied by pipeline from a large central coal gasification facility or integrated with a gasification facility for supplying medium-Btu fuel gas is assessed.

Robson, F. L.

1981-01-01

215

Recent Patents and Advances in the Next-Generation Sequencing Technologies  

Microsoft Academic Search

We are now witnessing a new genomic revolution due to the arrival and continued advancements in the next- generation high-throughput sequencing technologies, which encompass sequencing by synthesis including fluorescent in situ sequencing (FISSEQ) and pyrosequencing, sequencing by ligation including using polony amplification and supported oligonucleotide detection (SOLiD), sequencing by hybridization in combination with sequencing-by-ligation and nanopore technology, nanopore sequencing and

Biaoyang Lin; Jun Wang; Yin Cheng

2008-01-01

216

Japanese Advanced Meteorological Imager: a next generation GEO imager for MTSAT-1R  

Microsoft Academic Search

The Japanese Advanced Meteorological Imager (JAMI) introduces next generation technology geosynchronous earth orbit (GEO) imagers for operational meteorological remote sensing. Raytheon Santa Barbara Remote Sensing is building JAMI for Space Systems\\/Loral as the imager subsystem for Japan's MTSAT-1R system. JAMI represents the best balance between heritage and newer space-qualified technology and meets all Japan Ministry of Transport MTSAT requirements from

Jeffery J. Puschell; Howard A. Lowe; James W. Jeter; Steven M. Kus; W. Todd Hurt; David Gilman; David L. Rogers; Roger L. Hoelter; Russ Ravella

2002-01-01

217

On the definition of adapted audio/video profiles for high-quality video calling services over LTE/4G  

NASA Astrophysics Data System (ADS)

During the last decade, the important advances and widespread availability of mobile technology (operating systems, GPUs, terminal resolution and so on) have encouraged a fast development of voice and video services like video-calling. While multimedia services have largely grown on mobile devices, the generated increase of data consumption is leading to the saturation of mobile networks. In order to provide data with high bit-rates and maintain performance as close as possible to traditional networks, the 3GPP (The 3rd Generation Partnership Project) worked on a high performance standard for mobile called Long Term Evolution (LTE). In this paper, we aim at expressing recommendations related to audio and video media profiles (selection of audio and video codecs, bit-rates, frame-rates, audio and video formats) for a typical video-calling services held over LTE/4G mobile networks. These profiles are defined according to targeted devices (smartphones, tablets), so as to ensure the best possible quality of experience (QoE). Obtained results indicate that for a CIF format (352 x 288 pixels) which is usually used for smartphones, the VP8 codec provides a better image quality than the H.264 codec for low bitrates (from 128 to 384 kbps). However sequences with high motion, H.264 in slow mode is preferred. Regarding audio, better results are globally achieved using wideband codecs offering good quality except for opus codec (at 12.2 kbps).

Ndiaye, Maty; Quinquis, Catherine; Larabi, Mohamed Chaker; Le Lay, Gwenael; Saadane, Hakim; Perrine, Clency

2014-01-01

218

Fast Scene Change Detection Using Direct Feature Extraction from MPEG Compressed Videos  

Microsoft Academic Search

In order to process video data efficiently, a video seg- mentation technique through scene change detection must be re- quired. This is a fundamental operation used in many digital video applications such as digital libraries, video on demand (VOD), etc. Many of these advanced video applications require manipulations of compressed video signals. So, the scene change detection process is achieved

Young-min Kim; Sung Woo Choi; Seong-whan Lee

2000-01-01

219

Proactive optimization of real-time video  

Microsoft Academic Search

In this paper, we introduce a new strategy for processing real-time video packets in programmable network nodes or active routers. We first discuss challenges in transmission of video streams over bandwidth-limited networks, followed by the active approach as an advance for streaming real-time video. In our model, each programmable node (or router) makes admission decision for video frames based on

Pham Van Tien

2005-01-01

220

Training Videos  

NSDL National Science Digital Library

The National Center for Case Study Teaching in Science has produced two videos that demonstrate how to teach science in a meaningful way using case studies in classroom discussions and small group learning. Both videos demonstrate how to effectively involve students in the learning process. They show real classes in action.

2010-01-01

221

Autism Risk Across Generations: A Population Based Study of Advancing Grandpaternal and Paternal Age  

PubMed Central

Context Advancing paternal age has been linked to autism. Objective To further expand knowledge about the relation between paternal age and autism by studying the effect of grandfathers’ age on childhood autism. Design Population-based multigenerational case-control study. Setting Nationwide Multi-Generation and Patient registers in Sweden. Participants We conducted a study of individuals born in Sweden since 1932. Parental age at birth was obtained for over 90% of the cohort. Grandparental age at the time of birth of the parent was obtained for a smaller subset (5,936 cases and 30,923 controls). Main Outcome Measures International Classification of Diseases (ICD) diagnosis of childhood autism in the Patient Registry. Results There was a statistically significant monotonic association between advancing grandpaternal age at the time of birth of the parent and risk of autism in grandchildren. Men who had a daughter when they were 50 or older were 1.79 times (95% confidence interval: 1.35-2.37, p<0.001) more likely to have a grandchild with autism, and men who had a son when they were 50 or older were 1.67 times (95% confidence interval: 1.35-2.37, p<0.001) more likely to have a grandchild with autism, compared to men who had children when they were 20-24, after controlling for birth year, sex, age of the spouse, family history of psychiatric disorders, highest family education and residential county. There was also a statistically significant monotonic association between advancing paternal age and risk of autism in the offspring. Sensitivity analyses indicated that these findings were not the result of bias due to missing data on grandparental age. Conclusion Advanced grandparental age was associated with increased risk of autism, suggesting that risk for autism could develop over generations. The results are consistent with mutations and/or epigenetic alterations associated with advancing paternal age.

Frans, Emma M; Sandin, Sven; Reichenberg, Abraham; Langstrom, Niklas; Lichtenstein, Paul; McGrath, John J; Hultman, Christina M

2013-01-01

222

The multispectral advanced volumetric real-time imaging compositor for real-time distributed scene generation  

NASA Astrophysics Data System (ADS)

AMRDEC has developed the Multi-spectral Advanced Volumetric Real-time Imaging Compositor (MAVRIC) prototype for distributed real-time hardware-in-the-loop (HWIL) scene generation. MAVRIC is a dynamic object-based energy conserved scene compositor that can seamlessly convolve distributed scene elements into temporally aligned physicsbased scenes for enhancing existing AMRDEC scene generation codes. The volumetric compositing process accepts input independent of depth order. This real-time compositor framework is built around AMRDEC's ContinuumCore API which provides the common messaging interface leveraging the Neutral Messaging Language (NML) for local, shared memory, reflective memory, network, and remote direct memory access (RDMA) communications and the Joint Signature Image Generator (JSIG) that provides energy conserved scene component interface at each render node. This structure allows for a highly scalable real-time environment capable of rendering individual objects at high fidelity while being considerate of real-time hardware-in-the-loop concerns, such as latency. As such, this system can be scaled to handle highly complex detailed scenes such as urban environments. This architecture provides the basis for common scene generation as it provides disparate scene elements to be calculated by various phenomenology codes and integrated seamlessly into a unified composited environment. This advanced capability is the gateway to higher fidelity scene generation such as ray-tracing. The high speed interconnects using PCI Express and InfiniBand were examined to support distributed scene generation whereby the scene graph, associated phenomenology, and the scene elements can be dynamically distributed across multiple high performance computing assets to maximize system performance.

Morris, Joseph W.; Ballard, Gary H.; Bunfield, Dennis H.; Peddycoart, Thomas E.; Trimble, Darian E.

2011-05-01

223

Development of a Power Electronics Controller for the Advanced Stirling Radioisotope Generator  

NASA Technical Reports Server (NTRS)

Under a U.S. Department of Energy program for radioisotope power systems, Lockheed Martin is developing an Engineering Unit of the Advanced Stirling Radioisotope Generator (ASRG). This is an advanced version of the previously reported SRG110 generator. The ASRG uses Advanced Stirling Convertors (ASCs) developed by Sunpower Incorporated under a NASA Research Announcement contract. The ASRG makes use of a Stirling controller based on power electronics that eliminates the tuning capacitors. The power electronics controller synchronizes dual-opposed convertors and maintains a fixed frequency operating point. The controller is single-fault tolerant and uses high-frequency pulse width modulation to create the sinusoidal currents that are nearly in phase with the piston velocity, eliminating the need for large series tuning capacitors. Sunpower supports this effort through an extension of their controller development intended for other applications. Glenn Research Center (GRC) supports this effort through system dynamic modeling, analysis and test support. The ASRG design arrived at a new baseline based on a system-level trade study and extensive feedback from mission planners on the necessity of single-fault tolerance. This paper presents the baseline design with an emphasis on the power electronics controller detailed design concept that will meet space mission requirements including single fault tolerance.

Leland, Douglas K.; Priest, Joel F.; Keiter, Douglas E.; Schreiber, Jeffrey G.

2008-01-01

224

Advanced Seal Technology Role in Meeting Next Generation Turbine Engine Goals  

NASA Technical Reports Server (NTRS)

Cycle studies have shown the benefits of increasing engine pressure ratios and cycle temperatures to decrease engine weight and improve performance in next generation turbine engines. Advanced seals have been identified as critical in meeting engine goals for specific fuel consumption, thrust-to-weight, emissions, durability and operating costs. NASA and the industry are identifying and developing engine and sealing technologies that will result in dramatic improvements and address the goals for engines entering service in the 2005-2007 time frame. This paper provides an overview of advanced seal technology requirements and highlights the results of a preliminary design effort to implement advanced seals into a regional aircraft turbine engine. This study examines in great detail the benefits of applying advanced seals in the high pressure turbine region of the engine. Low leakage film-riding seals can cut in half the estimated 4% cycle air currently used to purge the high pressure turbine cavities. These savings can be applied in one of several ways. Holding rotor inlet temperature (RIT) constant the engine specific fuel consumption can be reduced 0.9%, or thrust could be increased 2.5%, or mission fuel burn could be reduced 1.3%. Alternatively, RIT could be lowered 20 'F resulting in a 50% increase in turbine blade life reducing overall regional aircraft maintenance and fuel bum direct operating costs by nearly 1%. Thermal, structural, secondary-air systems, safety (seal failure and effect), and emissions analyses have shown the proposed design is feasible.

Steinetz, Bruce M.; Hendricks, Robert C.; Munson, John

1999-01-01

225

Metadata in video databases  

Microsoft Academic Search

Video is composed of audio-visual information. Providing content based access to video data is essential for the sucessful integration of video into computers. Organizing video for content based access requires the use of video metadata. This paper explores the nature video metadata. A data model for video databases is presented based on a study of the applications of video, the

Ramesh Jain; Arun Hampapur

1994-01-01

226

System identification to characterize human use of ethanol based on generative point-process models of video games with ethanol rewards.  

PubMed

The influence of family history and genetics on the risk for the development of abuse or dependence is a major theme in alcoholism research. Recent research have used endophenotypes and behavioral paradigms to help detect further genetic contributions to this disease. Electronic tasks, essentially video games, which provide alcohol as a reward in controlled environments and with specified exposures have been developed to explore some of the behavioral and subjective characteristics of individuals with or at risk for alcohol substance use disorders. A generative model (containing parameters with unknown values) of a simple game involving a progressive work paradigm is described along with the associated point process signal processing that allows system identification of the model. The system is demonstrated on human subject data. The same human subject completing the task under different circumstances, e.g., with larger and smaller alcohol reward values, is assigned different parameter values. Potential meanings of the different parameter values are described. PMID:22254898

Ozil, Ipek; Plawecki, Martin H; Doerschuk, Peter C; O'Connor, Sean J

2011-01-01

227

Advanced natural gas-fired turbine system utilizing thermochemical recuperation and/or partial oxidation for electricity generation, greenfield and repowering applications.  

National Technical Information Service (NTIS)

The performance, economics and technical feasibility of heavy duty combustion turbine power systems incorporating two advanced power generation schemes have been estimated to assess the potential merits of these advanced technologies. The advanced technol...

1997-01-01

228

The Advanced Light Source: A third-generation Synchrotron Radiation Source  

SciTech Connect

The Advanced Light Source (ALS) at the E.O. Lawrence Berkeley National Laboratory (Berkeley Lab) of the University of California is a ''third-generation'' synchrotron radiation source optimized for highest brightness at ultraviolet and soft x-ray photon energies. It also provides world-class performance at hard x-ray photon energies. Berkeley Lab operates the ALS for the United States Department of Energy as a national user facility that is available 24 hours/day around the year for research by scientists from industrial, academic, and government laboratories primarily from the United States but also from abroad.

Robinson, Arthur L.

2002-08-14

229

Advanced properties of extended plasmas for efficient high-order harmonic generation  

NASA Astrophysics Data System (ADS)

We demonstrate the advanced properties of extended plasma plumes (5 mm) for efficient harmonic generation of laser radiation compared with the short lengths of plasmas (˜0.3-0.5 mm) used in previous studies. The harmonic conversion efficiency quadratically increased with the growth of plasma length. The studies of this process along the whole extreme ultraviolet range using the long plasma jets produced on various metal surfaces, particularly including the resonance-enhanced laser frequency conversion and two-color pump, are presented. Such plasmas could be used for the quasi-phase matching experiments by proper modulation of the spatial characteristics of extended ablating area and formation of separated plasma jets.

Ganeev, R. A.; Suzuki, M.; Kuroda, H.

2014-05-01

230

Monolithic solid oxide fuel cell technology advancement for coal- based power generation. Quarterly report, December 1991  

SciTech Connect

The program is conducted by a team consisting of AiResearch Los Angeles Division of Allied-Signal Aerospace Company and Argonne National Laboratory (ANL). The objective of the program is to advance materials and fabrication methodologies to develop a monolithic solid oxide fuel cell (MSOFC) system capable of meeting performance, life, and cost goals for coal-based power generation. The program focuses on materials research and development, fabrication process development, cell/stack performance testing and characterization, cost and system analysis, and quality development.

Not Available

1992-01-15

231

Monolithic solid oxide fuel cell technology advancement for coal- based power generation  

SciTech Connect

The program is conducted by a team consisting of AiResearch Los Angeles Division of Allied-Signal Aerospace Company and Argonne National Laboratory (ANL). The objective of the program is to advance materials and fabrication methodologies to develop a monolithic solid oxide fuel cell (MSOFC) system capable of meeting performance, life, and cost goals for coal-based power generation. The program focuses on materials research and development, fabrication process development, cell/stack performance testing and characterization, cost and system analysis, and quality development.

Not Available

1992-01-15

232

Generation of optimum vertical profiles for an advanced flight management system  

NASA Technical Reports Server (NTRS)

Algorithms for generating minimum fuel or minimum cost vertical profiles are derived and examined. The option for fixing the time of flight is included in the concepts developed. These algorithms form the basis for the design of an advanced on-board flight management system. The variations in the optimum vertical profiles (resulting from these concepts) due to variations in wind, takeoff mass, and range-to-destination are presented. Fuel savings due to optimum climb, free cruise altitude, and absorbing delays enroute are examined.

Sorensen, J. A.; Waters, M. H.

1981-01-01

233

Video flowmeter  

DOEpatents

A video flowmeter is described that is capable of specifying flow nature and pattern and, at the same time, the quantitative value of the rate of volumetric flow. An image of a determinable volumetric region within a fluid containing entrained particles is formed and positioned by a rod optic lens assembly on the raster area of a low-light level television camera. The particles are illuminated by light transmitted through a bundle of glass fibers surrounding the rod optic lens assembly. Only particle images having speeds on the raster area below the raster line scanning speed may be used to form a video picture which is displayed on a video screen. The flowmeter is calibrated so that the locus of positions of origin of the video picture gives a determination of the volumetric flow rate of the fluid. 4 figs.

Lord, D.E.; Carter, G.W.; Petrini, R.R.

1983-08-02

234

Video flowmeter  

DOEpatents

A video flowmeter is described that is capable of specifying flow nature and pattern and, at the same time, the quantitative value of the rate of volumetric flow. An image of a determinable volumetric region within a fluid (10) containing entrained particles (12) is formed and positioned by a rod optic lens assembly (31) on the raster area of a low-light level television camera (20). The particles (12) are illuminated by light transmitted through a bundle of glass fibers (32) surrounding the rod optic lens assembly (31). Only particle images having speeds on the raster area below the raster line scanning speed may be used to form a video picture which is displayed on a video screen (40). The flowmeter is calibrated so that the locus of positions of origin of the video picture gives a determination of the volumetric flow rate of the fluid (10).

Lord, David E. (Livermore, CA); Carter, Gary W. (Livermore, CA); Petrini, Richard R. (Livermore, CA)

1983-01-01

235

Daylighting Video  

NSDL National Science Digital Library

This video introduces the concept of daylighting - the use of windows or skylights for natural lighting and temperature regulation - and how it is one building strategy that can save operating costs for homeowners and businesses.

Energy, Us D.

236

Video flowmeter  

DOEpatents

A video flowmeter is described that is capable of specifying flow nature and pattern and, at the same time, the quantitative value of the rate of volumetric flow. An image of a determinable volumetric region within a fluid containing entrained particles is formed and positioned by a rod optic lens assembly on the raster area of a low-light level television camera. The particles are illuminated by light transmitted through a bundle of glass fibers surrounding the rod optic lens assembly. Only particle images having speeds on the raster area below the raster line scanning speed may be used to form a video picture which is displayed on a video screen. The flowmeter is calibrated so that the locus of positions of origin of the video picture gives a determination of the volumetric flow rate of the fluid.

Lord, D.E.; Carter, G.W.; Petrini, R.R.

1981-06-10

237

Advanced Microsensors  

NASA Technical Reports Server (NTRS)

This video looks at a spinoff application of the technology from advanced microsensors -- those that monitor and determine conditions of spacecraft like the Space Shuttle. The application featured is concerned with the monitoring of the health of premature babies.

1991-01-01

238

Great Lakes Bioenergy Research Center's Video Channel on Vimeo  

DOE Data Explorer

The Great Lakes Bioenergy Research Center (GLBRC) is one of three bioenergy science centers funded by the Office of Biological and Environmental Research in the Office of Science. The centers pursue research supporting high-risk, high-return biological solutions for bioenergy applications. GLBRC's mission is to perform basic research that generates technology to convert cellulosic biomass to ethanol and other advanced biofuels. The Vimeo channel for GLBRC has 22 videos as of May 2012.

239

Next Generation Risk Assessment: Incorporation of Recent Advances in Molecular, Computational, and Systems Biology (External Review Draft)  

EPA Science Inventory

EPA is releasing a draft report "Next Generation Risk Assessment: Incorporation of Recent Advances in Molecular, Computational, and Systems Biology" that explores how new molecular, computational and systems biology data and approaches (together called "NexGen") could better info...

240

Gabor Difference Analysis of Digital Video Quality  

Microsoft Academic Search

The rapid increase in the development of digital video systems has generated a strong need for objective video quality metrics. Two methods are presented in this work. One is the Gabor difference analysis (GDA) full reference method, and the other is the reverse frame prediction (RFP) no reference video quality method. Both methods are based on the multi-channel properties of

Jing Guo; Michele Van Dyke-Lewis; H. R. Myler

2004-01-01

241

A General Optimal Video Smoothing Algorithm  

Microsoft Academic Search

Video smoothing is a promising technique for reducing the bandwidth variability of video in order to improve net- work eficiency. This paper presents a general optimal video smoothing algorithm based on the concept of dynamic pro- gramming. The algorithm generates the optimum transmis- sion schedule for difierent requirements by setting the con- straints and the cost function accordingly. It can

Zhimei Jiang; Leonard Kleinrock

1998-01-01

242

Advanced Development Projects for Constellation From The Next Generation Launch Technology Program Elements  

NASA Technical Reports Server (NTRS)

When United States President George W. Bush announced the Vision for Space Exploration in January 2004, twelve propulsion and launch system projects were being pursued in the Next Generation Launch Technology (NGLT) Program. These projects underwent a review for near-term relevance to the Vision. Subsequently, five projects were chosen as advanced development projects by NASA s Exploration Systems Mission Directorate (ESMD). These five projects were Auxiliary Propulsion, Integrated Powerhead Demonstrator, Propulsion Technology and Integration, Vehicle Subsystems, and Constellation University Institutes. Recently, an NGLT effort in Vehicle Structures was identified as a gap technology that was executed via the Advanced Development Projects Office within ESMD. For all of these advanced development projects, there is an emphasis on producing specific, near-term technical deliverables related to space transportation that constitute a subset of the promised NGLT capabilities. The purpose of this paper is to provide a brief description of the relevancy review process and provide a status of the aforementioned projects. For each project, the background, objectives, significant technical accomplishments, and future plans will be discussed. In contrast to many of the current ESMD activities, these areas are providing hardware and testing to further develop relevant technologies in support of the Vision for Space Exploration.

Huebner, Lawrence D.; Saiyed, Naseem H.; Swith, Marion Shayne

2005-01-01

243

The Next Generation Nuclear Plant/Advanced Gas Reactor Fuel Irradiation Experiments in the Advanced Test Reactor  

SciTech Connect

The United States Department of Energy’s Next Generation Nuclear Plant (NGNP) Program will be irradiating eight separate low enriched uranium (LEU) tri-isotopic (TRISO) particle fuel (in compact form) experiments in the Advanced Test Reactor (ATR) located at the Idaho National Laboratory (INL). The ATR has a long history of irradiation testing in support of reactor development and the INL has been designated as the new United States Department of Energy’s lead laboratory for nuclear energy development. The ATR is one of the world’s premiere test reactors for performing long term, high flux, and/or large volume irradiation test programs. These irradiations and fuel development are being accomplished to support development of the next generation reactors in the United States, and will be irradiated over the next ten years to demonstrate and qualify new particle fuel for use in high temperature gas reactors. The goals of the irradiation experiments are to provide irradiation performance data to support fuel process development, to qualify fuel for normal operating conditions, to support development and validation of fuel performance and fission product transport models and codes, and to provide irradiated fuel and materials for post irradiation examination (PIE) and safety testing. The experiments, which will each consist of at least six separate capsules, will be irradiated in an inert sweep gas atmosphere with individual on-line temperature monitoring and control of each capsule. The sweep gas will also have on-line fission product monitoring on its effluent to track performance of the fuel in each individual capsule during irradiation. The first experiment (designated AGR-1) started irradiation in December 2006, and the second experiment (AGR-2) is currently in the design phase. The design of test trains, as well as the support systems and fission product monitoring system that will monitor and control the experiment during irradiation will be discussed. In addition, the purpose and differences between the two experiments will be compared and the irradiation results to date on the first experiment will be presented.

S. Blaine Grover

2009-09-01

244

SCME Videos by Students  

NSDL National Science Digital Library

The Southwest Center for Microsystems Education is a Regional Advanced Technology Education Center funded in part by the National Science Foundation. This page contains a collection of videos made by students on MEMS related topics. The topics include a virtual cleanroom tour, gowning procedures, and using personal protective equipment. Visitors are encouraged to create an account and login in order to access the full set of resources.

2011-10-11

245

Aesthetics-Based Automatic Home Video Skimming System  

Microsoft Academic Search

In this paper, we propose an automatic home video skimming system based on media aesthetics. Unlike other similar works, the\\u000a proposed system considers video editing theory and realizes the idea of computational media aesthetics. Given a home video\\u000a and a incidental background music, this system generates a music video (MV) style skimming video automatically, with consideration\\u000a of video quality, music

Wei-ting Peng; Yueh-hsuan Chiang; Wei-ta Chu; Wei-jia Huang; Wei-lun Chang; Po-chung Huang; Yi-ping Hung

2008-01-01

246

Watermarking of free-view video.  

PubMed

With the advances in image based rendering (IBR) in recent years, generation of a realistic arbitrary view of a scene from a number of original views has become cheaper and faster. One of the main applications of this progress has emerged as free-view TV(FTV), where TV-viewers select freely the viewing position and angle via IBR on the transmitted multiview video. Noting that the TV-viewer might record a personal video for this arbitrarily selected view and misuse this content, it is apparent that copyright and copy protection problems also exist and should be solved for FTV. In this paper, we focus on this newly emerged problem by proposing a watermarking method for free-view video. The watermark is embedded into every frame of multiple views by exploiting the spatial masking properties of the human visual system. Assuming that the position and rotation of the virtual camera is known, the proposed method extracts the watermark successfully from an arbitrarily generated virtual image. In order to extend the method for the case of an unknown virtual camera position and rotation, the transformations on the watermark pattern due to image based rendering operations are analyzed. Based upon this analysis, camera position and homography estimation methods are proposed for the virtual camera. The encouraging simulation results promise not only a novel method, but also a new direction for watermarking research. PMID:20215072

Koz, Alper; Cigla, Cevahir; Alatan, A Aydin

2010-07-01

247

A computer-aided telescope pointing system utilizing a video star tracker  

NASA Technical Reports Server (NTRS)

The Video Inertial Pointing (VIP) System is being developed to satisfy the acquisition and pointing requirements of astronomical telescopes. VIP employs a single video sensor to generate three-axis pointing error signals and to provide inputs for a cathode ray tube (CRT) display of the star field. The pointing error signals update the telescope's gyro stabilization system. The CRT display facilitates target acquisition and positioning of the telescope by a remote operator. The present paper describes the analysis, simulation, and hardware development of a prototype, advanced VIP system. An early model of the system utilizing a silicon-intensified target vidicon camera has flown on a balloon-borne telescope and is briefly described. The advanced system, which can employ either a vidicon camera or a charge-coupled device video sensor, has been tested using an analog/digital hybrid simulation. The advanced VIP hardware is described, and the simulation results presented.

Lorell, K. R.; Murphy, J. P.; Swift, C. D.

1976-01-01

248

A two-step method for compression of medical monitoring video  

Microsoft Academic Search

Video monitoring is often conducted in hospitals. In case of prolonged monitoring, huge amounts of data are generated. There is a high demand for very efficient video compression methods. The current medical video systems utilize standard compression algorithms such as MPEG-1 and MPEG-2, which were designed for generic video rather than medical video. The features of this type of video

Qiang Liu; R. J. Sclabassi; Mark L. Scheuer; Mingui Sun

2003-01-01

249

Advanced Soldier Thermoelectric Power System for Power Generation from Battlefield Heat Sources  

SciTech Connect

The U.S. military uses large amounts of fuel during deployments and battlefield operations. This project sought to develop a lightweight, small form-factor, soldier-portable advanced thermoelectric (TE) system prototype to recover and convert waste heat from various deployed military equipment (i.e., diesel generators/engines, incinerators, vehicles, and potentially mobile kitchens), with the ultimate purpose of producing power for soldier battery charging, advanced capacitor charging, and other battlefield power applications. The technical approach employed microchannel technology, a unique “power panel” approach to heat exchange/TE system integration, and newly-characterized LAST (lead-antimony-silver-telluride) and LASTT (lead-antimony-silver-tin-telluride) TE materials segmented with bismuth telluride TE materials in designing a segmented-element TE power module and system. This project researched never-before-addressed system integration challenges (thermal expansion, thermal diffusion, electrical interconnection, thermal and electrical interfaces) of designing thin “power panels” consisting of alternating layers of thin, microchannel heat exchangers (hot and cold) sandwiching thin, segmented-element TE power generators. The TE properties, structurally properties, and thermal fatigue behavior of LAST and LASTT materials were developed and characterized such that the first segmented-element TE modules using LAST / LASTT materials were fabricated and tested at hot-side temperatures = 400 °C and cold-side temperatures = 40 °C. LAST / LASTT materials were successfully segmented with bismuth telluride and electrically interconnected with diffusion barrier materials and copper strapping within the module electrical circuit. A TE system design was developed to produce 1.5-1.6 kW of electrical energy using these new TE modules from the exhaust waste heat of 60-kW Tactical Quiet Generators as demonstration vehicles.

Hendricks, Terry J.; Hogan, Tim; Case, Eldon D.; Cauchy, Charles J.

2010-09-01

250

Video-based crowd synthesis.  

PubMed

As a controllable medium, video-realistic crowds are important for creating the illusion of a populated reality in special effects, games, and architectural visualization. While recent progress in simulation and motion captured-based techniques for crowd synthesis has focused on natural macroscale behavior, this paper addresses the complementary problem of synthesizing crowds with realistic microscale behavior and appearance. Example-based synthesis methods such as video textures are an appealing alternative to conventional model-based methods, but current techniques are unable to represent and satisfy constraints between video sprites and the scene. This paper describes how to synthesize crowds by segmenting pedestrians from input videos of natural crowds and optimally placing them into an output video while satisfying environmental constraints imposed by the scene. We introduce crowd tubes, a representation of video objects designed to compose a crowd of video billboards while avoiding collisions between static and dynamic obstacles. The approach consists of representing crowd tube samples and constraint violations with a conflict graph. The maximal independent set yields a dense constraint-satisfying crowd composition. We present a prototype system for the capture, analysis, synthesis, and control of video-based crowds. Several results demonstrate the system's ability to generate videos of crowds which exhibit a variety of natural behaviors. PMID:24029912

Flagg, Matthew; Rehg, James M

2013-11-01

251

Color Helmet Mounted Display System with Real Time Computer Generated and Video Imagery for In-Flight Simulation  

NASA Technical Reports Server (NTRS)

NASA Ames Research Center and the US Army are developing the Rotorcraft Aircrew Systems Concepts Airborne Laboratory (RASCAL) using a Sikorsky UH-60 helicopter for the purpose of flight systems research. A primary use of the RASCAL is in-flight simulation for which the visual scene will use computer generated imagery and synthetic vision. This research is made possible in part to a full color wide field of view Helmet Mounted Display (HMD) system that provides high performance color imagery suitable for daytime operations in a flight-rated package. This paper describes the design and performance characteristics of the HMD system. Emphasis is placed on the design specifications, testing, and integration into the aircraft of Kaiser Electronics' RASCAL HMD system that was designed and built under contract for NASA. The optical performance and design of the Helmet mounted display unit will be discussed as well as the unique capabilities provided by the system's Programmable Display Generator (PDG).

Sawyer, Kevin; Jacobsen, Robert; Aiken, Edwin W. (Technical Monitor)

1995-01-01

252

Advanced oxidation protein products are generated by bovine neutrophils and inhibit free radical production in vitro.  

PubMed

Despite the recognised importance of oxidative stress in the health and immune function of dairy cows, protein oxidation markers have been poorly studied in this species. The current study aimed to characterise markers of protein oxidation generated by activated bovine neutrophils and investigate the biological effects of advanced oxidation protein products (AOPP) on bovine neutrophils. Markers of protein oxidation (AOPP, dityrosines and carbonyls) were measured in culture medium containing bovine serum albumin (BSA) exposed to neutrophils. The effect of AOPP-BSA on generation of reactive oxygen species (ROS) was assessed by chemiluminescence. Activation of caspases-3, -8 and -9 and the presence of DNA laddering were used as apoptosis markers. Greater amounts of AOPP were generated by phorbol myristate acetate (PMA)-activated than non-activated neutrophils (1.46 ± 0.13 vs. 0.75 ± 0.13 nmol/mg protein, respectively; P<0.05). Activated neutrophils and hypochlorous acid generated slightly different patterns of oxidized protein markers. Exposure to AOPP-BSA did not stimulate ROS production. Activated neutrophils generated a lesser amount of ROS when incubated with AOPP-BSA (P<0.001). Activation with PMA induced a loss of viable neutrophils after 3h, which was greater with AOPP-BSA incubation (P<0.05). Detectable amounts of active caspases-3, -8 and -9 were found in nearly all samples but differences in caspase activation or DNA laddering were not observed comparing treatment groups. Apoptosis was unlikely to be responsible for the greater loss of PMA-activated neutrophils cultured in AOPP-BSA and it is possible that primary necrosis occurred. The results suggest that accumulation of oxidized proteins at an inflammatory site might result in a progressive reduction of neutrophil viability. PMID:24291143

Bordignon, Milena; Da Dalt, Laura; Marinelli, Lieta; Gabai, Gianfranco

2014-01-01

253

Video Nation  

NSDL National Science Digital Library

The British have long been interested in studying and documenting various forms of social organization and human interaction, and their much-revered BBC has also been involved in letting residents have their say on a number of programs, including the notable âÂÂVideo NationâÂÂ. The program started in the early 1990s, and with the rise of the Internet many of these short vignettes have been folded into this very informative and engaging website. With eighteen regional centers, visitors can view videos from such locations as Kent, Birmingham, and Manchester. Visitors looking for videos on certain topics can delve into the Archive section and look through headings such as Africa, football, lomography, and summer. Other sections of the site allow users to learn more about making a short film and the history of the Video Nation program.

254

Ionic carbamate photoacid/photobase generators for the advancement of dual-tone photolithography  

NASA Astrophysics Data System (ADS)

Current work in lithographic patterning has been carried out using 193 nm excitation sources, limiting the pitch division to approximately ?/2 and, thus, the advancement of Moore's law. Recently, double patterning has emerged as a potential extension of 193 nm techniques as two lines can be patterned in one exposure. In this contribution, the double patterning features of single component carbamate photoacid/photobase generators (PAG/PBG) are examined. At lower exposure doses, sulfonic acid is generated, while at higher doses, a photochemical rearrangement is initiated to activate the PBG. Optimally, at intermediate doses, photoacid and photobase components can exist concurrently resulting in the desired dual tone lithographic features. The energy required to initiate dual tone behavior can be tailored through co-added amine quenchers and carbamate concentration. Using ellipsometry, the energy required for the resists to have the first sign of photoacid generation (film dissolution), E0, and at the energy required for photobase activation (En) were determined, as this value dictates the ability to achieve the desired pitch division.

Hallett-Tapley, Geniece L.; Wee, Tse-Luen; Eldo, Joby; Jackson, Edward A.; Blackwell, James M.; Scaiano, Juan C.

2012-03-01

255

Adaptive Critic Design for Energy Minimization of Portable Video Communication Devices  

Microsoft Academic Search

Portable video communication devices operate on batteries with limited energy supply. Video compression is computationally intensive and energy-demanding. Therefore, one critical issue in portable video communication system design is to minimize the energy consumption of video encoding so as to prolong the operational lifetime of portable video devices. In this paper, we explore advanced methods in adaptive system control and

Zhao Sun; Xi Chen; Zhihai He

2010-01-01

256

Statistical metrology-measurement and modeling of variation for advanced process development and design rule generation  

NASA Astrophysics Data System (ADS)

Advanced process technology will require more detailed understanding and tighter control of variation in devices and interconnects. The purpose of statistical metrology is to provide methods to measure and characterize variation, to model systematic and random components of that variation, and to understand the impact of variation on both yield and performance of advanced circuits. Of particular concern are spatial or pattern-dependencies within individual chips; such systematic variation within the chip can have a much larger impact on performance than wafer-level random variation. Statistical metrology methods will play an important role in the creation of design rules for advanced technologies. For example, a key issue in multilayer interconnect is the uniformity of interlevel dielectric (ILD) thickness within the chip. For the case of ILD thickness, we describe phases of statistical metrology development and application to understanding and modeling thickness variation arising from chemical-mechanical polishing (CMP). These phases include screening experiments including design of test structures and test masks to gather electrical or optical data, techniques for statistical decomposition and analysis of the data, and approaches to calibrating empirical and physical variation models. These models can be integrated with circuit CAD tools to evaluate different process integration or design rule strategies. One focus for the generation of interconnect design rules are guidelines for the use of ``dummy fill'' or ``metal fill'' to improve the uniformity of underlying metal density and thus improve the uniformity of oxide thickness within the die. Trade-offs that can be evaluated via statistical metrology include the improvements to uniformity possible versus the effect of increased capacitance due to additional metal.

Boning, Duane S.; Chung, James E.

1998-11-01

257

NASA's Advanced Propulsion Technology Activities for Third Generation Fully Reusable Launch Vehicle Applications  

NASA Technical Reports Server (NTRS)

NASA's Office of Aeronautics and Space Transportation Technology (OASTT) established the following three major goals, referred to as "The Three Pillars for Success": Global Civil Aviation, Revolutionary Technology Leaps, and Access to Space. The Advanced Space Transportation Program Office (ASTP) at the NASA's Marshall Space Flight Center in Huntsville, Ala. focuses on future space transportation technologies under the "Access to Space" pillar. The Propulsion Projects within ASTP under the investment area of Spaceliner100, focus on the earth-to-orbit (ETO) third generation reusable launch vehicle technologies. The goals of Spaceliner 100 is to reduce cost by a factor of 100 and improve safety by a factor of 10,000 over current conditions. The ETO Propulsion Projects in ASTP, are actively developing combination/combined-cycle propulsion technologies that utilized airbreathing propulsion during a major portion of the trajectory. System integration, components, materials and advanced rocket technologies are also being pursued. Over the last several years, one of the main thrusts has been to develop rocket-based combined cycle (RBCC) technologies. The focus has been on conducting ground tests of several engine designs to establish the RBCC flowpaths performance. Flowpath testing of three different RBCC engine designs is progressing. Additionally, vehicle system studies are being conducted to assess potential operational space access vehicles utilizing combined-cycle propulsion systems. The design, manufacturing, and ground testing of a scale flight-type engine are planned. The first flight demonstration of an airbreathing combined cycle propulsion system is envisioned around 2005. The paper will describe the advanced propulsion technologies that are being being developed under the ETO activities in the ASTP program. Progress, findings, and future activities for the propulsion technologies will be discussed.

Hueter, Uwe

2000-01-01

258

Battery-free Wireless Sensor Network For Advanced Fossil-Fuel Based Power Generation  

SciTech Connect

This report summarizes technical progress achieved during the project supported by the Department of Energy under Award Number DE-FG26-07NT4306. The aim of the project was to conduct basic research into battery-free wireless sensing mechanism in order to develop novel wireless sensors and sensor network for physical and chemical parameter monitoring in a harsh environment. Passive wireless sensing platform and five wireless sensors including temperature sensor, pressure sensor, humidity sensor, crack sensor and networked sensors developed and demonstrated in our laboratory setup have achieved the objective for the monitoring of various physical and chemical parameters in a harsh environment through remote power and wireless sensor communication, which is critical to intelligent control of advanced power generation system. This report is organized by the sensors developed as detailed in each progress report.

Yi Jia

2011-02-28

259

Advanced Stirling Radioisotope Generator Thermal Power Model in Thermal Desktop SINDA/FLUINT Analyzer  

NASA Technical Reports Server (NTRS)

This paper presents a three-dimensional Advanced Stirling Radioisotope Generator (ASRG) thermal power model that was built using the Thermal Desktop SINDA/FLUINT thermal analyzer. The model was correlated with ASRG engineering unit (EU) test data and ASRG flight unit predictions from Lockheed Martin's Ideas TMG thermal model. ASRG performance under (1) ASC hot-end temperatures, (2) ambient temperatures, and (3) years of mission for the general purpose heat source fuel decay was predicted using this model for the flight unit. The results were compared with those reported by Lockheed Martin and showed good agreement. In addition, the model was used to study the performance of the ASRG flight unit for operations on the ground and on the surface of Titan, and the concept of using gold film to reduce thermal loss through insulation was investigated.

Wang, Xiao-Yen; Fabanich, William A.; Schmitz, Paul C.

2012-01-01

260

Structured background grids for generation of unstructured grids by advancing front method  

NASA Technical Reports Server (NTRS)

A new method of background grid construction is introduced for generation of unstructured tetrahedral grids using the advancing-front technique. Unlike the conventional triangular/tetrahedral background grids which are difficult to construct and usually inadequate in performance, the new method exploits the simplicity of uniform Cartesian meshes and provides grids of better quality. The approach is analogous to solving a steady-state heat conduction problem with discrete heat sources. The spacing parameters of grid points are distributed over the nodes of a Cartesian background grid by interpolating from a few prescribed sources and solving a Poisson equation. To increase the control over the grid point distribution, a directional clustering approach is used. The new method is convenient to use and provides better grid quality and flexibility. Sample results are presented to demonstrate the power of the method.

Pirzadeh, Shahyar

1991-01-01

261

Application of next-generation sequencing in clinical oncology to advance personalized treatment of cancer  

PubMed Central

With the development and improvement of new sequencing technology, next-generation sequencing (NGS) has been applied increasingly in cancer genomics research over the past decade. More recently, NGS has been adopted in clinical oncology to advance personalized treatment of cancer. NGS is used to identify novel and rare cancer mutations, detect familial cancer mutation carriers, and provide molecular rationale for appropriate targeted therapy. Compared to traditional sequencing, NGS holds many advantages, such as the ability to fully sequence all types of mutations for a large number of genes (hundreds to thousands) in a single test at a relatively low cost. However, significant challenges, particularly with respect to the requirement for simpler assays, more flexible throughput, shorter turnaround time, and most importantly, easier data analysis and interpretation, will have to be overcome to translate NGS to the bedside of cancer patients. Overall, continuous dedication to apply NGS in clinical oncology practice will enable us to be one step closer to personalized medicine.

Guan, Yan-Fang; Li, Gai-Rui; Wang, Rong-Jiao; Yi, Yu-Ting; Yang, Ling; Jiang, Dan; Zhang, Xiao-Ping; Peng, Yin

2012-01-01

262

A Plan for Advanced Guidance and Control Technology for 2nd Generation Reusable Launch Vehicles  

NASA Technical Reports Server (NTRS)

Advanced guidance and control (AG&C) technologies are critical for meeting safety/reliability and cost requirements for the next generation of reusable launch vehicle (RLV). This becomes clear upon examining the number of expendable launch vehicle failures in the recent past where AG&C technologies would have saved a RLV with the same failure mode, the additional vehicle problems where this technology applies, and the costs associated with mission design with or without all these failure issues. The state-of-the-art in guidance and control technology, as well as in computing technology, is at the point where we can took to the possibility of being able to safely return a RLV in any situation where it can physically be recovered. This paper outlines reasons for AG&C, current technology efforts, and the additional work needed for making this goal a reality.

Hanson, John M.; Fogle, Frank (Technical Monitor)

2002-01-01

263

A New Era of the Vaginal Microbiome: Advances using Next-Generation Sequencing  

PubMed Central

Until recently, bacterial species that inhabit the human vagina have been primarily studied using organism-centric approaches. Understanding how these bacterial species interact with each other and the host vaginal epithelium is essential for a more complete understanding of vaginal health. Molecular approaches have already led to the identification of uncultivated bacterial taxa associated with bacterial vaginosis. Here, we review recent studies of the vaginal microbiome and discuss how culture-independent approaches, such as applications of next-generation sequencing, are advancing the field and shifting our understanding of how vaginal health is defined. This work may to lead to improved diagnostic tools and treatments for women who suffer from, or are at risk for, vaginal imbalances, pregnancy complications, and sexually acquired infections. These approaches may also transform our understanding of how host genetic factors, physiological conditions (e.g. menopause) and environmental exposures (e.g. smoking, antibiotic usage) influence the vaginal microbiome.

Fettweis, Jennifer M.; Serrano, Myrna G.; Girerd, Philippe H.; Jefferson, Kimberly K.

2012-01-01

264

Conceptual design of an advanced Stirling conversion system for terrestrial power generation  

NASA Technical Reports Server (NTRS)

A free piston Stirling engine coupled to an electric generator or alternator with a nominal kWe power output absorbing thermal energy from a nominal 100 square meter parabolic solar collector and supplying electric power to a utility grid was identified. The results of the conceptual design study of an Advanced Stirling Conversion System (ASCS) were documented. The objectives are as follows: define the ASCS configuration; provide a manufacturability and cost evaluation; predict ASCS performance over the range of solar input required to produce power; estimate system and major component weights; define engine and electrical power condidtioning control requirements; and define key technology needs not ready by the late 1980s in meeting efficiency, life, cost, and with goalds for the ASCS.

1988-01-01

265

New Generation of High Resolution Ultrasonic Imaging Technique for Advanced Material Characterization: Review  

NASA Astrophysics Data System (ADS)

The role of non-destructive material characterization and NDT is changing at a rapid rate, continuing to evolve alongside the dramatic development of novel techniques based on the principles of high-resolution imaging. The modern use of advanced optical, thermal, ultrasonic, laser-ultrasound, acoustic emission, vibration, electro-magnetic, and X-ray techniques, etc., as well as refined measurement and signal/data processing devices, allows for continuous generation of on-line information. As a result real-time process monitoring can be achieved, leading to the more effective and efficient control of numerous processes, greatly improving manufacturing as a whole. Indeed, concurrent quality inspection has become an attainable reality. With the advent of new materials for use in various structures, joints, and parts, however, innovative applications of modern NDT imaging techniques are necessary to monitor as many stages of manufacturing as possible. Simply put, intelligent advance manufacturing is impossible without actively integrating modern non-destructive evaluation into the production system.

Maev, R. Gr.

266

Third Generation Tyrosine Kinase Inhibitors and Their Development in Advanced Renal Cell Carcinoma  

PubMed Central

Angiogenesis in general and the vascular endothelial growth factor (VEGF) signaling axis in particular is a validated target in renal cell carcinoma (RCC). Clear-cell carcinoma of the kidney is now recognized as a malignancy that is sensitive to inhibitors of the VEGF pathway. Treatment options for patients with metastatic renal cell carcinoma have evolved in dramatic fashion over the past 6?years, and a new paradigm has developed. The cytokines interferon-? and interleukin-2 were previously utilized for therapy, but since December 2005, six new agents have been approved in the United States for the treatment of advanced RCC. Two are tyrosine kinase inhibitors (TKI’s) including sunitinib and recently pazopanib, and the multikinase inhibitor sorafenib. The current review examines the evolving data with the next generation of TKI’s, axitinib and tivozanib being developed for the treatment of advanced RCC. These agents were synthesized to provide increased target specificity and enhanced target inhibition. The preclinical and clinical data are examined, an overview of the development of these TKI’s is provided, and discussion plus speculation concerning their potential roles as RCC therapy is provided.

Bukowski, Ronald M.

2012-01-01

267

Three-dimensional unsteady flow calculations in an advanced gas generator turbine  

NASA Technical Reports Server (NTRS)

This paper deals with the application of a three-dimensional, unsteady Navier-Stokes code for predicting the unsteady flow in a single stage of an advanced gas generator turbine. The numerical method solves the three-dimensional thin-layer Navier-Stokes equations, using a system of overlaid grids, which allow for relative motion between the rotor and stator airfoils. Results in the form of time averaged pressures and pressure amplitudes on the airfoil surfaces will be shown. In addition, instantaneous contours of pressure, Mach number, etc. will be presented in order to provide a greater understanding of the inviscid as well as the viscous aspects of the flowfield. Also, relevant secondary flow features such as cross-plane velocity vectors and total pressure contours will be presented. Prior work in two-dimensions has indicated that for the advanced designs, the unsteady interactions can play a significant role in turbine performance. These interactions affect not only the stage efficiency but can substantially alter the time-averaged features of the flow. This work is a natural extension of the work done in two-dimensions and hopes to address some of the issues raised by the two-dimensional calculations. These calculations are being performed as an integral part of an actual design process and demonstrate the value of unsteady rotor-stator interaction calculations in the design of turbomachines.

Rangwalla, Akil A.

1993-01-01

268

Ranger© - An Affordable, Advanced, Next-Generation, Dual-Pol, X-Band Weather Radar  

NASA Astrophysics Data System (ADS)

The Enterprise Electronics Corporation (EEC) Ranger© system is a new generation, X-band (3 cm), Adaptive Polarization Doppler Weather Surveillance Radar that fills the gap between high-cost, high-power traditional radar systems and the passive ground station weather sensors. Developed in partnership with the University of Oklahoma Advanced Radar Research Center (ARRC), the system uses relatively low power solid-state transmitters and pulse compression technology to attain nearly the same performance capabilities of much more expensive traditional radar systems. The Ranger© also employs Adaptive Dual Polarization (ADP) techniques to allow Alternating or Simultaneous Dual Polarization capability with total control over the transmission polarization state using dual independent coherent transmitters. Ranger© has been designed using the very latest technology available in the industry and the technical and manufacturing experience gained through over four decades of successful radar system design and production at EEC. The entire Ranger© design concept emphasizes precision, stability, reliability, and value using proven solid state technology combined with the most advanced motion control system ever conceived for weather radar. Key applications include meteorology, hydrology, aviation, offshore oil/gas drilling, wind energy, and outdoor event situational awareness.

Stedronsky, Richard

2014-05-01

269

Supporting Development for the Stirling Radioisotope Generator and Advanced Stirling Technology Development at NASA Glenn  

NASA Technical Reports Server (NTRS)

A high-efficiency, 110-W(sub e) (watts electric) Stirling Radioisotope Generator (SRG110) for possible use on future NASA Space Science missions is being developed by the Department of Energy, Lockheed Martin, Stirling Technology Company (STC), and NASA Glenn Research Center (GRC). Potential mission use includes providing spacecraft onboard electric power for deep space missions and power for unmanned Mars rovers. GRC is conducting an in-house supporting technology project to assist in SRG110 development. One-, three-, and six-month heater head structural benchmark tests have been completed in support of a heater head life assessment. Testing is underway to evaluate the key epoxy bond of the permanent magnets to the linear alternator stator lamination stack. GRC has completed over 10,000 hours of extended duration testing of the Stirling convertors for the SRG110, and a three-year test of two Stirling convertors in a thermal vacuum environment will be starting shortly. GRC is also developing advanced technology for Stirling convertors, aimed at substantially improving the specific power and efficiency of the convertor and the overall generator. Sunpower, Inc. has begun the development of a lightweight Stirling convertor, under a NASA Research Announcement (NRA) award, that has the potential to double the system specific power to about 8 W(sub e) per kilogram. GRC has performed random vibration testing of a lowerpower version of this convertor to evaluate robustness for surviving launch vibrations. STC has also completed the initial design of a lightweight convertor. Status of the development of a multi-dimensional computational fluid dynamics code and high-temperature materials work on advanced superalloys, refractory metal alloys, and ceramics are also discussed.

Thieme, Lanny G.; Schreiber, Jeffrey G.

2005-01-01

270

Video photomicroscopy.  

PubMed

A doctor attending a teaching course on tropical medicine in Ethiopia reported severe itching at night. He noted skin lesions that appeared to be flea bites and was able to trap a flea. A video of the flea was recorded by a student with an inexpensive digital camera through the eyepiece of a microscope. PMID:25014709

Górgolas, Miguel; Cuadros, Juan

2014-07-17

271

Fast forensic video event retrieval using geospatial computing  

Microsoft Academic Search

This paper presents a fast forensic video events analysis and retrieval system in a geospatial framework. Starting from tracking targets and analyzing video streams from distributed camera networks, the system generates video tracking metadata for each video, maps and fuses them in a uniform geospatial coordinate. The combined metadata is saved into spatial database where target trajectories are represented in

Hongli Deng; Mun Wai Lee; Asaad Hakeem; Omar Javed; Weihong Yin; Li Yu; Andrew W. Scanlon; Zeeshan Rasheed; Niels Haering

2010-01-01

272

Fuzzy shot clustering to support networked video databases  

Microsoft Academic Search

Video querying involves a lot of user interaction and feedback based query refinement, which can generate large traffic volumes on the network if full video segments are sent. For efficient video browsing, search and retrieval, one need to find good compact representations for long video sequences. Representative frames (Rframes) provide such a representation. Extant algorithms use scene change detection to

Sansanee Auephaiiwiriyakul; Anupam Joshi; Raghu Krishnapuram

1998-01-01

273

Advancing real-time IR scene generation via commercial off-the-shelf components  

NASA Astrophysics Data System (ADS)

As cost becomes an increasingly important factor in the development and testing of Infrared sensors and flight computer/processors, the need for accurate hardware-in-the- loop (HWIL) simulations is critical. In the past, expensive and complex dedicated scene generation hardware was needed to attain the fidelity necessary for accurate testing. Recent technological advances and innovative applications of established technologies are beginning to allow development of cost-effective replacements for dedicated scene generators. These new scene generators are mainly constructed from commercial-off-the-shelf (COTS) hardware and software components. At the U.S. Army Aviation and Missile Command (AMCOM) Missile Research, Development, and Engineering Center (MRDEC), researchers have developed such a dynamic IR scene generator (IRSG) built around COTS hardware and software. The IRSG is used to provide dynamic inputs to an IR scene projector for in-band seeker testing and for direct signal injection into the seeker or processor electronics. AMCOM MRDEC has developed a second generation IRSG, namely IRSG2, using the latest Silicon Graphics Incorporated (SGI) Onyx2 with Infinite Reality graphics. As reported in previous papers, the SGI Onyx Reality Engine 2 is the platform of the original IRSG that is now referred to as IRSG1. IRSG1 has been in operation and used daily for the past three years on several IR projection and signal injection HWIL programs. Using this second generation IRSG, frame rates have increased from 120 Hz to 400 Hz and intensity resolution from 12 bits to 16 bits. The key features of the IRSGs are real time missile frame rates and frame sizes, dynamic missile-to-target(s) viewpoint updated each frame in real-time by a six-degree-of- freedom (6DOF) system under test (SUT) simulation, multiple dynamic objects (e.g. targets, terrain/background, countermeasures, and atmospheric effects), latency compensation, point-to-extended source anti-aliased targets, and sensor modeling effects. This paper provides a comparison between the IRSG1 and IRSG2 systems and focuses on the IRSG software, real time features, and database development tools.

Buford, James A.; King, David E.; Bowden, Mark H.

1998-07-01

274

Data Generation in the Discovery Sciences—Learning from the Practices in an Advanced Research Laboratory  

NASA Astrophysics Data System (ADS)

General scientific literacy includes understanding the grounds on which scientific claims are based. The measurements scientists make and the data that they produce from them generally constitute these grounds. However, the nature of data generation has received relatively little attention from those interested in teaching science through inquiry. To inform curriculum designers about the process of data generation and its relation to the understanding of patterns as these may arise from graphs, this 5-year ethnographic study in one advanced research laboratory was designed to investigate how natural scientists make decisions about the inclusion/exclusion of certain measurements in/from their data sources. The study shows that scientists exclude measurements from their data sources even before attempting to mathematize and interpret the data. The excluded measurements therefore never even enter the ground from and against which the scientific phenomenon emerges and therefore remain invisible to it. I conclude by encouraging science educators to squarely address this aspect of the discovery sciences in their teaching, which has both methodological and ethical implications.

Roth, Wolff-Michael

2013-08-01

275

Status of advanced fuel candidates for Sodium Fast Reactor within the Generation IV International Forum  

SciTech Connect

The main challenge for fuels for future Sodium Fast Reactor systems is the development and qualification of a nuclear fuel sub-assembly which meets the Generation IV International Forum goals. The Advanced Fuel project investigates high burn-up minor actinide bearing fuels as well as claddings and wrappers to withstand high neutron doses and temperatures. The R&D outcome of national and collaborative programs has been collected and shared between the AF project members in order to review the capability of sub-assembly material and fuel candidates, to identify the issues and select the viable options. Based on historical experience and knowledge, both oxide and metal fuels emerge as primary options to meet the performance and the reliability goals of Generation IV SFR systems. There is a significant positive experience on carbide fuels but major issues remain to be overcome: strong in-pile swelling, atmosphere required for fabrication as well as Pu and Am losses. The irradiation performance database for nitride fuels is limited with longer term R&D activities still required. The promising core material candidates are Ferritic/Martensitic (F/M) and Oxide Dispersed Strengthened (ODS) steels.

F. Delage; J. Carmack; C. B. Lee; T. Mizuno; M. Pelletier; J. Somers

2013-10-01

276

Writing for Video.  

ERIC Educational Resources Information Center

Based on the premise that writing for video is not like writing for text, this guide tells the writer how to create a video script that turns particular ideas into powerful and effective video. Defining a video script as a "blueprint for a video," the guide takes the writer step-by-step through the entire process of creating a video. Chapters in…

Bjerke, Gene

277

Foreign Affairs: Video  

NSDL National Science Digital Library

Foreign Affairs is a distinguished publication, founded in 1922 and published by the non-profit Council on Foreign Relations (CFR). Sponsoring dozens of events each year for folks with an interest in policy matters, this section of their website brings together video from these happenings, along with interviews and other audio features. The casual visitor may appreciate looking over the Most Viewed area, with offerings such as The Promise of the Arab Spring, The Coming Arctic Boom, and The Egyptian State Unravels. One popular podcast here is The World Next Week, which features conversations about those issues that will be of great import in the coming week. Visitors can look over the videos by date, regions, or topics, or perform an advanced search combining key words and filtering. Additionally, visitors can learn about the latest updates from the CFR and also take a gander at their job board.

278

Low cost scientific video movie making  

NASA Astrophysics Data System (ADS)

A low cost video movie making system is described. The system consists of a PC microcomputer based animation controller, video frame buffer, and {1}/{2?} editing video tape recorder. The graphic data typically generated on mainframe computers is transferred over a local area network to the PC, there to be recorded, one frame at a time, to produce a video tape movie. The characteristics and limitations of the system are discussed, together with implications of encoding graphic primitives in an NTSC video signal. The use of the system for scientific movie making is described.

Johnston, William E.; Hall, Dennis E.; Renema, Fritz; Robertson, David

1987-08-01

279

Fulldome Video: An Emerging Technology for Education  

ERIC Educational Resources Information Center

This article talks about fulldome video, a new technology which has been adopted fairly extensively by the larger, well-funded planetariums. Fulldome video, also called immersive projection, can help teach subjects ranging from geology to history to chemistry. The rapidly advancing progress of projection technology has provided high-resolution…

Law, Linda E.

2006-01-01

280

This Rock 'n' Roll Video Teaches Math  

ERIC Educational Resources Information Center

Mathematics is a discipline that has significantly advanced through the use of digital technologies with improved computational, graphical, and symbolic capabilities. Digital videos can be used to present challenging mathematical questions for students. Video clips offer instructional possibilities for moving students from a passive mode of…

Niess, Margaret L.; Walker, Janet M.

2009-01-01

281

Commercial Video Games in the Science Classroom  

ERIC Educational Resources Information Center

There's no denying that middle school students are interested in video games. With such motivation present, we as teachers should harness this media in a productive way in our classrooms. Students today are much more technologically advanced than ever before, and using video games is one more way to use something from their world as a teaching…

Angelone, Lauren

2010-01-01

282

Final LDRD report : advanced materials for next generation high-efficiency thermochemistry.  

SciTech Connect

Despite rapid progress, solar thermochemistry remains high risk; improvements in both active materials and reactor systems are needed. This claim is supported by studies conducted both prior to and as part of this project. Materials offer a particular large opportunity space as, until recently, very little effort apart from basic thermodynamic analysis was extended towards understanding this most fundamental component of a metal oxide thermochemical cycle. Without this knowledge, system design was hampered, but more importantly, advances in these crucial materials were rare and resulted more from intuition rather than detailed insight. As a result, only two basic families of potentially viable solid materials have been widely considered, each of which has significant challenges. Recent efforts towards applying an increased level of scientific rigor to the study of thermochemical materials have provided a much needed framework and insights toward developing the next generation of highly improved thermochemically active materials. The primary goal of this project was to apply this hard-won knowledge to rapidly advance the field of thermochemistry to produce a material within 2 years that is capable of yielding CO from CO2 at a 12.5 % reactor efficiency. Three principal approaches spanning a range of risk and potential rewards were pursued: modification of known materials, structuring known materials, and identifying/developing new materials for the application. A newly developed best-of-class material produces more fuel (9x more H2, 6x more CO) under milder conditions than the previous state of the art. Analyses of thermochemical reactor and system efficiencies and economics were performed and a new hybrid concept was reported. The larger case for solar fuels was also further refined and documented.

Ambrosini, Andrea; Miller, James Edward; Allendorf, Mark D. [Sandia National Laboratories, Livermore, CA] [Sandia National Laboratories, Livermore, CA; Coker, Eric Nicholas; Ermanoski, Ivan; Hogan, Roy E.,; McDaniel, Anthony H. [Sandia National Laboratories, Livermore, CA] [Sandia National Laboratories, Livermore, CA

2014-01-01

283

Targeted Next-generation Sequencing of Advanced Prostate Cancer Identifies Potential Therapeutic Targets and Disease Heterogeneity  

PubMed Central

Background Most personalized cancer care strategies involving DNA sequencing are highly reliant on acquiring sufficient fresh or frozen tissue. It has been challenging to comprehensively evaluate the genome of advanced prostate cancer (PCa) because of limited access to metastatic tissue. Objective To demonstrate the feasibility of a novel next-generation sequencing (NGS) based platform that can be used with archival formalin-fixed paraffin-embedded (FFPE) biopsy tissue to evaluate the spectrum of DNA alterations seen in advanced PCa. Design, setting, and participants FFPE samples (including archival prostatectomies and prostate needle biopsies) were obtained from 45 patients representing the spectrum of disease: localized PCa, metastatic hormone-naive PCa, and metastatic castration-resistant PCa (CRPC). We also assessed paired primaries and metastases to understand disease heterogeneity and disease progression. Intervention At least 50 ng of tumor DNA was extracted from FFPE samples and used for hybridization capture and NGS using the Illumina HiSeq 2000 platform. Outcome measurements and statistical analysis A total of 3320 exons of 182 cancer-associated genes and 37 introns of 14 commonly rearranged genes were evaluated for genomic alterations. Results and limitations We obtained an average sequencing depth of >900X. Overall, 44% of CRPCs harbored genomic alterations involving the androgen receptor gene (AR), including AR copy number gain (24% of CRPCs) or AR point mutation (20% of CRPCs). Other recurrent mutations included transmembrane protease, serine 2 gene (TMPRSS2):v-ets erythroblastosis virus E26 oncogene homolog (avian) gene (ERG) fusion (44%); phosphatase and tensin homolog gene (PTEN) loss (44%); tumor protein p53 gene (TP53) mutation (40%); retinoblastoma gene (RB) loss (28%); v-myc myelocytomatosis viral oncogene homolog (avian) gene (MYC) gain (12%); and phosphatidylinositol-4,5-bisphosphate 3-kinase, catalytic subunit ? gene (PIK3CA) mutation (4%). There was a high incidence of genomic alterations involving key genes important for DNA repair, including breast cancer 2, early onset gene (BRCA2) loss (12%) and ataxia telangiectasia mutated gene (ATM) mutations (8%); these alterations are potentially targetable with poly(adenosine diphosphate-ribose)polymerase inhibitors. A novel and actionable rearrangement involving the v-raf murine sarcoma viral oncogene homolog B1 gene (BRAF) was also detected. Conclusions This first-in-principle study demonstrates the feasibility of performing in-depth DNA analyses using FFPE tissue and brings new insight toward understanding the genomic landscape within advanced PCa.

Beltran, Himisha; Yelensky, Roman; Frampton, Garrett M.; Park, Kyung; Downing, Sean R.; MacDonald, Theresa Y.; Jarosz, Mirna; Lipson, Doron; Tagawa, Scott T.; Nanus, David M.; Stephens, Philip J.; Mosquera, Juan Miguel; Cronin, Maureen T.; Rubin, Mark A.

2012-01-01

284

Effective video text detection using line features  

Microsoft Academic Search

Text superimposed on video frames provides synoptic or supplemental information on video semantics. In this paper, we propose a novel method to detect superimposed text effectively. First, we detect edges by an improved Canny edge detector. Then, a line-feature vector graph is generated based on the edge map and the stroke information is extracted. Finally text regions are generated and

Yang Liu; Hong Lu; Xiangyang Xue; Yap-peng Tan

2004-01-01

285

Camera Motion Detection using Video Mosaicing  

Microsoft Academic Search

In this paper, camera motion detection methods using a background image generated by video mosaicing based on the correlation between feature points on a frame pair are described. In this method, a telop (video caption) removal method, iterative foreground and background image separation method and appropriate frame pair selection from consecutive frames are introduced to generate background images accurately. Parameters

Masaki Naito; Kazunori Matsumoto; Keiichiro Hoashi; Fumiaki Sugaya

2006-01-01

286

Video coding  

US Patent & Trademark Office Database

Digitalized video images are compressed in several steps in order to provide a system for transmitting moving video pictures via narrow band channels, such as the telephone network. The system is based on any extension of the bit-plane coding technique to video sequences and lossy conditions. The compression technique can also be advantageously used in a lossless compression system. The system involves the steps of bit plane representation and skipping the least significant bit plane(s), shifting the pixels, coding with a Gray code, the use of segmentation, and motion-estimation/motion compensation and application of a transmit/not transmit/motion compensate (TX/NT/MC) procedure, exploiting of the temporal redundancy of two corresponding bit planes via an XOR operation on two successive images, and a plane-by-plane application of an extended RLEID technique. The RLEID technique includes coding a run of like binary symbols with one word, the run including a transition between the penultimate and ultimate binary symbol.

2001-03-27

287

Development of an advanced mobile base for personal mobility and manipulation appliance generation II robotic wheelchair  

PubMed Central

Background This paper describes the development of a mobile base for the Personal Mobility and Manipulation Appliance Generation II (PerMMA Gen II robotic wheelchair), an obstacle-climbing wheelchair able to move in structured and unstructured environments, and to climb over curbs as high as 8 inches. The mechanical, electrical, and software systems of the mobile base are presented in detail, and similar devices such as the iBOT mobility system, TopChair, and 6X6 Explorer are described. Findings The mobile base of PerMMA Gen II has two operating modes: “advanced driving mode” on flat and uneven terrain, and “automatic climbing mode” during stair climbing. The different operating modes are triggered either by local and dynamic conditions or by external commands from users. A step-climbing sequence, up to 0.2 m, is under development and to be evaluated via simulation. The mathematical model of the mobile base is introduced. A feedback and a feed-forward controller have been developed to maintain the posture of the passenger when driving over uneven surfaces or slopes. The effectiveness of the controller has been evaluated by simulation using the open dynamics engine tool. Conclusion Future work for PerMMA Gen II mobile base is implementation of the simulation and control on a real system and evaluation of the system via further experimental tests.

Wang, Hongwu; Candiotti, Jorge; Shino, Motoki; Chung, Cheng-Shiu; Grindle, Garrett G.; Ding, Dan; Cooper, Rory A.

2013-01-01

288

Indianapolis I3: the third generation Integrated Advanced Information Management Systems.  

PubMed

In 2001, the Regenstrief Institute for Health Care and the Indiana University School of Medicine (IUSM) began an IAIMS planning effort to create a vision and a tactical plan for the first Integrated Advanced Information Management Systems (IAIMS) implementation to cross a large area and include unaffiliated institutions. A number of elements made this planning effort unique. Among these elements were the existence of a network infrastructure that supported the Indianapolis Network for Patient Care, the existence of a mature medical informatics program at the Regenstrief Institute, and the existence of a wide-area knowledge network fostered by the IUSM libraries. However, the leadership for a strong information technology role in the IUSM that could promote collaboration in support of education and research across the diverse Indianapolis hospital systems had been lacking. By bringing together various groups, each with a commitment to improve health care quality and public health across the Indianapolis metropolitan area, regardless of individual institutional affiliation, the strategic directions for I3-Indianapolis IAIMS Initiative have been defined and the foundations for a third generation IAIMS construct have been laid in Indianapolis, Indiana. PMID:15098046

McGowan, Julie J; Overhage, J Marc; Barnes, Mike; McDonald, Clement J

2004-04-01

289

Enzalutamide as a second generation antiandrogen for treatment of advanced prostate cancer  

PubMed Central

Prostate cancer (PCa) is the most common malignancy, and the third leading cancer-related cause of death among men of the Western world. Upon PCa progression into metastatic disease, androgen deprivation therapy is applied as the first-line treatment, and has been shown to be effective in most patients, leading to a decrease in serum prostate-specific antigen and relief of disease-related symptoms. However, advanced PCa almost inevitably progresses to a castration-resistant state, and is currently regarded as incurable. The large body of evidence indicates that PCa cells remain dependent on androgen receptor (AR) signaling even in an androgen-deprived environment. As such, development of drugs that target AR and AR signaling pathways have become one of the major milestones in treatment of castration-resistant PCa (CRPC). Nevertheless, currently available therapies that target AR signaling are still regarded as palliative and more potent therapies are in great need. Over the past few years, a wide range of novel therapies has entered clinical trial for treatment of CRPC, including androgen synthesis inhibitors (abiraterone acetate), chemotherapeutic agents (docetaxel and cabazitaxel), and immunotherapies (sipuleucel-T). In this context, enzalutamide (previously referred to as MDV3100) is a novel second generation antiandrogen that has been demonstrated to significantly improve survival in men with metastatic CRPC in several clinical trials. In this paper we summarize recently completed and ongoing clinical trials of enzalutamide, and briefly discuss the efficacy of the novel antiandrogen therapy and its limitations for treatment of CRPC.

Semenas, Julius; Dizeyi, Nishtman; Persson, Jenny Liao

2013-01-01

290

Nanoscale surface analysis on second generation advanced high strength steel after hot dip galvanizing.  

PubMed

Second generation advanced high strength steel is one promising material of choice for modern automotive structural parts because of its outstanding maximal elongation and tensile strength. Nonetheless there is still a lack of corrosion protection for this material due to the fact that cost efficient hot dip galvanizing cannot be applied. The reason for the insufficient coatability with zinc is found in the segregation of manganese to the surface during annealing and the formation of manganese oxides prior coating. This work analyses the structure and chemical composition of the surface oxides on so called nano-TWIP (twinning induced plasticity) steel on the nanoscopic scale after hot dip galvanizing in a simulator with employed analytical methods comprising scanning Auger electron spectroscopy (SAES), energy dispersive X-ray spectroscopy (EDX), and focused ion beam (FIB) for cross section preparation. By the combination of these methods, it was possible to obtain detailed chemical images serving a better understanding which processes exactly occur on the surface of this novel kind of steel and how to promote in the future for this material system galvanic protection. PMID:23404132

Arndt, M; Duchoslav, J; Preis, K; Samek, L; Stifter, D

2013-09-01

291

A VHE architecture for advanced value-added service provision in 3rd generation mobile communication networks  

Microsoft Academic Search

In the emerging era of 3rd generation mobile communication networks, it is expected that operator differentiation in the market will highly depend on the advanced provision of value-added services, including the successful implementation of the virtual home environment (VHE) concept. In this paper, after discussing some issues critical to VHE realization, we introduce a distributed application platform architecture, capable of

Nikos Houssos; Maria Koutsopoulou; Sibylle Schaller

2000-01-01

292

Monolithic solid oxide fuel cell technology advancement for coal-based power generation. Quarterly status report, July--September 1993  

SciTech Connect

Objective is to advance materials and fabrication methodologies to develop a MSOFC system capable of meeting performance, life, and cost goals for coal-based power generation. This document is divided into: introduction, background on MSOFCs (design concept and features), material development (electrolyte mechanical properties, sealant development), fabrication (anode, manifolding, stack assembly), and performance testing (single cell, stack). 17 figs.

Not Available

1993-10-01

293

Spaceborne radar interferometry techniques for the generation of deformation time series: An advanced tool for Earth's surface displacement analysis  

Microsoft Academic Search

This work is focused on advanced differential SAR interferometry (DInSAR) techniques for the generation of deformation time series from sequences of SAR images. We first present the basic rationale of these techniques providing some details of the most well known algorithms. Subsequently, through the analysis of selected case studies focused on the available C-band SAR data archives, we show the

E. Sansosti; F. Casu; M. Manzo; R. Lanari

2010-01-01

294

Advanced paternal and grandpaternal age and schizophrenia: A three-generation perspective  

PubMed Central

Background Advanced paternal age has been linked with neurodevelopmental disorders such as schizophrenia. If age-related de novo mutations in the male germ line underlie this association, it would be expected that grandpaternal as well as paternal age may influence the risk of schizophrenia. The aim of the current study was to explore the links between both paternal and grandpaternal age with respect to the risk of schizophrenia in a large, national register-based sample. Method The study was based on Swedish Multi-Generation and Hospital Discharge Registers. Parents’ ages at offspring birth were compared between 20,582 affected and 100,176 non-affected individuals. Grandparents’ ages at the birth of the parent were compared between 2,511 affected and 15,619 non-affected individuals. The risk of schizophrenia was examined when the predictor variable (parent or grandparent age) was examined in age strata with logistic regression. Planned sensitivity analyses included exploring the variables of interest in males and females separately. Results After adjusting for maternal age, birth year and sex of the proband, we confirmed that the offspring of older fathers have an increased risk of schizophrenia (e.g. compared to paternal age 20–24 years, those with fathers > 55 years had a two-fold increased risk). With respect to grandparent age, older maternal (but not paternal) grandfather age was associated with an increased risk of schizophrenia. Compared to maternal grandfather age 20–24 years, those with maternal grandfathers >55 years had a significantly increased risk of schizohrpenia (Adjusted Odds ratio and 95% Confidence intervals; 2.79, 1.71 – 4.56). The pattern of findings were essentially unchanged when we examine male and female probands separately. Conclusion This is the first the study to show an association between grandpaternal age and risk of schizophrenia. The selective effect of advanced maternal grandfather age suggests that the biological mechanisms involving the X chromosome may differentially contribute to the association between paternal age and risk of schizophrenia.

Frans, Emma M.; McGrath, John J.; Sandin, Sven; Lichtenstein, Paul; Reichenberg, Abraham; Langstrom, Niklas; Hultman, Christina M.

2013-01-01

295

A video event trigger for high frame rate, high resolution video technology  

NASA Technical Reports Server (NTRS)

When video replaces film the digitized video data accumulates very rapidly, leading to a difficult and costly data storage problem. One solution exists for cases when the video images represent continuously repetitive 'static scenes' containing negligible activity, occasionally interrupted by short events of interest. Minutes or hours of redundant video frames can be ignored, and not stored, until activity begins. A new, highly parallel digital state machine generates a digital trigger signal at the onset of a video event. High capacity random access memory storage coupled with newly available fuzzy logic devices permits the monitoring of a video image stream for long term or short term changes caused by spatial translation, dilation, appearance, disappearance, or color change in a video object. Pretrigger and post-trigger storage techniques are then adaptable for archiving the digital stream from only the significant video images.

Williams, Glenn L.

1991-01-01

296

Fragile watermarking scheme for H.264 video authentication  

NASA Astrophysics Data System (ADS)

A novel H.264 advanced video coding fragile watermarking method is proposed that enables the authenticity and integrity of the video streams to be verified. The effectiveness of the proposed scheme is demonstrated by way of experimental simulations. The results show that by embedding the watermark information in the last nonzero-quantized coefficient in each discrete cosine transform block, the proposed scheme induces no more than a minor distortion of the video content. In addition, we show that the proposed scheme is able to detect unauthorized changes in the watermarked video content without the original video. The experimental results demonstrate the feasibility of the proposed video authentication system.

Wang, Chuen-Ching; Hsu, Yu-Chang

2010-02-01

297

On Fuzzy Clustering and Content Based Access to Networked Video Databases  

Microsoft Academic Search

Video Databases and video on d emand represent an important application of the evolving Global Information Infrastructure. However, video querying involves a lot of user interaction and feedback based query refinement, which can generate large traffic volumes on the network if full video segments are sent. To aid in efficient Video browsing, search and retrieval across the network, we need

Anupam Joshi; Sansanee Auephanwiriyakul; Raghu Krishnapuram

1998-01-01

298

Concurrent CO2 Control and O2 Generation for Advanced Life Support  

NASA Technical Reports Server (NTRS)

The electrochemical reduction of carbon dioxide (CO2) using ceramic oxygen generators (COGs) is well known and widely studied, however, conventional devices using yttria-stabilized zirconia (YSZ) electrolytes operate at temperatures greater than 700 C. Operating at such high temperatures increases system mass compared to lower temperature systems because of increased energy overhead to get the COG up to operating temperature and the need for heavier insulation and/or heat exchangers to reduce the COG oxygen (O2) output temperature for comfortable inhalation. Recently, the University of Florida developed novel ceramic oxygen generators employing a bilayer electrolyte of gadolinia-doped ceria and erbia-stabilized bismuth for NASA's future exploration of Mars. To reduce landed mass and operation expenditures during the mission, in-situ resource utilization was proposed using these COGs to obtain both lifesupporting oxygen and oxidant/propellant fuel, by converting CO2 from the Mars atmosphere. The results showed that oxygen could be reliably produced from CO2 at temperatures as low as 400 C. These results indicate that this technology could be adapted to CO2 removal from a spacesuit and other applications in which CO2 removal was an issue. The strategy proposed for CO2 removal for advanced life support systems employs a catalytic layer combined with a COG so that it is reduced all the way to solid carbon and oxygen. Hence, a three-phased approach was used for the development of a viable low weight COG for CO2 removal. First, to reduce the COG operating temperature a high oxide ion conductivity electrolyte was developed. Second, to promote full CO2 reduction while avoiding the problem of carbon deposition on the COG cathode, novel cathodes and a removable catalytic carbon deposition layer were designed. Third, to improve efficiency, a pre-stage for CO2 absorption was used to concentrate CO2 from the exhalate before sending it to the COG. These subsystems were then integrated into a single CO2 removal system. This paper describes our progress to date on these tasks.

Paul, Heather L.; Duncan, Keith L.; Hagelin-Weaver, Helena E.; Bishop, Sean R.; Wachsman, Eric D.

2007-01-01

299

A Multiparent Advanced Generation Inter-Cross to fine-map quantitative traits in Arabidopsis thaliana.  

PubMed

Identifying natural allelic variation that underlies quantitative trait variation remains a fundamental problem in genetics. Most studies have employed either simple synthetic populations with restricted allelic variation or performed association mapping on a sample of naturally occurring haplotypes. Both of these approaches have some limitations, therefore alternative resources for the genetic dissection of complex traits continue to be sought. Here we describe one such alternative, the Multiparent Advanced Generation Inter-Cross (MAGIC). This approach is expected to improve the precision with which QTL can be mapped, improving the outlook for QTL cloning. Here, we present the first panel of MAGIC lines developed: a set of 527 recombinant inbred lines (RILs) descended from a heterogeneous stock of 19 intermated accessions of the plant Arabidopsis thaliana. These lines and the 19 founders were genotyped with 1,260 single nucleotide polymorphisms and phenotyped for development-related traits. Analytical methods were developed to fine-map quantitative trait loci (QTL) in the MAGIC lines by reconstructing the genome of each line as a mosaic of the founders. We show by simulation that QTL explaining 10% of the phenotypic variance will be detected in most situations with an average mapping error of about 300 kb, and that if the number of lines were doubled the mapping error would be under 200 kb. We also show how the power to detect a QTL and the mapping accuracy vary, depending on QTL location. We demonstrate the utility of this new mapping population by mapping several known QTL with high precision and by finding novel QTL for germination data and bolting time. Our results provide strong support for similar ongoing efforts to produce MAGIC lines in other organisms. PMID:19593375

Kover, Paula X; Valdar, William; Trakalo, Joseph; Scarcelli, Nora; Ehrenreich, Ian M; Purugganan, Michael D; Durrant, Caroline; Mott, Richard

2009-07-01

300

A Multiparent Advanced Generation Inter-Cross to Fine-Map Quantitative Traits in Arabidopsis thaliana  

PubMed Central

Identifying natural allelic variation that underlies quantitative trait variation remains a fundamental problem in genetics. Most studies have employed either simple synthetic populations with restricted allelic variation or performed association mapping on a sample of naturally occurring haplotypes. Both of these approaches have some limitations, therefore alternative resources for the genetic dissection of complex traits continue to be sought. Here we describe one such alternative, the Multiparent Advanced Generation Inter-Cross (MAGIC). This approach is expected to improve the precision with which QTL can be mapped, improving the outlook for QTL cloning. Here, we present the first panel of MAGIC lines developed: a set of 527 recombinant inbred lines (RILs) descended from a heterogeneous stock of 19 intermated accessions of the plant Arabidopsis thaliana. These lines and the 19 founders were genotyped with 1,260 single nucleotide polymorphisms and phenotyped for development-related traits. Analytical methods were developed to fine-map quantitative trait loci (QTL) in the MAGIC lines by reconstructing the genome of each line as a mosaic of the founders. We show by simulation that QTL explaining 10% of the phenotypic variance will be detected in most situations with an average mapping error of about 300 kb, and that if the number of lines were doubled the mapping error would be under 200 kb. We also show how the power to detect a QTL and the mapping accuracy vary, depending on QTL location. We demonstrate the utility of this new mapping population by mapping several known QTL with high precision and by finding novel QTL for germination data and bolting time. Our results provide strong support for similar ongoing efforts to produce MAGIC lines in other organisms.

Kover, Paula X.; Valdar, William; Trakalo, Joseph; Scarcelli, Nora; Ehrenreich, Ian M.; Purugganan, Michael D.; Durrant, Caroline; Mott, Richard

2009-01-01

301

Advanced, Cost-Based Indices for Forecasting the Generation of Photovoltaic Power  

NASA Astrophysics Data System (ADS)

Distribution systems are undergoing significant changes as they evolve toward the grids of the future, which are known as smart grids (SGs). The perspective of SGs is to facilitate large-scale penetration of distributed generation using renewable energy sources (RESs), encourage the efficient use of energy, reduce systems' losses, and improve the quality of power. Photovoltaic (PV) systems have become one of the most promising RESs due to the expected cost reduction and the increased efficiency of PV panels and interfacing converters. The ability to forecast power-production information accurately and reliably is of primary importance for the appropriate management of an SG and for making decisions relative to the energy market. Several forecasting methods have been proposed, and many indices have been used to quantify the accuracy of the forecasts of PV power production. Unfortunately, the indices that have been used have deficiencies and usually do not directly account for the economic consequences of forecasting errors in the framework of liberalized electricity markets. In this paper, advanced, more accurate indices are proposed that account directly for the economic consequences of forecasting errors. The proposed indices also were compared to the most frequently used indices in order to demonstrate their different, improved capability. The comparisons were based on the results obtained using a forecasting method based on an artificial neural network. This method was chosen because it was deemed to be one of the most promising methods available due to its capability for forecasting PV power. Numerical applications also are presented that considered an actual PV plant to provide evidence of the forecasting performances of all of the indices that were considered.

Bracale, Antonio; Carpinelli, Guido; Di Fazio, Annarita; Khormali, Shahab

2014-01-01

302

Advanced Thomson scattering system for high-flux linear plasma generator.  

PubMed

An advanced Thomson scattering system has been built for a linear plasma generator for plasma surface interaction studies. The Thomson scattering system is based on a Nd:YAG laser operating at the second harmonic and a detection branch featuring a high etendue (f/3) transmission grating spectrometer equipped with an intensified charged coupled device camera. The system is able to measure electron density (n(e)) and temperature (T(e)) profiles close to the output of the plasma source and, at a distance of 1.25 m, just in front of a target. The detection system enables to measure 50 spatial channels of about 2 mm each, along a laser chord of 95 mm. By summing a total of 30 laser pulses (0.6 J, 10 Hz), an observational error of 3% in n(e) and 6% in T(e) (at n(e) = 9.4 × 10(18) m(-3)) can be obtained. Single pulse Thomson scattering measurements can be performed with the same accuracy for n(e) > 2.8 × 10(20) m(-3). The minimum measurable density and temperature are n(e) < 1 × 10(17) m(-3) and T(e) < 0.07 eV, respectively. In addition, using the Rayleigh peak, superimposed on the Thomson scattered spectrum, the neutral density (n(0)) of the plasma can be measured with an accuracy of 25% (at n(0) = 1 × 10(20) m(-3)). In this report, the performance of the Thomson scattering system will be shown along with unprecedented accurate Thomson-Rayleigh scattering measurements on a low-temperature argon plasma expansion into a low-pressure background. PMID:23277985

van der Meiden, H J; Lof, A R; van den Berg, M A; Brons, S; Donné, A J H; van Eck, H J N; Koelman, P M J; Koppers, W R; Kruijt, O G; Naumenko, N N; Oyevaar, T; Prins, P R; Rapp, J; Scholten, J; Schram, D C; Smeets, P H M; van der Star, G; Tugarinov, S N; Zeijlmans van Emmichoven, P A

2012-12-01

303

Advanced Thomson scattering system for high-flux linear plasma generator  

NASA Astrophysics Data System (ADS)

An advanced Thomson scattering system has been built for a linear plasma generator for plasma surface interaction studies. The Thomson scattering system is based on a Nd:YAG laser operating at the second harmonic and a detection branch featuring a high etendue (f /3) transmission grating spectrometer equipped with an intensified charged coupled device camera. The system is able to measure electron density (ne) and temperature (Te) profiles close to the output of the plasma source and, at a distance of 1.25 m, just in front of a target. The detection system enables to measure 50 spatial channels of about 2 mm each, along a laser chord of 95 mm. By summing a total of 30 laser pulses (0.6 J, 10 Hz), an observational error of 3% in ne and 6% in Te (at ne = 9.4 × 1018 m-3) can be obtained. Single pulse Thomson scattering measurements can be performed with the same accuracy for ne > 2.8 × 1020 m-3. The minimum measurable density and temperature are ne < 1 × 1017 m-3 and Te < 0.07 eV, respectively. In addition, using the Rayleigh peak, superimposed on the Thomson scattered spectrum, the neutral density (n0) of the plasma can be measured with an accuracy of 25% (at n0 = 1 × 1020 m-3). In this report, the performance of the Thomson scattering system will be shown along with unprecedented accurate Thomson-Rayleigh scattering measurements on a low-temperature argon plasma expansion into a low-pressure background.

van der Meiden, H. J.; Lof, A. R.; van den Berg, M. A.; Brons, S.; Donné, A. J. H.; van Eck, H. J. N.; Koelman, P. M. J.; Koppers, W. R.; Kruijt, O. G.; Naumenko, N. N.; Oyevaar, T.; Prins, P. R.; Rapp, J.; Scholten, J.; Schram, D. C.; Smeets, P. H. M.; van der Star, G.; Tugarinov, S. N.; Zeijlmans van Emmichoven, P. A.

2012-12-01

304

Next-Generation Evaporative Cooling Systems for the Advanced Extravehicular Mobility Unit Portable Life Support System  

NASA Technical Reports Server (NTRS)

The development of the Advanced Extravehicular Mobility Unit (AEMU) Portable Life Support System (PLSS) is currently underway at NASA Johnson Space Center. The AEMU PLSS features two new evaporative cooling systems, the Reduced Volume Prototype Spacesuit Water Membrane Evaporator (RVP SWME), and the Auxiliary Cooling Loop (ACL). The RVP SWME is the third generation of hollow fiber SWME hardware, and like its predecessors, RVP SWME provides nominal crewmember and electronics cooling by flowing water through porous hollow fibers. Water vapor escapes through the hollow fiber pores, thereby cooling the liquid water that remains inside of the fibers. This cooled water is then recirculated to remove heat from the crewmember and PLSS electronics. Major design improvements, including a 36% reduction in volume, reduced weight, and more flight like back-pressure valve, facilitate the packaging of RVP SWME in the AEMU PLSS envelope. In addition to the RVP SWME, the Auxiliary Cooling Loop (ACL), was developed for contingency crewmember cooling. The ACL is a completely redundant, independent cooling system that consists of a small evaporative cooler--the Mini Membrane Evaporator (Mini-ME), independent pump, independent feed-water assembly and independent Liquid Cooling Garment (LCG). The Mini-ME utilizes the same hollow fiber technology featured in the RVP SWME, but is only 25% of the size of RVP SWME, providing only the necessary crewmember cooling in a contingency situation. The ACL provides a number of benefits when compared with the current EMU PLSS contingency cooling technology; contingency crewmember cooling can be provided for a longer period of time, more contingency situations can be accounted for, no reliance on a Secondary Oxygen Vessel (SOV) for contingency cooling--thereby allowing a SOV reduction in size and pressure, and the ACL can be recharged-allowing the AEMU PLSS to be reused, even after a contingency event. The development of these evaporative cooling systems will contribute to a more robust and comprehensive AEMU PLSS.

Makinen, Janice V.; Anchondo, Ian; Bue, Grant C.; Campbell, Colin; Colunga, Aaron

2012-01-01

305

Next Generation Life Support Project: Development of Advanced Technologies for Human Exploration Missions  

NASA Technical Reports Server (NTRS)

Next Generation Life Support (NGLS) is one of several technology development projects sponsored by the National Aeronautics and Space Administration s Game Changing Development Program. NGLS is developing life support technologies (including water recovery, and space suit life support technologies) needed for humans to live and work productively in space. NGLS has three project tasks: Variable Oxygen Regulator (VOR), Rapid Cycle Amine (RCA) swing bed, and Alternative Water Processing. The selected technologies within each of these areas are focused on increasing affordability, reliability, and vehicle self sufficiency while decreasing mass and enabling long duration exploration. The RCA and VOR tasks are directed at key technology needs for the Portable Life Support System (PLSS) for an Exploration Extravehicular Mobility Unit (EMU), with focus on prototyping and integrated testing. The focus of the Rapid Cycle Amine (RCA) swing-bed ventilation task is to provide integrated carbon dioxide removal and humidity control that can be regenerated in real time during an EVA. The Variable Oxygen Regulator technology will significantly increase the number of pressure settings available to the space suit. Current spacesuit pressure regulators are limited to only two settings while the adjustability of the advanced regulator will be nearly continuous. The Alternative Water Processor efforts will result in the development of a system capable of recycling wastewater from sources expected in future exploration missions, including hygiene and laundry water, based on natural biological processes and membrane-based post treatment. The technologies will support a capability-driven architecture for extending human presence beyond low Earth orbit to potential destinations such as the Moon, near Earth asteroids and Mars.

Barta, Daniel J.

2012-01-01

306

Real-time video-image analysis  

NASA Technical Reports Server (NTRS)

Digitizer and storage system allow rapid random access to video data by computer. RAPID (random-access picture digitizer) uses two commercially-available, charge-injection, solid-state TV cameras as sensors. It can continuously update its memory with each frame of video signal, or it can hold given frame in memory. In either mode, it generates composite video output signal representing digitized image in memory.

Eskenazi, R.; Rayfield, M. J.; Yakimovsky, Y.

1979-01-01

307

Accelerating YouTube with video correlation  

Microsoft Academic Search

In this paper, using long-term data traces, we present an in-depth measurement study on the characteristics of YouTube, the most successful site providing a new generation of short video sharing service. We find that YouTube videos have noticeable differences compared with traditional videos, making it difficult to use conventional strategies, such as peer-to-peer, to reduce the server workload. However, the

Xu Cheng; Jiangchuan Liu; Haiyang Wang

2009-01-01

308

Evaluating Multimedia Networking Mechanisms Using Video Traces  

Microsoft Academic Search

With the increasing popularity of networked multimedia applications, video data is expected to account for a large portion of the traffic in the Internet of the future and in next-generation wireless systems. For transport over networks, video is typically encoded (i.e., compressed) to reduce bandwidth requirements. Even compressed video, however, requires large bandwidths on the order of 100 kb\\/s or

Patrick Seeling; Martin Reisslein

2005-01-01

309

Infant CPR Video Demonstration  

MedlinePLUS

Infant CPR Video Demonstration Video demonstration of CPR instruction for infants. RETURN TO MAIN PAGE These Videos Are For Educational Use Only And Are Not Authorized for Commercial Use. © 1998 - 2011 ...

310

Marketing through Video Presentations.  

ERIC Educational Resources Information Center

Discusses the advantages of using video presentations as marketing tools. Includes information about video news releases, public service announcements, and sales/marketing presentations. Describes the three stages in creating a marketing video: preproduction planning; production; and postproduction. (JOW)

Newhart, Donna

1989-01-01

311

Advanced concurrent-engineering environment. Final report  

SciTech Connect

Sandia demonstrated large-scale visualization in a conference room environment. Project focused in the installation of hardware for visualization and display, and the integration of software tools for design and animation of 3-dimensional parts. Using a high-end visualization server, 3-dimensional modeling and animation software, and leading edge World Wide Web technology, an advanced concurrent engineering environment was simulated where a design team was able to work collectively, rather than as solely disjoint individual efforts. Finally, a successful animation of a Sandia part was demonstrated, and a computer video generated. This video is now accessible on a Sandia internal web server.

Jortner, J.N.; Friesen, J.A.

1997-07-01

312

Advanced concurrent engineering environment final report  

SciTech Connect

Sandia demonstrated large-scale visualization in a conference room environment. Project focused on the installation of hardware for visualization and display, and the integration of software tools for design and animation of 3-dimensional parts. Using a high-end visualization server, 3-dimensional modeling and animation software, and leading edge World Wide Web technology, and advanced concurrent engineering environment was simulated where a design team was able to work collectively, rather than as solely disjoint individual efforts. Finally, a successful animation of a Sandia part was demonstrated, and a computer video generated. This video is now accessible on a Sandia internal web server.

Jortner, J.N.; Friesen, J.A.; Schwegel, J.

1997-08-01

313

A prototype to automate the video subsystem routing for the video distribution subsystem of Space Station Freedom  

NASA Technical Reports Server (NTRS)

The Video Distribution Subsystem (VDS) for Space Station Freedom provides onboard video communications. The VDS includes three major functions: external video switching; internal video switching; and sync and control generation. The Video Subsystem Routing (VSR) is a part of the VDS Manager Computer Software Configuration Item (VSM/CSCI). The VSM/CSCI is the software which controls and monitors the VDS equipment. VSR activates, terminates, and modifies video services in response to Tier-1 commands to connect video sources to video destinations. VSR selects connection paths based on availability of resources and updates the video routing lookup tables. This project involves investigating the current methodology to automate the Video Subsystem Routing and developing and testing a prototype as 'proof of concept' for designers.

Betz, Jessie M. Bethly

1993-01-01

314

A prototype to automate the video subsystem routing for the video distribution subsystem of Space Station Freedom  

NASA Astrophysics Data System (ADS)

The Video Distribution Subsystem (VDS) for Space Station Freedom provides onboard video communications. The VDS includes three major functions: external video switching; internal video switching; and sync and control generation. The Video Subsystem Routing (VSR) is a part of the VDS Manager Computer Software Configuration Item (VSM/CSCI). The VSM/CSCI is the software which controls and monitors the VDS equipment. VSR activates, terminates, and modifies video services in response to Tier-1 commands to connect video sources to video destinations. VSR selects connection paths based on availability of resources and updates the video routing lookup tables. This project involves investigating the current methodology to automate the Video Subsystem Routing and developing and testing a prototype as 'proof of concept' for designers.

Betz, Jessie M. Bethly

1993-12-01

315

The development and use of radionuclide generators in nuclear medicine -- recent advances and future perspectives  

SciTech Connect

Although the trend in radionuclide generator research has declined, radionuclide generator systems continue to play an important role in nuclear medicine. Technetium-99m obtained from the molybdenum-99/technetium-99m generator system is used in over 80% of all diagnostic clinical studies and there is increasing interest and use of therapeutic radioisotopes obtained from generator systems. This paper focuses on a discussion of the major current areas of radionuclide generator research, and the expected areas of future research and applications.

Knapp, F.F. Jr.

1998-03-01

316

Science Teacher Efficacy and Extrinsic Factors toward Professional Development Using Video Games in a Design-Based Research Model: The Next Generation of STEM Learning  

ERIC Educational Resources Information Center

Designed-based research principles guided the study of 51 secondary-science teachers in the second year of a 3-year professional development project. The project entailed the creation of student-centered, inquiry-based, science, video games. A professional development model appropriate for infusing innovative technologies into standards-based…

Annetta, Leonard A.; Frazier, Wendy M.; Folta, Elizabeth; Holmes, Shawn; Lamb, Richard; Cheng, Meng-Tzu

2013-01-01

317

Final Report on Advanced Nondestructive Evaluation for Steam Generator Tubing for the Second International Steam Generator Tube Integrity Program.  

National Technical Information Service (NTIS)

This report describes research activities carried out at Argonne National Laboratory (ANL) as part of the Steam Generator Tube Integrity Program sponsored by the U.S. Nuclear Regulatory Commission. As a follow-up to preceding publications on the assessmen...

S. Bakhtiari J. Y. Park D. S. Kupperman S. Majumdar W. J. Shack

2003-01-01

318

Television camera video level control system  

NASA Technical Reports Server (NTRS)

A video level control system is provided which generates a normalized video signal for a camera processing circuit. The video level control system includes a lens iris which provides a controlled light signal to a camera tube. The camera tube converts the light signal provided by the lens iris into electrical signals. A feedback circuit in response to the electrical signals generated by the camera tube, provides feedback signals to the lens iris and the camera tube. This assures that a normalized video signal is provided in a first illumination range. An automatic gain control loop, which is also responsive to the electrical signals generated by the camera tube 4, operates in tandem with the feedback circuit. This assures that the normalized video signal is maintained in a second illumination range.

Kravitz, M.; Freedman, L. A.; Fredd, E. H.; Denef, D. E. (inventors)

1985-01-01

319

Education Tools: Nanotechnology Video Modules  

NSDL National Science Digital Library

The Penn State Center for Nanotechnology Education and Utilization (CNEU) is the home of the Pennsylvania Nanofabrication Manufacturing Technology (NMT) Partnership and the National Science Foundation (NSF) Regional Center for Nanofabrication Manufacturing Education, an NSF-sponsored regional Advanced Technology Education (ATE) Center. CNEU is dedicated to research, development, and education across all aspects of micro- and nanotechnology and the resources of the Center are focused on the incorporation of nanotechnology into secondary education, post-secondary education, and industry applications. Here, CNEU provides a series of Nanotechnology Video Modules which are used as an introduction to nanotechnology courses at CNEU partner institutions. There are currently six videos available covering introductions, nanotech basics, nanotech industry influence, nanotech educational opportunities, and career choices in nanotech. For anyone interested in basic nanotech courses or in encouraging students to consider nanotech as a career option these videos might prove useful.

2008-09-25

320

78 FR 68058 - Next Generation Risk Assessment: Incorporation of Recent Advances in Molecular, Computational...  

Federal Register 2010, 2011, 2012, 2013

...identify priority research needs. The ``Next...Advances in Molecular, Computational, and Systems Biology...incorporating molecular, computational, and systems biology...this project suggested research needs and near- and...incorporating molecular, computational, and systems...

2013-11-13

321

Next-Generation Entrepreneurs Ready to Advance Breast Cancer Research Innovations | Poster  

Cancer.gov

The trailblazing international competition focuses on bringing emerging breast cancer technologies to market through the creation of start-up businesses. The challenge was launched by The Center for Advancing Innovation (CAI), the Avon Foundation for Women, and NCI.

322

Video Rate Visual Servoing for Robots  

Microsoft Academic Search

This paper presents some recent experimental results in robotic visual servoing. A general-purpose computer in conjunction with special purpose video processing hardware, in particular a newly available hardware region-growing and moment-generation unit, has been used to visually close the robot position loop at video field rates, 60Hz.

Peter I. Corke; Richard P. Paul

1989-01-01

323

Women, Video Gaming and Learning: Beyond Stereotypes  

ERIC Educational Resources Information Center

While video gaming has grown immensely as an industry over the last decade, with growing numbers of gamers around the globe, including women, gaming continues to be a very gendered practice. The apparent gender divide in video gaming has caught the attention of both the gaming industry and educators, generating considerable discussion and…

Hayes, Elisabeth

2005-01-01

324

Promoting Academic Programs Using Online Videos  

ERIC Educational Resources Information Center

In the last 20 years, the Internet has evolved from simply conveying text and then still photographs and music to the present-day medium in which individuals are contributors and consumers of a nearly infinite number of professional and do-it-yourself videos. In this dynamic environment, new generations of Internet users are streaming video and…

Clark, Thomas; Stewart, Julie

2007-01-01

325

Second Generation Advanced Reburning for High Efficiency N0x Control  

SciTech Connect

Energy and Environmental Research Corporation is developing a family of high efficiency and low cost NO{sub x} control technologies for coal fired utility boilers based on Advanced Reburning (AR), a synergistic integration of basic reburning with injection of an N-agent. In conventional AR, injection of the reburn fuel is followed by simultaneous N-agent and overfire air injection. The second generation AR systems incorporate several components which can be used in different combinations. These components include: (1) Reburning Injection of the reburn fuel and overfire air. (2) N-agent Injection The N-agent (ammonia or urea) can be injected at different locations: into the reburning zone, along with the overfire air, and downstream of the overfire air injection. (3) N-agent Promotion Several sodium compounds can considerably enhance the NO{sub x} control from N-agent injection. These ''promoters'' can be added to aqueous N-agents. (4) Two Stages of N-agent Injection and Promotion Two N-agents with or without promoters can be injected at different locations for deeper NO{sub x} control. AR systems are intended for post-RACT applications in ozone non-attainment areas where NO{sub x} control in excess of 80% is required. AR will provide flexible installations that allow NO{sub x} levels to be lowered when regulations become more stringent. The total cost of NO{sub x} control for AR systems is approximately half of that for SCR. Experimental and kinetic modeling results for development of these novel AR systems are presented. Tests have been conducted in a 1.0 MMBtu/hr Boiler Simulator Facility with coal as the main fuel and natural gas as the reburning fuel. The results show that high efficiency NO{sub x} control, in the range 84-95%, can be achieved with various elements of AR. A comparative byproduct emission study was performed to compare the emissions from different variants of AR with commercial technologies (reburning and SNCR). For each technology sampling included: CO, SO{sub 2}, N{sub 2}O, total hydrocarbons, NH{sub 3}, HCN, SO{sub 3}, fly ash mass loading and size distribution, PM10, and carbon in ash. AR technologies do not generate significant byproduct emissions in comparison with basic reburning and SNCR processes under similar conditions. In most cases, byproduct emissions were found to be lower for the AR technologies. Kinetic modeling predictions qualitatively explain the experimental trends observed in the combustion tests. The detailed reaction mechanism can describe the interaction of NO and ammonia in the reburning and overfire air zones, the effect of mixing times, and the sodium promotion effect.

Zamansky, Vladimir M.; Maly, Peter, M.; Sheldon, Mark; Seeker, W. Randall; Folsom, Blair A.

1997-12-31

326

Numerical defect of circulating dendritic cell subsets and defective dendritic cell generation from monocytes of patients with advanced melanoma.  

PubMed

The behaviour of circulating dendritic cells (DCs) and DC generation from monocytes in melanoma patients during the progression of disease have not been described. We report a significant decrease in the absolute number of total DCs, which mainly affects plasmacytoid DCs in stage IV. Additionally, monocyte-DC generation is less efficient in advanced stages, resulting in DCs that exhibit increased phagocytic capacity, potentially indicating a less mature state. These findings elucidate aspects of basic tumour-mediated immunosuppression, which may have implications for immunotherapeutic approaches, suggesting that the selection of patients for immunotherapy should also be made on the basis of their immune status. PMID:23684927

Failli, Alessandra; Legitimo, Annalisa; Orsini, Giulia; Romanini, Antonella; Consolini, Rita

2013-09-01

327

Calendar and cycle-life studies of advanced technology development program generation 1 lithium-ion batteries  

Microsoft Academic Search

This paper presents the test results and life modeling of special calendar- and cycle-life tests conducted on 18650-size generation 1 (Gen 1) lithium-ion battery cells (nominal capacity of 0.9Ah; 3.0–4.1V rating) developed to establish a baseline chemistry and performance for the Department of Energy sponsored advanced technology development (ATD) program. Electrical performance testing was conducted at the Argonne National Laboratory

R. B Wright; C. G Motloch; J. R Belt; J. P Christophersen; C. D Ho; R. A Richardson; I Bloom; S. A Jones; V. S Battaglia; G. L Henriksen; T Unkelhaeuser; D Ingersoll; H. L Case; S. A Rogers; R. A Sutula

2002-01-01

328

Advanced building blocks of power converters for renewable energy based distributed generators  

Microsoft Academic Search

The power converter is a critical component of a distributed generation (DG) system, particularly for a renewable energy based distributed generator. With the rapid development and growing applications of DG systems, power converters have evolved from a traditional \\

Riming Shao; Mary Kaye; Liuchen Chang

2011-01-01

329

Recent Advance of Hydride Generation-Analytical Atomic Spectrometry: Part I-Technique Development  

Microsoft Academic Search

Hydride generation is the most popular and widely used chemical vapor generation, which is always interesting to analytical chemists as an effective sample introduction method, especially for elemental determination and speciation analysis by analytical atomic spectrometry. The present review provides a literature survey on the hydride generation technique coupled to analytical atomic spectrometry during the past several years, covering the

Zhou Long; Yamin Luo; Chengbin Zheng; Pengchi Deng; Xiandeng Hou

2012-01-01

330

Recent Advance of Hydride Generation–Analytical Atomic Spectrometry: Part I—Technique Development  

Microsoft Academic Search

Hydride generation is the most popular and widely used chemical vapor generation technique and is interesting to analytical chemists as an effective sample introduction method, especially for elemental determination and speciation analysis by analytical atomic spectrometry. The present review provides a literature survey on the hydride generation technique coupled to analytical atomic spectrometry during the past several years, covering the

Zhou Long; Yamin Luo; Chengbin Zheng; Pengchi Deng; Xiandeng Hou

2012-01-01

331

ADVANCED CONTROLS FOR MITIGATION OF FLICKER USING DOUBLY-FED ASYNCHRONOUS WIND TURBINE-GENERATORS  

Microsoft Academic Search

Interconnection of wind generation with power distribution systems may result in rapid voltage variations, or flicker, much more readily than for HV transmission interconnections. Wind turbine generators employing doubly- fed asynchronous generators provide a means to rapidly control reactive power, as well as to smooth variations in real power. This capability is exploited to minimize flicker, despite rapid variations of

R. A. Walling; K. Clark; N. W. Miller; J. J. Sanchez-Gasca

2005-01-01

332

Video game violence  

Microsoft Academic Search

The popularity of video games, especially violent video games, has reached phenomenal proportions. The theoretical line of reasoning that hypothesizes a causal relationship between violent video-game play and aggression draws on the very large literature on media violence effects. Additionally, there are theoretical reasons to believe that video game effects should be stronger than movie or television violence effects. This

Karen E. Dill; Jody C. Dill

1998-01-01

333

Automatic Video Classification  

Microsoft Academic Search

Within the past few years video usage has grown in a multi-fold fashion. One of the major reasons for this explosive video growth is the rising Internet bandwidth speeds. As of today, a significant human effort is needed to categorize these video data files. A successful automatic video classification method can substantially help to reduce the growing amount of cluttered

Don Jayakody

2009-01-01

334

Virage Video Engine  

Microsoft Academic Search

The temporal and multi-modal nature of video increases the dimensionality of content based retrieval problem. This places new demands on the indexing and retrieval tools required. The Virage Video Engine (VVE) with the default set of primitives provide the necessary frame work and basic tools for video content based retrieval. The video engine is a flexible platform independent architecture which

Arun Hampapur; Amarnath Gupta; Bradley Horowitz; Chiao-Fe Shu; Charles Fuller; Jeffrey R. Bach; Monika Gorkani; Ramesh Jain

1997-01-01

335

No Fuss Video  

ERIC Educational Resources Information Center

Ever since video became readily available with the advent of the VCR, educators have been clamoring for easier ways to integrate the medium into the classroom. Today, thanks to broadband access and ever-expanding offerings, engaging students with high-quality video has never been easier. Video-on-demand (VOD) services provide bite-size video clips…

Doyle, Al

2006-01-01

336

Video conferencing made easy  

NASA Technical Reports Server (NTRS)

Network video conferencing is advancing rapidly throughout the nation, and the Idaho National Engineering Laboratory (INEL), a Department of Energy (DOE) facility, is at the forefront of the development. Engineers at INEL/EG&G designed and installed a very unique DOE videoconferencing system, offering many outstanding features, that include true multipoint conferencing, user-friendly design and operation with no full-time operators required, and the potential for cost effective expansion of the system. One area where INEL/EG&G engineers made a significant contribution to video conferencing was in the development of effective, user-friendly, end station driven scheduling software. A PC at each user site is used to schedule conferences via a windows package. This software interface provides information to the users concerning conference availability, scheduling, initiation, and termination. The menus are 'mouse' controlled. Once a conference is scheduled, a workstation at the hubs monitors the network to initiate all scheduled conferences. No active operator participation is required once a user schedules a conference through the local PC; the workstation automatically initiates and terminates the conference as scheduled. As each conference is scheduled, hard copy notification is also printed at each participating site. Video conferencing is the wave of the future. The use of these user-friendly systems will save millions in lost productivity and travel cost throughout the nation. The ease of operation and conference scheduling will play a key role on the extent industry uses this new technology. The INEL/EG&G has developed a prototype scheduling system for both commercial and federal government use.

Larsen, D. Gail; Schwieder, Paul R.

1993-01-01

337

Video guidance sensor  

NASA Astrophysics Data System (ADS)

A Martin-Marietta study comparing the application of laser, video, or RF sensors was conducted in 1982. The study concluded that video was the most attractive sensor (the video also could be used for operator monitoring). The Retro-Reflector field Tracker from the Solar Array Flight Experiment was chosen as a 'first generation' sensor and integrated with guidance algorithms for evaluation on the air-bearing vehicle. Results indicated that this sensor was not applicable for the noise environment posed by the multi-layer insulation used on most spacecraft. A 'second generation' sensor was developed to be used with a modified RMS target. This sensor utilized two sets of laser diodes to acquire three optically filtered targets. The targets were illuminated first with a 780 nanometer diode, followed by illumination with a 830 nm diode. The second digitized picture was subtracted from the first to get a low-noise image. The centroids of the retroreflectors were used then to uniquely derive target attitude and range. The sensor presently operates to 80 feet and within +/- 40 degrees in pitch and yaw. Sensor operability is a concern if the sun is within a +/- 40 degree cone angle to the target. The present sensor performance characteristics are less than 1 percent range error and less than 1 degree angle error. Future sensor development is anticipated to extend the operating range to 150 feet and reduce the cone angle of sensor inoperability to within +/- 10 degrees of direct sunlight. Performance improvements also are anticipated. TRW currently is developing a system that utilizes dual cameras with simultaneous diode illumination. Although further development is being pursued, the basic system has proven sound, and the sensor is essentially ready for application.

Howard, Richard

338

MPEG-based novel look-up table for rapid generation of video holograms of fast-moving three-dimensional objects.  

PubMed

A new robust MPEG-based novel look-up table (MPEG-NLUT) is proposed for accelerated computation of video holograms of fast-moving three-dimensional (3-D) objects in space. Here, the input 3-D video frames are sequentially grouped into sets of four, in which the first and remaining three frames in each set become the reference (RF) and general frames (GFs). Then, the frame images are divided into blocks, from which motion vectors are estimated between the RF and each of the GFs, and with these estimated motion vectors, object motions in all blocks are compensated. Subsequently, only the difference images between the motion-compensated RF and each of the GFs are applied to the NLUT for CGH calculation based on its unique property of shift-invariance. Experiments with three types of test 3-D video scenarios confirm that the average number of calculated object points and the average calculation time of the proposed method, have found to be reduced down to 27.34%, 55.46%, 45.70% and 19.88%, 44.98%, 30.72%, respectively compared to those of the conventional NLUT, temporal redundancy-based NLUT (TR-NLUT) and motion compensation-based NLUT (MC-NLUT) methods. PMID:24718180

Dong, Xiao-Bin; Kim, Seung-Cheol; Kim, Eun-Soo

2014-04-01

339

Students' Use of Video Clip Technology in Clinical Education  

ERIC Educational Resources Information Center

Several analyses are conducted to prove the significance of the development in video clip technologies in the enhancement of clinical education and learning. A completely tested approach for the generation of designed video clips from video-recorded clinical sessions as used in weekly clinical forum discussions is also presented.

Baharav, Eva

2008-01-01

340

Generic Modeling and Annotation of the Dance Video Semantics  

Microsoft Academic Search

Dance is the real cultural wealth of any nation and dance media is the source for learning the dance steps by the present and future generation of students. Dance videos exhibit rich semantics and hence, the semantic modeling of the dance video objects is very crucial and complex. This paper presents a Dance Video Semantics Model (DVSM) in order to

Balakrishnan Ramadoss; Kannan Rajkumar

2006-01-01

341

Modeling, Clustering, and Segmenting Video with Mixtures of Dynamic Textures  

Microsoft Academic Search

A dynamic texture is a spatio-temporal generative model for video, which represents video sequences as observations from a linear dynamical system. This work studies the mixture of dynamic textures, a statistical model for an ensemble of video sequences that is sampled from a finite collection of visual processes, each of which is a dynamic texture. An expectation- maximization (EM) algorithm

Antoni B. Chan; Nuno Vasconcelos

2008-01-01

342

Camera View-Based American Football Video Analysis  

Microsoft Academic Search

We present a top-down statistical modeling approach to explore the semantic structure in American football video. First, a semantic space is defined where the video semantic structure is characterized by semantic units, a dynamic model over semantic units, and an observation model for mapping the semantic units with the visual features. Then, a new hidden Markov model (HMM)-based video generative

Yi Ding; Guoliang Fan

2006-01-01

343

Consumption of oxygen: a mitochondrial-generated progression signal of advanced cancer  

PubMed Central

Changes in mitochondrial genome such as mutation, deletion and depletion are common in cancer and can determine advanced phenotype of cancer; however, detailed mechanisms have not been elucidated. We observed that loss of mitochondrial genome reversibly induced overexpression and activation of proto-oncogenic Ras, especially K-Ras 4A, responsible for the activation of AKT and ERK leading to advanced phenotype of prostate and breast cancer. Ras activation was induced by the overexpression of 3-hydroxy-3-methyl-glutaryl-CoA reductase (HMGR), the rate-limiting enzyme of the mevalonate pathway. Hypoxia is known to induce proteasomal degradation of HMGR. Well differentiated prostate and breast cancer cells with high mitochondrial DNA content consumed a large amount of oxygen and induced hypoxia. Loss of mitochondrial genome reduced oxygen consumption and increased in oxygen concentration in the cells. The hypoxic-to-normoxic shift led to the overexpression of HMGR through inhibiting proteasomal degradation. Therefore, reduction of mitochondrial genome content induced overexpression of HMGR through hypoxic to normoxic shift and subsequently the endogenous induction of the mevalonate pathway activated Ras that mediates advanced phenotype. Reduction of mitochondrial genome content was associated with the aggressive phenotype of prostate cancer in vitro cell line model and tissue specimens in vivo. Our results elucidate a coherent mechanism that directly links the mitochondrial genome with the advanced progression of the disease.

Cook, C C; Kim, A; Terao, S; Gotoh, A; Higuchi, M

2012-01-01

344

Situational simulations in interactive video  

SciTech Connect

The Westinghouse Hanford Company Advanced Training Technologies section is using situational simulations in several Interactive Video training courses. Two applications of situational simulations will be discussed. In the first, used in the Hanford General Employee Training course, the student evaluates employee's actions in simulations of possible workplace situations. In the second, used in the Criticality Safety course, students must follow well-defined procedures to complete tasks. Design and incorporation of situational simulations will be discussed. 3 refs.

Smith, L.J.

1991-07-01

345

DESIGN, FABRICATION, AND TESTING OF AN ADVANCED, NON-POLLUTING TURBINE DRIVE GAS GENERATOR  

SciTech Connect

The objective of this report period was to continue the development of the Gas Generator design, fabrication and test of the non-polluting unique power turbine drive Gas Generator. Focus during this past report period has been to continue completion the Gas Generator design, completing the brazing and bonding experiments to determine the best method and materials necessary to fabricate the Gas Generator hardware, continuing to making preparations for fabricating and testing this Gas Generator and commencing with the fabrication of the Gas Generator hardware and ancillary hardware. Designs have been completed sufficiently such that Long Lead Items [LLI] have been ordered and upon arrival will be readied for the fabrication process. The keys to this design are the platelet construction of the injectors that precisely measures/meters the flow of the propellants and water all throughout the steam generating process and the CES patented gas generating cycle. The Igniter Assembly injector platelets fabrication process has been completed and bonded to the Igniter Assembly and final machined. The Igniter Assembly is in final assembly and is being readied for testing in the October 2001 time frame. Test Plan dated August 2001, was revised and finalized, replacing Test Plan dated May 2001.

Unknown

2002-01-31

346

Dispatchable Distributed Generation Network - A New Concept to Advance DG Technologies  

Microsoft Academic Search

Renewable energy has been booming globally thanks to its economic, social, and environmental benefits. However, small distributed generation (DG) systems using renewable energy have not yet achieved a significant level of penetration. With deregulation of electricity market, policies have been available to facilitate interconnection of small distributed generators (DGs) with electric grids. However, dispatchability and reliability still present technical barriers

Yaosuo Xue; Liuchen Chang; Julian Meng

2007-01-01

347

Advanced control technique application in U-tube steam generator of nuclear power station  

Microsoft Academic Search

A water level control system for a nuclear steam generator (SG) is proposed. A method to improve the performance of nuclear steam generator in nuclear power station is introduced. Combination of genetic algorithm (GA) technique and fuzzy logic control is carried out. The optimal parameters of fuzzy logic controller are achieved. These parameters include; the membership functions of water level

Hamdi M. Mousa; Sayed M. El-araby; Magdy A. Koutb; Elsayed H. M. Ali

2011-01-01

348

Synergies Between Generation-IV and Advanced Fusion Power Plant Research Programs  

Microsoft Academic Search

For the first time since the early 1990's, the U.S. Department of Energy has long term research and development programs in both nuclear fission and nuclear fusion, the Generation IV program and the ARIES program, respectively. The Generation IV program has introduced a safety goal for future fission reactor systems that has long been reflected in the ARIES mission: no

Paul P. H. Wilson; Todd R. Allen; Laila A. El-Guebaly

2005-01-01

349

DESIGN, FABRICATION, AND TESTING OF AN ADVANCED, NON-POLLUTING TURBINE DRIVE GAS GENERATOR  

SciTech Connect

The objectives of this report period were to complete the development of the Gas Generator design, which was done; fabricate and test of the non-polluting unique power turbine drive gas Gas Generator, which has been postponed. Focus during this report period has been to complete the brazing and bonding necessary to fabricate the Gas Generator hardware, continue making preparations for fabricating and testing the Gas Generator, and continuing the fabrication of the Gas Generator hardware and ancillary hardware in preparation for the test program. Fabrication is more than 95% complete and is expected to conclude in early May 2002. the test schedule was affected by relocation of the testing to another test supplier. The target test date for hot fire testing is now not earlier than June 15, 2002.

Unknown

2002-03-31

350

Domain decomposition by the advancing-partition method for parallel unstructured grid generation  

NASA Technical Reports Server (NTRS)

In a method for domain decomposition for generating unstructured grids, a surface mesh is generated for a spatial domain. A location of a partition plane dividing the domain into two sections is determined. Triangular faces on the surface mesh that intersect the partition plane are identified. A partition grid of tetrahedral cells, dividing the domain into two sub-domains, is generated using a marching process in which a front comprises only faces of new cells which intersect the partition plane. The partition grid is generated until no active faces remain on the front. Triangular faces on each side of the partition plane are collected into two separate subsets. Each subset of triangular faces is renumbered locally and a local/global mapping is created for each sub-domain. A volume grid is generated for each sub-domain. The partition grid and volume grids are then merged using the local-global mapping.

Pirzadeh, Shahyar Z. (Inventor); Banihashemi, legal representative, Soheila (Inventor)

2012-01-01

351

Single Frequency Networks for Digital Video Broadcasting  

Microsoft Academic Search

This paper introduces the Terrestrial Digital Video Broadcasting DVB-T, stating its innovative aspects and its major advantages\\u000a for data broadcasting, particularly TV broadcasting. It also presents the experimental DVB-T network built up by Retevisión\\u000a in the framework of the Spanish VIDITER project (Terrestrial Digital Video) and the European ACTS VALIDATE (Verification and\\u000a launch of Integrated Digital Advanced Television in Europe)

Jesús M. Fernández; J. Capdevila; R. García; S. Cabanillas; S. Mata; A. Mansilla; Jose M. Fernández

1999-01-01

352

High Pressure Materials Research using Advanced Third-Generation Synchrotron X-ray  

SciTech Connect

The recent discoveries of nonmolecular phases of simple molecular solids [1,2] demonstrate the proof-of-the-principles for producing exotic phases by application of high pressure. Modern advances in theoretical and computational methodologies now make possible to explain or even predict novel structures and properties in a relatively wide range of length scales on the basis of thermodynamic stability [3]. Equally important in materials research is the recent developments in advanced x-ray and laser diagnostics that enable in-situ observations at the formidable pressure-temperature conditions [4]. Having benefited by all these developments, we discuss the first principle of the pressure-induced chemistry, 'Mbar Chemistry', with a few examples that may have important implications in materials research.

Yoo, C S; Iota, V; Park, J; Lee, G; Evans, W; Jenei, Z; Cynn, H

2006-07-07

353

Design studies for an advanced ECR ion source for multiply charged ion beam generation  

SciTech Connect

An innovative technique: for increasing ion source intensity is described which, in principle, could lead to significant advances in ECR ion source technology for multiply charged ion beam formation. The advanced concept design uses a minimum-B magnetic mirror geometry which consists of a multi-cusp, magnetic field, to assist in confining the plasma radially, a flat central field for tuning to the ECR resonant condition, and specially tailored min-or fields in the end zones to confine the plasma in the axial direction. The magnetic field is designed to achieve an axially symmetric plasma ``volume`` with constant mod-B, which extends over the length of the central field region. This design, which strongly contrasts w h the ECR ``surfaces`` characteristic of conventional ECR ion sources, results in dramatic increases in the absorption of RF power, thereby increasing the electron temperature and ``hot`` electron population within the ionization volume of the source.

Alton, G.D.

1994-10-01

354

Advanced Corrosion-Resistant Zr Alloys for High Burnup and Generation IV Applications  

SciTech Connect

The objective of this collaboration between four institutions in the US and Korea is to demonstrate a technical basis for the improvement of the corrosion resistance of zirconium-based alloys in more extreme operating environments (such as those present in severe fuel duty,cycles (high burnup, boiling, aggressive chemistry) andto investigate the feasibility (from the point of view of corrosion rate) of using advanced zirconium-based alloys in a supercritical water environment.

Arthur Motta; Yong Hwan Jeong; R.J. Comstock; G.S. Was; Y.S. Kim

2006-10-31

355

High Pressure Materials Research using Advanced Third-Generation Synchrotron X-ray  

Microsoft Academic Search

The recent discoveries of nonmolecular phases of simple molecular solids [1,2] demonstrate the proof-of-the-principles for producing exotic phases by application of high pressure. Modern advances in theoretical and computational methodologies now make possible to explain or even predict novel structures and properties in a relatively wide range of length scales on the basis of thermodynamic stability [3]. Equally important in

C S Yoo; V Iota; G Lee; W Evans; Z Jenei; H Cynn

2006-01-01

356

Multiscale Modeling of the Deformation of Advanced Ferritic Steels for Generation IV Nuclear Energy  

SciTech Connect

The objective of this project is to use the multi-scale modeling of materials (MMM) approach to develop an improved understanding of the effects of neutron irradiation on the mechanical properties of high-temperature structural materials that are being developed or proposed for Gen IV applications. In particular, the research focuses on advanced ferritic/ martensitic steels to enable operation up to 650-700°C, compared to the current 550°C limit on high-temperature steels.

Nasr M. Ghoniem; Nick Kioussis

2009-04-18

357

Content adaptive enhancement of video images  

NASA Astrophysics Data System (ADS)

Digital video products such as TVs, set-up boxes and DV players have circuits that enhance quality of incoming video content. User may control parameters of these circuits according to video source for optimum quality. However, there is a need for a procedure that can adjust these parameters automatically without user interaction. A three stages method for content adaptive enhancement of video images (CAEVI) in display processors is proposed. The first stage measures video signal statistics such as intensity and frequency histograms over image's active area. The following stage generates control parameters for image processing blocks after measured statistics analysis. One of four quality classes (low, medium, high or special) is assigned to the incoming video, and a set of predefined control parameters for this class is selected. At the third stage, the set of control parameters is applied to the corresponding image processing blocks to reduce noise, improve signal transitions, enhance spatial details, contrast, brightness and saturation, and resample the video image. Video signal statistics are measured and accumulated for each frame, and control parameters are gradually adjusted on scene basis. Measuring and processing blocks are implemented in hardware to provide real time response. Image analysis and quality classification algorithm is implemented in embedded software for flexibility. The proposed method has been implemented in video processor as "Auto HQV" feature. The method was originally developed for TVs and. It is currently under adaptation for hand held devices.

Lachine, Vladimir; Lee, Louie; Smith, Gregory

2012-10-01

358

DESIGN, FABRICATION, AND TESTING OF AN ADVANCED, NON-POLLUTING TURBINE DRIVE GAS GENERATOR  

SciTech Connect

The objective of this report period was to continue the development of the Gas Generator design, completion of the hardware and ancillary hardware fabrication and commence the Test Preparations for the testing of the non-polluting unique power turbine driven Gas Generator. Focus during this report period has been on completing the Gas Generator fabrication of hardware and ancillary hardware, and completion of unit closeout brazing and bonding. Because of unacceptable delays encountered in a previously competitively selected test site, CES initiated a re-competition of our testing program and selected an alternate test site. Following that selection, CES used all available resources to make preparations for testing the 10 Mw Gas Generator at the new testing site facilities of NTS at Saugus, CA.

E.W. (Gene) Baxter

2002-06-30

359

Monolithic solid oxide fuel cell technology advancement for coal-based power generation. Annual report, October 1991--September 1992  

SciTech Connect

The program is being conducted by a team consisting of AlliedSignal Aerospace Systems & Equipment (ASE) (formerly AiResearch Los Angeles Division) and Argonne National Laboratory (ANL). The objective of the program is to advance materials and fabrication methodologies to develop a monolithic solid oxide fuel cell (MSOFC) system capable of meeting performance, life, and cost goals for coal-based power generation. The program focuses on materials research and development, fabrication process development, cell/stack performance testing and characterization, cost and system analysis, and quality development.

Not Available

1993-05-01

360

Person-based video summarization and retrieval by tracking and clustering temporal face sequences  

NASA Astrophysics Data System (ADS)

People are often the most important subjects in videos. It is highly desired to automatically summarize the occurrences of different people in a large collection of video and quickly find the video clips containing a particular person among them. In this paper, we present a person-based video summarization and retrieval system named VideoWho which extracts temporal face sequences in videos and groups them into clusters, with each cluster containing video clips of the same person. This is accomplished based on advanced face detection and tracking algorithms, together with a semisupervised face clustering approach. The system achieved good clustering accuracy when tested on a hybrid video set including home video, TV plays and movies. On top of this technology, a number of applications can be built, such as automatic summarization of major characters in videos, person-related video search on the Internet and personalized UI systems etc.

Zhang, Tong; Wen, Di; Ding, Xiaoqing

2013-03-01

361

A next-generation in-situ nanoprobe beamline for the Advanced Photon Source  

NASA Astrophysics Data System (ADS)

The Advanced Photon Source is currently developing a suite of new hard x-ray beamlines, aimed primarily at the study of materials and devices under real conditions. One of the flagship beamlines of the APS Upgrade is the In-Situ Nanoprobe beamline (ISN beamline), which will provide in-situ and operando characterization of advanced energy materials and devices under change of temperature and gases, under applied fields, in 3D. The ISN beamline is designed to deliver spatially coherent x-rays with photon energies between 4 keV and 30 keV to the ISN instrument. As an x-ray source, a revolver-type undulator with two interchangeable magnetic structures, optimized to provide high brilliance throughout the range of photon energies of 4 keV - 30 keV, will be used. The ISN instrument will provide a smallest hard x-ray spot of 20 nm using diffractive optics, with sensitivity to sub-10 nm sample structures using coherent diffraction. Using nanofocusing mirrors in Kirkpatrick-Baez geometry, the ISN will also provide a focus of 50 nm with a flux of 8·1011 Photons/s at a photon energy of 10 keV, several orders of magnitude larger than what is currently available. This will allow imaging of trace amounts of most elements in the periodic table, with a sensitivity to well below 100 atoms for most metals in thin samples. It will also enable nanospectroscopic studies of the chemical state of most materials relevant to energy science. The ISN beamline will be primarily used to study inorganic and organic photovoltaic systems, advanced batteries and fuel cells, nanoelectronics devices, and materials and systems diesigned to reduce the environmental impact of combustion.

Maser, Jörg; Lai, Barry; Buonassisi, Tonio; Cai, Zhonghou; Chen, Si; Finney, Lydia; Gleber, Sophie-Charlotte; Harder, Ross; Jacobsen, Chris; Liu, Wenjun; Murray, Conal; Preissner, Curt; Roehrig, Chris; Rose, Volker; Shu, Deming; Vine, David; Vogt, Stefan

2013-09-01

362

A video pre\\/post-processing LSI for video capture  

Microsoft Academic Search

A video processing LSI which converts video signals to digital YUV signals in various image formats was successfully developed for a video capture system. This LSI is suitable for PC cameras, camera\\/recorders and PC video capture boards

T. Kinugasa; A. Nishizawa; K. Koshio; T. Iguchi; J. Kamimura; H. Marumori

1996-01-01

363

Next-Generation Cancer Vaccine Approaches: Integrating Lessons Learned From Current Successes With Promising Biotechnologic Advances  

PubMed Central

With the recent approval of sipuleucel-T for metastatic castration-resistant prostate cancer and ipilimumab for metastatic melanoma, there is increasing excitement in the field of cancer immunotherapy. A large number of clinical trials are currently testing various vaccine vectors in a diverse array of cancer types. Which of these strategies will ultimately prove successful has yet to be determined. However, a better understanding of the complex interplay of tumor-specific T cells and the challenges faced at the tumor microenvironment, advances in biotechnology, and lessons learned from prior successes and failures will likely lead to approvals of other therapeutic cancer vaccines.

Le, Dung T.; Jaffee, Elizabeth M.

2014-01-01

364

Advancements in adaptive optics technology: micro deformable mirrors and laser guidestars for the next generation of extremely large telescopes  

NASA Astrophysics Data System (ADS)

Micro-electro mechanical devices (MEMS) deformable mirrors offer a compact and affordable path to complex next generation AO instruments on large telescopes. In this talk we discuss our plans and experimental progress on MEMS-based AO systems: the high-contrast Gemini Planet Imager, the ShaneAO laser guidestar system, and the proposed Keck Next Generation AO system. Each of these instruments employs unique advantages of micro-mirrors including a large actuator count in a small space and go-to open-loop controllability. Large aperture telescopes present a challenging wide-field optical design problem however, a topic we will address with proposed MEMS solutions. We also discuss the advances in laser guidestar technology for AO, highlighting the need for brighter guidestars as we increase the sampling density for higher Strehl systems. We discuss our modeling of the sodium laser interaction and exploration of pulse and spectral format for maximum return from the sodium layer.

Gavel, Donald; Kupke, Renate; Thomas, Sandrine; Morzinski, Katie; Norton, Andrew; Rampy, Rachel

2011-09-01

365

Video Google: Efficient Visual Search of Videos  

Microsoft Academic Search

We describe an approach to object retrieval which searches for and localizes all the occurrences of an object in a video, given a query image of the object. The object is represented by a set of viewpoint invariant region descriptors so that recognition can proceed successfully despite changes in viewpoint, illumination and partial occlusion. The temporal continuity of the video

Josef Sivic; Andrew Zisserman

2006-01-01

366

Recent Advance of Hydride Generation–Analytical Atomic Spectrometry: Part II—Analysis of Real Samples  

Microsoft Academic Search

Abstract: As an extended discussion of Part I, this review provides a survey of the literature about the elemental and speciation analysis of hydride-forming and non-hydride-forming elements in real samples by using hydride generation–analytical atomic spectrometry based on the recently developed technique summarized in Part I, with emphasis on the sample pretreatment methods and interference elimination.

Zhou Long; Chen Chen; Xiandeng Hou; Chengbin Zheng

2012-01-01

367

Advanced solid reactants for H/sub 2//D/sub 2/ generation  

SciTech Connect

Disclosed is an all amine borane gas generating system which consists of hydrazine bis-borane or its deuterated derivative in the form of a compacted solid propellant pellet which serves as the thermal stimulus for the decomposition of itself. An all amine borane gas generating system which additionally consists of diborane diammoniate or its deuterated derivative provides a higher yield of hydrogen or deuterium with a higher purity from a self-sustaining reaction after the self-sustaining reaction is initiated by a heat source (e.g., an electrically heated nichrome wire) sufficient to initiate the reaction. This all amine borane gas generating system which consists of N/sub 2/H/sub 4/./sub 2/BH/sub 3/ and H/sub 2/B(NH/sub 3/)/sub 2/BH/sub 4/ is in the form of a compacted solid propellant pellet. The pellets are formed to the desired configuration employing pressures from about 500 to about 10,000 pounds total load. The solid propellant pellets are useful as a H/sub 2/ or D/sub 2/ generation sources for fuels for lasers.

Flanagan, J.E.; Grant, L.R.

1983-04-26

368

Operational Behavior of Emergency Generators in Italy: Management Problems. Research Advancements.  

National Technical Information Service (NTIS)

Some of the results of the research on 113 emergency diesel generator units which are in operation in Italy are reported. Attention is focused on maintenance, operation, management problems as they appear in the industrial structure and services in this c...

S. Pia

1982-01-01

369

Next Generation of Risk Assessment: Incorporation of Recent Advances in Molecular, Computational and Systems Biology  

EPA Science Inventory

The Next Generation (NexGen) Risk Assessment program was initiated in 2010 as a multi-year, multi-organization effort to consider new molecular, computational, and systems biology approaches for use in risk assessments. The goal is to enable faster, less expensive, and more robus...

370

A rule-based expert system for generating control displays at the Advanced Photon Source  

Microsoft Academic Search

The integration of a rule-based expert system for generating screen displays for controlling and monitoring instrumentation under the Experimental Physics and Industrial Control System (EPICS) is presented. The expert system is implemented using CLIPS, an expert system shell from the Software Technology Branch at Lyndon B. Johnson Space Center. The user selects the hardware input and output to be displayed

Karen J. Coulter

1994-01-01

371

A rule-based expert system for generating control displays at the Advanced Photon Source  

Microsoft Academic Search

The integration of a rule-based expert system for generating screen displays for controlling and monitoring instrumentation under the Experimental Physics and Industrial Control System (EPICS) is presented. The expert system is implemented using CLIPS, an expert system shell from the Software Technology Branch at Lyndon B. Johnson Space Center. The user selects the hardware input and output to be displayed

Coulter

1993-01-01

372

Advances Towards Automatic Surface Domain Decomposition and Grid Generation for Overset Grids.  

National Technical Information Service (NTIS)

An algorithm for surface domain decomposition and grid generation for overset grids is described. A complex surface domain is covered by two types of grids: seam grids and block grids. Seam grids are grids used to wrap around surface crease lines and regi...

R. L. Meakin W. M. Chan

1997-01-01

373

Recent advances in variable speed electrical generator systems for large wind turbines  

SciTech Connect

Major variable speed electrical generator system design objectives have been verified through large-scale experiment. Full exploitation of variable speed generator benefits can revolutionize large wind turbine design. The greatest advantages come not only from the improved aerodynamic efficiency of keeping tip speed proportional to wind speed, but from dramatic reduction in drive train resonances, elimination of dissipative damping losses, easy motorized turbine start, and isolation of turbine dynamics from the electrical network. Experimental verification proceeded by two steps: first, actual control hardware and software were verified with a hybrid simulation of a full wind turbine system; then the controls were combined with power thyristor bridges configured as a cycloconverter and motor-generator test train to implement a variable speed generator and a simulated wind-turbine/drive train. Although the existing equipment presented several constraints on testing latitude, major features demonstrated include: (1) variable frequency motoring to 50% speed for quick, efficient turbine start-up; (2) synchronization below, at, and above synchronous speeds, both steady state and transient; (3) net power output up to 120 kW with stable response to 50 kW step changes in demand within one second and similarly responsive control of VARs; (4) steady power and VAR output throughout speed transients from ten percent below to ten percent above synchronous speed; (5) output voltage waveform with less than five percent total harmonic distortion; and (6) damping of simulated drive train resonance at 0.2 Hz.

Andersen, T.S.; Hughes, P.S.; Klein, F.F.; Mutone, G.A.

1983-01-01

374

Video coding with dynamic background  

NASA Astrophysics Data System (ADS)

Motion estimation (ME) and motion compensation (MC) using variable block size, sub-pixel search, and multiple reference frames (MRFs) are the major reasons for improved coding performance of the H.264 video coding standard over other contemporary coding standards. The concept of MRFs is suitable for repetitive motion, uncovered background, non-integer pixel displacement, lighting change, etc. The requirement of index codes of the reference frames, computational time in ME & MC, and memory buffer for coded frames limits the number of reference frames used in practical applications. In typical video sequences, the previous frame is used as a reference frame with 68-92% of cases. In this article, we propose a new video coding method using a reference frame [i.e., the most common frame in scene (McFIS)] generated by dynamic background modeling. McFIS is more effective in terms of rate-distortion and computational time performance compared to the MRFs techniques. It has also inherent capability of scene change detection (SCD) for adaptive group of picture (GOP) size determination. As a result, we integrate SCD (for GOP determination) with reference frame generation. The experimental results show that the proposed coding scheme outperforms the H.264 video coding with five reference frames and the two relevant state-of-the-art algorithms by 0.5-2.0 dB with less computational time.

Paul, Manoranjan; Lin, Weisi; Lau, Chiew Tong; Lee, Bu-Sung

2013-12-01

375

Behavior of vortices generated by an advancing ejecta curtain in theory, in the laboratory, and on Mars  

NASA Technical Reports Server (NTRS)

Several papers assess the interaction between an atmosphere and advancing ejecta to assess possible atmospheric processes affecting ejecta emplacement. Ejecta travel through an atmosphere in two modes: larger ejecta blocks follow ballistic trajectories unhindered by the atmosphere; finer ejecta are entrained in a turbulent basal cloud, which develops as the advancing ejecta curtain generates strong atmospheric winds. Laboratory experiments reveal that this cloud of fine ejecta produce ramparts, flow lobes, or radial scouring that superposes larger ballistic ejecta emplaced earlier. Martian, Venusian, and terrestrial ejecta facies can be interpreted in terms of processes observed in the laboratory with appropriate first-order corrections for scaling. A continuum model of the atmospheric flow around an advancing inclined plate simulated and reproduced some of the complex flow patterns observed in front and at the top of the curtain. Here we consider improvements to the model to compare quantitatively the approximate position of ejecta deposition (i.e., run-out distance) with laboratory experiments and Martian ejecta facies.

Barnouin, O. S.; Schultz, P. H.

1993-01-01

376

Fossil Halls: Curator Videos  

NSDL National Science Digital Library

Part of a larger virtual tour of the Museum's famed Fossil Halls, this Web site has links to a library of 22 videos highlighting specific exhibits in the hall. The videos are available in broadband and dial-up versions.

377

Video Relay Services  

MedlinePLUS

... users through video equipment, rather than through typed text. Video equipment links the VRS user with a ... CA flows much more quickly than with a text-based TRS call, VRS has become an enormously ...

378

An advanced methodology for generating multigroup cross sections for shielding calculations  

NASA Astrophysics Data System (ADS)

Deterministic methods (e.g., the discrete ordinates (SN) method) are commonly used in solving shielding problems. The SN method solves the linear Boltzmann equation by discretizing spatial, angular and energy dependencies. One of the major uncertainties in SN transport calculations is caused by the energy discretization. Energy discretization requires the use of multigroup cross sections. Therefore, to obtain better accuracy in results, it is of best interest to use effective multigroup cross sections. Currently there are several publicly available multigroup cross section libraries that were generated for particular applications, for example, for shielding or core calculations. However, there is no publicly available, problem-dependent methodology for construction of effective multigroup libraries. In order to enhance the accuracy in shielding calculations, we developed a new, iterative methodology, referred to as the CPXSD (C&barbelow;ontributon and P&barbelow;oint-Wise C&barbelow;ross-S&barbelow;ection ?riven), that constructs group structures for an objective of interest. Additionally, to improve the computational efficiency in generating multigroup libraries, we developed a parallel version of the cross-section processing code NJOY. Besides increasing the accuracy and efficiency of multigroup libraries, we analyzed the 47-neutron, 20-gamma group BUGLE libraries that were generated at the Oak Ridge National Laboratory (ORNL) with the standard multigroup procedure, successfully benchmarked our BUGLE-like libraries against the ORNL BUGLE libraries, and performed modifications to the standard BUGLE libraries. Further work was pursued in comparing multigroup libraries with continuous energy libraries. In this thesis, we demonstrated that the parallel version of NJOY that we developed introduces speedups of ˜5 in generating a BUGLE-like library consisting of 27 nuclides. We showed that using an effective fine-group structure in generating broad group libraries, and the bi-linear adjoint weighting technique are two important factors that increase the accuracy of broad-group libraries. Furthermore, we illustrated the value of the CPXSD methodology by generating fine- and broad-group libraries for shielding problems. We demonstrated that CPXSD yields effective libraries which include significantly fewer groups, while resulting in more accurate results. For example, for fast neutron dosimetry, the CPXSD generated broad-group libraries have almost half the number of groups of the BUGLE groups above 0.1 MeV, and resulted in improved accuracy (e.g. ˜4%).

Alpan, Fatos Arzu

379

VideoSense: towards effective online video advertising  

Microsoft Academic Search

With Internet delivery of video content surging to an un- precedented level, online video advertising is becoming in- creasingly pervasive. In this paper, we present a novel ad- vertising system for online video service called VideoSense, which automatically associates the most relevant video ads with online videos and seamlessly inserts the ads at the most appropriate positions within each individual

Tao Mei; Xian-sheng Hua; Linjun Yang; Shipeng Li

2007-01-01

380

Quality-Aware Video  

Microsoft Academic Search

Recent development in network visual communications has empha- sized on the need of objective, reliable and easy-to-use video quality assessment (VQA) systems. This paper introduces a novel idea of quality-aware video (QAV), in which extracted features about the original video sequence are invisibly embedded into the same video data. When such a QAV sequence is distributed over an error-prone network,

Basavaraj Hiremath; Qiang Li; Zhou Wang

2007-01-01

381

Informedia Digital Video Library  

Microsoft Academic Search

The Informedia Digital Video Library Project is developing new technologies for creating full-content search and retrieval digital video libraries. Working in collaboration with WQED Pittsburgh, the project is creating a testbed that will enable K-12 students to access, explore, and retrieve science and mathematics materials from the digital video library. The library will initially contain 1,000 hours of video from

Michael G. Christel; Takeo Kanade; M. Mauldin; Raj Reddy; Marvin A. Sirbu; Scott M. Stevens; Howard D. Wactlar

1995-01-01

382

Video Game Designer  

NSDL National Science Digital Library

Do you like to play video games? Did you know that in your future career you could design video games for youth just like you? Read the information on this site to learn what a video designer does and what classes you need to take in order to become one. You can also read about some famous current video game designers and about the games they have designed.

2005-12-05

383

Measurements of nonlinear harmonic generation at the Advanced Photon Source's SASE FEL  

SciTech Connect

SASE saturation was recently achieved at the Advanced Photon Source's SASE FEL in the low-energy undulator test line (LEUTL) at 530 nm and 385 nm. The electron beam microbunching becomes more and more prominent until saturation is achieved. This bunching causes nonlinear harmonic emission that extends the usefulness of a SASE system in achieving shorter FEL wavelengths for the same electron beam energy. They have investigated the intensity of the fundamental and second-harmonic undulator radiation as a function of distance along the undulator line and present the experimental results and compare them to numerical simulations. In addition, they have measured the single-shot second harmonic spectra as well as the simultaneous fundamental and second harmonic spectra and present the experimental results.

Biedron, S.G.; Dejus, E.J.; Huang, Z.; Milton, S.V.; Sajaev, V.; Berg, W.; Borland, M.; Den Hartog, P.K.; Erdmann, M.; Fawley, W.M.; Gluskin, E.; Kim, K.-J.; Lewellen, J.W.; Li, Y.; Moog, E.R.; Nassiri, A.; Wiermerslage, G.; Yang, B.X.

2002-03-01

384

Advanced controls for stability assessment of solar dynamics space power generation  

NASA Technical Reports Server (NTRS)

In support of the power requirements for the Space Station Alpha (SSA), a joint program by the U.S. and Russia for a permanently manned space station to be launched into orbit by 1998, a robust control scheme is needed to assure the stability of the rotating machines that will be integrated into the power subsystem. A framework design and systems studies for modeling and analysis is presented. It employs classical d-q axes machine model with voltage/frequency dependent loads. To guarantee that design requirements and necessary trade studies are done, a functional analysis tool CORE is used for the study. This provides us with different control options for stability assessment. Initial studies and recommendations using advanced simulation tools are also presented. The benefits of the stability/control scheme for evaluating future designs and power management are discussed.

Momoh, James A.; Anwah, Nnamdi A.

1995-01-01

385

Video Stabilization and Enhancement  

Microsoft Academic Search

We describe a simple and computationally efficient approach for video stabilization and enhancement. By combining multiple low-quality video frames, it is possible to extract a high-quality still image. This technique is particularly helpful in identifying people, license plates, etc. from low-quality video surveillance cameras.

Hany Farid; Jeffrey B. Woodward

2007-01-01

386

Video Gallery: Shark Dissection  

NSDL National Science Digital Library

This video gallery is from the Museum's Seminars on Science, a series of distance-learning courses designed to help educators meet the new national science standards. There are 16 videos each covering dissection of a different part of the dogfish shark. There is a downloadable pdf for each video.

387

Video Demonstration: Borescope Inspection  

NSDL National Science Digital Library

This module, produced by the Wind Technician TV project from Highland Community College, provides a video demonstration of the Everest XLG3 video probe used to inspect a wind turbine gearbox. This would be useful for students who are learning the visual inspection process and want to see how this specific technology works. Running time for the video is 2:59.

2012-10-24

388

Guitarbuilding Fabrication Video Series  

NSDL National Science Digital Library

This page from the Guitarbuilding project provides a number of very interesting videos on the design and manufacturing of guitars. Videos cover topics like performing basic wood repairs on guitars, soldering and wiring techniques, gluing fretboards to guitar necks and assembling the pickups to the pickup rings. The videos vary in length, and Flash is required to view them.

2011-11-18

389

AdBlockVideo  

NSDL National Science Digital Library

Video ads can be quite a nuisance. AdBlockVideo can help users out by effectively blocking such ads. Visitors will need to download the program and they can toggle AdBlockVideo on and off as they see fit. This application is compatible with computers running Windows 98 and newer, Max OS 10.3 and newer, and Linux.

2011-01-01

390

Raptor network video coding  

Microsoft Academic Search

In this paper, we consider the problem of streaming video information on lossy packet networks with path and source diversity, such as wireless mesh networks or more generally overlay architectures. We propose to distribute the video information between several streaming servers and to implement network coding in the forwarding peers in order to increase the quality of the video decoded

Nikolaos Thomos; Pascal Frossard

2007-01-01

391

Networking digital video  

Microsoft Academic Search

Fluent Machines Inc., has developed Fluency, a system architecture for digital video consisting of FluentStreams system software, FluentLinks network software and the VSA-1000 digital video system hardware. The author presents the technical challenges inherent in networking digital video, and describes how Fluent's system architecture is designed to meet these requirements

P. Uppaluru

1992-01-01

392

Advanced singlet oxygen generator and nozzle bank in traditional COIL technology  

NASA Astrophysics Data System (ADS)

A centrifugal bubbling SOG generated gas flow with partial oxygen pressure up to 40 torr at singlet oxygen yield about 60% and residual chlorine less than 10%. At initial BHP temperature 260K and ratio of chlorine molar flow rate to BHP volumetric rate of 1mole/litre the output BHP temperature was 290K and water vapor fraction relative to the oxygen was 15%. An oxygen flux up to 6 mmole/s per 1 cm2 of the bubbler surface has been attained. An ejector nozzle bank generates gain medium flow at Mach number ~2 and temperature lower 200K with small signal gain higher 1%/cm. Ejector COIL powered by centrifugal bubbling SOG demonstrated ~25% of chemical efficiency with specific power 6 kW per 1 litre/s of BHP volumetric rate.

Zagidullin, Marsel V.; Nikolaev, Valery D.; Khvatov, Nikolay A.; Svistun, Michael I.

2007-08-01

393

Research into advanced concepts of microwave power amplification and generation utilizing linear beam devices  

NASA Technical Reports Server (NTRS)

A theoretical study of some aspects of the interaction between a drifting stream of electrons with transverse cyclotron motions and an electromagnetic field is presented. Particular emphasis was given to the possible generation and amplification of millimeter waves. The major effort was devoted to a theoretical study of the cyclotron resonance oscillator. The appendices include published papers on the cyclotron resonance oscillator which resulted from this investigation.

Mcisaac, P. R.

1972-01-01

394

Advanced high-explosive flux compression generator development: The CN-III series  

Microsoft Academic Search

A very successful series of three flux compression generator (FCG) experiments and one hydro-only test, designed to quantify the performance capabilities and limitations of high-current, high-field, high-power coaxial FCGs, is reported. In the last test, the CN-III FCG produced a peak current of >150 MA with a final doubling time of <10μs into a 2-nH inductive load. Experimental results are

B. L. Freeman; M. G. Sheppard; C. M. Fowler

1992-01-01

395

Advanced high-explosive flux compression generator development: The CN3 series  

Microsoft Academic Search

A very successful series of three flux compression generator (FCG) experiments and one hydro-only test, designed to quantify the performance capabilities and limitations of high-current, high-field, high-power coaxial FCG's, is reported. In the last test, the CN-3 FCG produced a peak current of greater than 150 MA with a final doubling time of less than 10 micro-s into a 2-nH

B. L. Freeman; M. G. Sheppard; C. M. Fowler

1992-01-01

396

Using High-Level Semantic Features in Video Retrieval  

Microsoft Academic Search

Extraction and utilization of high-level semantic features are critical for more effective video retrieval. However, the performance of video retrieval hasn't benefited much despite of the advances in high-level feature extraction. To make good use of high-level semantic features in video retrieval, we present a method called pointwise mutual informa- tion weighted scheme(PMIWS). The method makes a good judgment of

Wujie Zheng; Jianmin Li; Zhangzhang Si; Fuzong Lin; Bo Zhang

2006-01-01

397

Science Sampler: Commercial video games in the science classroom  

NSDL National Science Digital Library

Thereâs no denying that middle school students are interested in video games. With such motivation present, we as teachers should harness this media in a productive way in our classrooms. Students today are much more technologically advanced than ever before, and using video games is one more way to use something from their world as a teaching tool. This article presents a list of potential video games for use in the middle school science classroom... [view full summary

Angelone, Lauren

2010-02-01

398

A Novel Key-Frame Extraction Approach for Both Video Summary and Video Index  

PubMed Central

Existing key-frame extraction methods are basically video summary oriented; yet the index task of key-frames is ignored. This paper presents a novel key-frame extraction approach which can be available for both video summary and video index. First a dynamic distance separability algorithm is advanced to divide a shot into subshots based on semantic structure, and then appropriate key-frames are extracted in each subshot by SVD decomposition. Finally, three evaluation indicators are proposed to evaluate the performance of the new approach. Experimental results show that the proposed approach achieves good semantic structure for semantics-based video index and meanwhile produces video summary consistent with human perception.

Lei, Shaoshuai; Xie, Gang; Yan, Gaowei

2014-01-01

399

VBR video: tradeoffs and potentials  

Microsoft Academic Search

The authors examine the transport and storage of video compressed with a variable bit rate (VBR). They focus primarily on networked video, although they also briefly consider other applications of VBR video, including satellite transmission (channel sharing), playback of stored video, and wireless transport. Packet video research requires careful integration between the network and the video systems; however, a major

T.V. Lakshman; ANTONIO ORTEGA; AMY R. REIBMAN

1998-01-01

400

Next-generation Sequencing of Advanced Prostate Cancer Treated with Androgen-deprivation Therapy  

PubMed Central

Background Androgen-deprivation therapy (ADT) is standard treatment for locally advanced or metastatic prostate cancer (PCa). Many patients develop castration resistance (castration-resistant PCa [CRPC]) after approximately 2–3 yr, with a poor prognosis. The molecular mechanisms underlying CRPC progression are unclear. Objective To undertake quantitative tumour transcriptome profiling prior to and following ADT to identify functionally important androgen-regulated pathways or genes that may be reactivated in CRPC. Design, setting, and participants RNA sequencing (RNA-seq) was performed on tumour-rich, targeted prostatic biopsies from seven patients with locally advanced or metastatic PCa before and approximately 22 wk after ADT initiation. Differentially regulated genes were identified in treatment pairs and further investigated by quantitative reverse transcription-polymerase chain reaction (qRT-PCR) on cell lines and immunohistochemistry on a separate CRPC patient cohort. Functional assays were used to determine the effect of pathway modulation on cell phenotypes. Outcome measurements and statistical analysis We searched for gene expression changes affecting key cell signalling pathways that may be targeted as proof of principle in a CRPC in vitro cell line model. Results and limitations We identified ADT-regulated signalling pathways, including the Wnt/?-catenin signalling pathway, and observed overexpression of ?-catenin in a subset of CRPC by immunohistochemistry. We validated 6 of 12 (50%) pathway members by qRT-PCR on LNCaP/LNCaP-AI cell RNAs, of which 4 (67%) demonstrated expression changes consistent with RNA-seq data. We show that the tankyrase inhibitor XAV939 (which promotes ?-catenin degradation) reduced androgen-independent LNCaP-AI cell line growth compared with androgen-responsive LNCaP cells via an accumulation of cell proportions in the G0/G1 phase and reduction in the S and G2/M phases. Our biopsy protocol did not account for tumour heterogeneity, and pathway inhibition was limited to pharmacologic approaches. Conclusions RNA-seq of paired PCa samples revealed ADT-regulated signalling pathways. Proof-of-principle inhibition of the Wnt/?-catenin signalling pathway specifically delays androgen-independent PCa cell cycle progression and proliferation and warrants further investigation as a potential target for therapy for CRPC.

Rajan, Prabhakar; Sudbery, Ian M.; Villasevil, M. Eugenia M.; Mui, Ernest; Fleming, Janis; Davis, Mark; Ahmad, Imran; Edwards, Joanne; Sansom, Owen J.; Sims, David; Ponting, Chris P.; Heger, Andreas; McMenemin, Rhona M.; Pedley, Ian D.; Leung, Hing Y.

2014-01-01

401

Analytical procedures for estimating structural response to acoustic fields generated by advanced launch systems, phase 2  

NASA Technical Reports Server (NTRS)

This report supplements a previous report of the same title submitted in June, 1992. It summarizes additional analytical techniques which have been developed for predicting the response of linear and nonlinear structures to noise excitations generated by large propulsion power plants. The report is divided into nine chapters. The first two deal with incomplete knowledge of boundary conditions of engineering structures. The incomplete knowledge is characterized by a convex set, and its diagnosis is formulated as a multi-hypothesis discrete decision-making algorithm with attendant criteria of adaptive termination.

Elishakoff, Isaac; Lin, Y. K.; Zhu, Li-Ping; Fang, Jian-Jie; Cai, G. Q.

1994-01-01

402

The 400-Hz aircraft power-generation systems: Advancing the baseline  

NASA Technical Reports Server (NTRS)

Today's benchmark system for the Boeing 757/767/A310 airplanes and future trends in hydromechanical aircraft power generating systems are discussed. The 757/767/A310 system represents the commercial state of the art and the direction in which Sundstrand Corp. is headed, particularly in regard to weight reduction. Sundstrand introduced microprocessor control in an in service system in the Boeing 767 and was the first to use databus communications between the controls. Plans to develop this technology are briefly discussed. Alternative ways to produce and use power in aircraft are discussed. The integrated starter drive is discussed.

Glennon, T.

1983-01-01

403

Validation Specialist Video  

NSDL National Science Digital Library

The Northeast Biomanufacturing Center and Collaborative (NBC2) has created a series of videos in which technicians describe their job and the preparation they received for it. These videos are great tools for other manufacturing programs to educate current students on options available to them after they graduate and the skills or courses they found most applicable to their real world experience. In this particular video, Validation Specialist Dennis Woodby discusses his background, education, job search, and the skills he has found to be useful in job hunting. This video is 4:18 long, is in Windows Media Video (wmv) format, and can be played with Quicktime or Windows Media Player.

2009-10-01

404

Female Validation Specialist Video  

NSDL National Science Digital Library

The Northeast Biomanufacturing Center and Collaborative (NBC2) has created a series of videos in which technicians describe their job and the preparation they received for it. These videos are great tools for other manufacturing programs to educate current students on options available to them after they graduate and the skills or courses they found most applicable to their real world experience. In this particular video, Validation Specialist Victoria Kelley discusses her education, her job search, and the experiences of her current position, including the travel involved. This video is 6:43 long, is in Windows Media Video (wmv) format, and can be played with Quicktime or Windows Media Player.

2009-10-01

405

Application of high temperature air heaters to advanced power generation cycles  

SciTech Connect

Recent developments in ceramic composite materials open up the possibility of recuperative air heaters heating air to temperatures well above the feasible with metal tubes. A high temperature air heater (HTAH) has long been recognized as a requirement for the most efficient MHD plants in order to reach high combustor flame temperatures. The application of gas turbines in coal-fired plants of all types has been impeded because of the problems in cleaning exhaust gas sufficiently to avoid damage to the turbine. With a possibility of a HTAH, such plants may become feasible on the basis of air turbine cycles, in which air is compressed and heated in the HTAH before being applied to turbine. The heat exchanger eliminates the need for the hot gas cleanup system. The performance improvement potential of advanced cycles with HTAH application including the air turbine cycle in several variations such as the DOE program on ``Coal-Fired Air Furnace Combined Cycle...,`` variations originated by the authors, and the MHD combined cycle are presented. The status of development of ceramic air heater technology is included.

Thompson, T.R. [Tennessee Valley Authority, Chattanooga, TN (United States); Boss, W.H.; Chapman, J.N. [Tennessee Univ., Tullahoma, TN (United States). Space Inst.

1992-03-01

406

Applications study of advanced power generation systems utilizing coal-derived fuels. Volume 1: Executive summary  

NASA Astrophysics Data System (ADS)

The technology status of phosphoric acid and molten carbon fuel cells, combined gas and steam turbine cycles, and magnetohydrodynamic energy conversion systems was assessed and the power performance of these systems when operating with medium-Btu fuel gas whether delivered by pipeline to the power plant or in an integrated mode in which the coal gasification process and power system are closely coupled as an overall power plant was evaluated. Commercially available combined-cycle gas turbine systems can reach projected required performance levels for advanced systems using currently available technology. The phosphoric acid fuel cell appears to be the next most likely candidate for commercialization. On pipeline delivery, the systems efficiency ranges from 40.9% for the phosphoric acid fuel cell to 63% for the molten carbonate fuel cell system. The efficiencies of the integrated power plants vary from approximately 39-40% for the combined cycle to 46-47% for the molden carbonate fuel cell systems. Conventional coal-fired steam stations with flue-gas desulfurization have only 33-35% efficiency.

Robson, F. L.

1981-03-01

407

Application of high temperature air heaters to advanced power generation cycles  

SciTech Connect

Recent developments in ceramic composite materials open up the possibility of recuperative air heaters heating air to temperatures well above the feasible with metal tubes. A high temperature air heater (HTAH) has long been recognized as a requirement for the most efficient MHD plants in order to reach high combustor flame temperatures. The application of gas turbines in coal-fired plants of all types has been impeded because of the problems in cleaning exhaust gas sufficiently to avoid damage to the turbine. With a possibility of a HTAH, such plants may become feasible on the basis of air turbine cycles, in which air is compressed and heated in the HTAH before being applied to turbine. The heat exchanger eliminates the need for the hot gas cleanup system. The performance improvement potential of advanced cycles with HTAH application including the air turbine cycle in several variations such as the DOE program on Coal-Fired Air Furnace Combined Cycle...,'' variations originated by the authors, and the MHD combined cycle are presented. The status of development of ceramic air heater technology is included.

Thompson, T.R. (Tennessee Valley Authority, Chattanooga, TN (United States)); Boss, W.H.; Chapman, J.N. (Tennessee Univ., Tullahoma, TN (United States). Space Inst.)

1992-01-01

408

Applications study of advanced power generation systems utilizing coal-derived fuels. Volume 1: Executive summary  

NASA Technical Reports Server (NTRS)

The technology status of phosphoric acid and molten carbon fuel cells, combined gas and steam turbine cycles, and magnetohydrodynamic energy conversion systems was assessed and the power performance of these systems when operating with medium-Btu fuel gas whether delivered by pipeline to the power plant or in an integrated mode in which the coal gasification process and power system are closely coupled as an overall power plant was evaluated. Commercially available combined-cycle gas turbine systems can reach projected required performance levels for advanced systems using currently available technology. The phosphoric acid fuel cell appears to be the next most likely candidate for commercialization. On pipeline delivery, the systems efficiency ranges from 40.9% for the phosphoric acid fuel cell to 63% for the molten carbonate fuel cell system. The efficiencies of the integrated power plants vary from approximately 39-40% for the combined cycle to 46-47% for the molden carbonate fuel cell systems. Conventional coal-fired steam stations with flue-gas desulfurization have only 33-35% efficiency.

Robson, F. L.

1981-01-01

409

Arginine-derived advanced glycation end products generated in Peptide-glucose mixtures during boiling.  

PubMed

Glycation refers to the reaction of amino groups, for example in proteins, with reducing sugars. Intermediately formed Amadori products can be degraded by oxidation (Maillard reactions) leading to a heterogeneous class of advanced glycation end-products (AGEs), especially during exposure to heat. AGEs are considered to be toxic in vivo due to their pronounced local and systemic inflammatory effects. At high temperatures, these reactions have been mostly investigated at the amino acid level. Here, we studied the formation of arginine-related AGEs in peptides under conditions simulating household cooking at physiological d-glucose concentrations. High quantities of AGE-modified peptides were produced within 15 min, especially glyoxal-derived products. The intermediately formed dihydroxy-imidazolidine yielded glyoxal- (Glarg) and methylglyoxal-derived hydro-imidazolinones (MG-H), with Glarg being further degraded to carboxymethyl-l-arginine (CMA). Carboxyethyl-l-arginine was not detected. The formation rates and yields were strongly increased in the presence of physiologically relevant concentrations of Fe(II)-ions and ascorbate. A nearby histidine residue increased the content of AGEs, whereas glutamic acid significantly reduced the CMA levels. PMID:24725187

Frolov, Andrej; Schmidt, Rico; Spiller, Sandro; Greifenhagen, Uta; Hoffmann, Ralf

2014-04-23

410

VISSTM: : A Video Intelligent Surveillance System  

NASA Astrophysics Data System (ADS)

Video surveillance is gaining increasing popularity as a possible response to various threats such as terrorism, vandalism and crime. The need for automated analysis of the events monitored by video cameras and support for fast search and browsing of such recorded video data is evident. In this paper we present VISSTM, a prototype system that uses advanced video segmentation and MPEG-7 technology to analyse and index visual events in real time. Visual features such as shape, colour and texture are extracted and used to describe the images stored on the system. A search of large volumes of data can be performed very quickly. We show examples of the fast search made possible with VISSTM.

Berriss, William P.; Price, Wayne G.; Bober, Miroslaw Z.

2002-10-01

411

Real-time video streaming using H.264 scalable video coding (SVC) in multihomed mobile networks: a testbed approach  

NASA Astrophysics Data System (ADS)

Users of the next generation wireless paradigm known as multihomed mobile networks expect satisfactory quality of service (QoS) when accessing streamed multimedia content. The recent H.264 Scalable Video Coding (SVC) extension to the Advanced Video Coding standard (AVC), offers the facility to adapt real-time video streams in response to the dynamic conditions of multiple network paths encountered in multihomed wireless mobile networks. Nevertheless, preexisting streaming algorithms were mainly proposed for AVC delivery over multipath wired networks and were evaluated by software simulation. This paper introduces a practical, hardware-based testbed upon which we implement and evaluate real-time H.264 SVC streaming algorithms in a realistic multihomed wireless mobile networks environment. We propose an optimised streaming algorithm with multi-fold technical contributions. Firstly, we extended the AVC packet prioritisation schemes to reflect the three-dimensional granularity of SVC. Secondly, we designed a mechanism for evaluating the effects of different streamer 'read ahead window' sizes on real-time performance. Thirdly, we took account of the previously unconsidered path switching and mobile networks tunnelling overheads encountered in real-world deployments. Finally, we implemented a path condition monitoring and reporting scheme to facilitate the intelligent path switching. The proposed system has been experimentally shown to offer a significant improvement in PSNR of the received stream compared with representative existing algorithms.

Nightingale, James; Wang, Qi; Grecos, Christos

2011-02-01

412

AIDS/HIV Educational Video Clips (VHS 1/2 inch and text) (Video).  

National Technical Information Service (NTIS)

The videotape provides a series of seven brief (one-two minutes each) video clips of medical center situations to help generate discussion of major concerns surrounding HIV/AIDS. Situations were developed by VA clinicians and educators.

1993-01-01

413

FM video data link spectrum spreading  

NASA Astrophysics Data System (ADS)

A video data link system utilizes spread spectrum to decrease the susceptibility of a low power video link to radio frequency countermeasures. The video data link system utilizes a combination of spread spectrum direct-sequence modulation and frequency-hop along with frequency modulation to provide spectral spreading of radio frequency energy to a bandwidth much greater than the information bandwidth. The direct sequence modulation allows minimization of the number of frequency steps required for complete spectral filling of the operational bandwidth on an average basis. Frequency hop timing is determined from the phase of the direct sequence generator to simplify the frequency hop synchronization process in the receiver.

Holliday, Edward M.; Kirshtein, Phillip M.; Weathers, Glenn D.

1991-10-01

414

More About The Video Event Trigger  

NASA Technical Reports Server (NTRS)

Report presents additional information about system described in "Video Event Trigger" (LEW-15076). Digital electronic system processes video-image data to generate trigger signal when image shows significant change, such as motion, or appearance, disappearance, change in color, brightness, or dilation of object. Potential uses include monitoring of hallways, parking lots, and other areas during hours when supposed unoccupied, looking for fires, tracking airplanes or other moving objects, identification of missing or defective parts on production lines, and video recording of automobile crash tests.

Williams, Glenn L.

1996-01-01

415

Multiview video compression and streaming based on predicted viewer position  

Microsoft Academic Search

Recent technological advances have made possible a number of new applications in the area of 3D video. One of the enabling tech- nologies for many of these 3D applications is multiview video cod- ing, which has received significant attention in the last several years. However, the fundamental need of multiview coding for applications like immersive tele-conferencing has not been addressed.

Dinei A. F. Florêncio; Cha Zhang

2009-01-01

416

Energy-efficient wireless video coding and delivery  

Microsoft Academic Search

Transmitting video over wireless channels from mobile devices has gained increased popularity in a wide range of applications. A major obstacle in these types of applications is the limited energy supply in mobile device batteries. For this reason, efficiently utilizing energy is a critical issue in designing wireless video communication systems. This article highlights recent advances in joint source coding

AGGELOS K. KATSAGGELOS; Fan Zhai; Y. Eisenberg; R. Berry

2005-01-01

417

VideoLab: Optogenetic Pacemaker  

NSDL National Science Digital Library

In mammals, the heart's primary pacemaker lies in a specialized group of cells -- but do non-mammalian vertebrates have a similar control system? To find out, Arrenberg et al. genetically engineered zebrafish to express light-sensitive proteins, and then used light beams generated with a digital micromirror device to locate and manipulate the function of the pacemaker cells in the hearts of zebrafish embryos -- capturing the action on high-speed video.

Aristides B. Arrenberg (University of California; University of Freiburg;Department of Physiology; Institute of Biology); Didier Y. R. Stainier (University of California;Department of Biochemistry and Biophysics and Cardiovascular Research Institute); Herwig Baier (University of California;Department of Physiology); Jan Huisken (University of California; Max Planck Institute of Molecular Cell Biology and Genetics;Department of Biochemistry and Biophysics and Cardiovascular Research Institute)

2010-11-12

418

A rule-based expert system for generating control displays at the Advanced Photon Source  

NASA Astrophysics Data System (ADS)

The integration of a rule-based expert system for generating screen displays for controlling and monitoring instrumentation under the Experimental Physics and Industrial Control System (EPICS) is presented. The expert system is implemented using CLIPS, an expert system shell from the Software Technology Branch at Lyndon B. Johnson Space Center. The user selects the hardware input and output to be displayed and the expert system constructs a graphical control screen appropriate for the data. Such a system provides a method for implementing a common look and feel for displays created by several different users and reduces the amount of time required to create displays for new hardware configurations. Users are able to modify the displays as needed using the EPICS display editor tool.

Coulter, Karen J.

1994-12-01

419

Advances in understanding of the mechanism for generation of earthquake thermal precursors detected by satellites  

NASA Astrophysics Data System (ADS)

Stresses building up during an earthquake preparation phase also manifest themselves in the form of a so called increased land surface temperature (LST) leading to a thermal precursor prior to the earthquake event. This phenomenon has now been validated by our observations of short-term thermal anomalies detected by infrared satellite sensors for several recent past earthquakes around the world. The rise in infrared radiance temperature was seen to vary between 5 and 12 °C for different earthquakes. We discuss in this paper different explanations for the generation of such anomalies that have been offered. Emission of gases due to the opening and closure of micropores upon induced stresses and also the participation of ground water have been propounded as a possible cause for generation of thermal anomalies. Seismo-ionosphere coupling, by which gases like radon move to the earth-atmosphere interface and cause air ionization thus bringing about a change in air temperature, relative humidity, etc., has been put forth by some workers. A mechanism of low frequency electromagnetic emission was tested and experimented by scientists with rock masses in stressed conditions as those that exist at tectonic locations. The workers proposed the positive hole pair theory, which received support from several scientific groups. Positive holes (sites of electron deficiency) are activated in stressed rocks from pre-existing yet dormant positive hole pairs (PHPs) and their recombination at rock-air interface leads to a LST rise. A combination of remote sensing detection of rock mechanics behavior with a perception of chemistry and geophysics has been applied to propose the remote sensing rock mechanics theory. Remote sensing detections of such anomalies confirm so far proposed lab theories for such a hotly debated field as earthquake precursor study by providing unbiased observations with consistency in time and space distribution.

Saraf, Arun K.; Rawat, Vineeta; Choudhury, Swapnamita; Dasgupta, Sudipta; Das, Josodhir

2009-12-01

420

Toward the Next Generation of Negative Symptom Assessments: The Collaboration to Advance Negative Symptom Assessment in Schizophrenia  

PubMed Central

Negative symptoms in schizophrenia are related to poor functional outcome, persistent over time, a source of burden for caregivers, and only minimally responsive to currently available medications. A major challenge to developing efficacious interventions concerns the valid and reliable assessment of negative symptoms. In a recent consensus statement on negative symptoms, a central recommendation was the need to develop new assessment approaches that address the limitations of existing instruments. In the current report, we summarize the background and rationale for the Collaboration to Advance Negative Symptom Assessment in Schizophrenia (CANSAS). The CANSAS project is an National Institute of Mental Health-funded multisite study that is constructing a next-generation negative symptom scale, the Clinical Assessment Interview for Negative Symptoms (CAINS). The CAINS is being developed within a data-driven iterative process that seeks to ensure the measure’s reliability, validity, and utility for both basic psychopathology and treatment development research.

Blanchard, Jack J.; Kring, Ann M.; Horan, William P.; Gur, Raquel

2011-01-01

421

Rivizor--a new third-generation aromatase inhibitor for the treatment of advanced breast cancer after tamoxifen failure.  

PubMed

Rivizor (vorozole) is a new, highly potent and selective third-generation aromatase inhibitor for treatment of advanced breast cancer. In an open-label study, 30 postmenopausal women failing tamoxifen therapy received Rivizor 2.5 mg once daily until disease progression. Rivizor produced clinical benefit (partial response or no change) in 16 of 27 evaluable patients (59.3%). Five patients (18.5%) had a partial response (UICC criteria) which lasted for a median of 15 months (range 14-42.5 months), 11 patients had disease stabilization for a median of 14 months (7-24 months), and 11 patients had disease progression. Median time to first response was 3.9 months (3-27.5 months): estimated median survival time for all patients was 22.8 months (2-52.8 months) and estimated median time to disease progression was 10.8 months (1.4-42.4 months). Estradiol levels decreased to below limits of detection from 1st month of treatment until study end. Androstenedione, 17alpha-hydroxyprogesterone, dehydroepiandrosterone, and free-testosterone levels were unaffected by Rivizor. ACTH stimulation tests demonstrated that Rivizor does not interfere with adrenal mineralocorticoid and glucocorticoid steroid synthesis. Adverse events were mild-to-moderate. Rivizor might be an effective and well-tolerated alternative treatment for postmenopausal advanced breast cancer patients following tamoxifen failure. PMID:9949297

Goss, P E; Walde, D; De Coster, R; Langenaeken, C; Bruynseels, J

1999-01-01

422

Supporting Development for the Stirling Radioisotope Generator and Advanced Stirling Technology Development at NASA Glenn Research Center  

NASA Technical Reports Server (NTRS)

A high-efficiency, 110-We (watts electric) Stirling Radioisotope Generator (SRG110) for possible use on future NASA Space Science missions is being developed by the Department of Energy, Lockheed Martin, Stirling Technology Company (STC), and NASA Glenn Research Center (GRC). Potential mission use includes providing spacecraft onboard electric power for deep space missions and power for unmanned Mars rovers. GRC is conducting an in-house supporting technology project to assist in SRG110 development. One-, three-, and six-month heater head structural benchmark tests have been completed in support of a heater head life assessment. Testing is underway to evaluate the key epoxy bond of the permanent magnets to the linear alternator stator lamination stack. GRC has completed over 10,000 hours of extended duration testing of the Stirling convertors for the SRG110, and a three-year test of two Stirling convertors in a thermal vacuum environment will be starting shortly. GRC is also developing advanced technology for Stirling convertors, aimed at substantially improving the specific power and efficiency of the convertor and the overall generator. Sunpower, Inc. has begun the development of a lightweight Stirling convertor, under a NASA Research Announcement (NRA) award, that has the potential to double the system specific power to about 8 We/kg. GRC has performed random vibration testing of a lower-power version of this convertor to evaluate robustness for surviving launch vibrations. STC has also completed the initial design of a lightweight convertor. Status of the development of a multi-dimensional computational fluid dynamics code and high-temperature materials work on advanced superalloys, refractory metal alloys, and ceramics are also discussed.

Thieme, Lanny G.; Schreiber, Jeffrey G.

2005-01-01

423

Application of advanced grid generation techniques for flow field computations about complex configurations  

NASA Technical Reports Server (NTRS)

In the computation of flowfields about complex configurations, it is very difficult to construct a boundary-fitted coordinate system. An alternative approach is to use several grids at once, each of which is generated independently. This procedure is called the multiple grids or zonal grids approach; its applications are investigated. The method conservative providing conservation of fluxes at grid interfaces. The Euler equations are solved numerically on such grids for various configurations. The numerical scheme used is the finite-volume technique with a three-stage Runge-Kutta time integration. The code is vectorized and programmed to run on the CDC VPS-32 computer. Steady state solutions of the Euler equations are presented and discussed. The solutions include: low speed flow over a sphere, high speed flow over a slender body, supersonic flow through a duct, and supersonic internal/external flow interaction for an aircraft configuration at various angles of attack. The results demonstrate that the multiple grids approach along with the conservative interfacing is capable of computing the flows about the complex configurations where the use of a single grid system is not possible.

Kathong, Monchai; Tiwari, Surendra N.

1988-01-01

424

Advancement in eddy current test technology for steam generator tube inspection  

SciTech Connect

The Oak Ridge National Laboratory (ORNL) is developing and improving eddy current inspection methods for steam generator tubes in the nuclear industry. The authors have improved the fit and accuracy of the automatic analysis of eddy current data by the use of a back propagation method for fitting instrument readings to test properties. In addition, they have written software that performs an analysis similar to some industry standard analyses, which allows the ORNL and industry analyses to be compared. Their automatic analysis can be applied immediately to the detection of probe wear. They have interfaced their analysis programs to the Zetec MIZ-18, and interfaced their IBM PC-AT clones to the Hewlett Packard computer system used for industry standard data analysis. They can now analyze industry plant inspection data on optical disks using the ORNL multiple property methods. A supplementary method, a neural network method that looks directly at the raw images and will correctly categorize the defects, has been developed. Although this method has not been as thoroughly developed as the multiple property method, it has performed very well on a limited set of samples.

Dodd, C.V.; Pate, J.R.; Allen, J.D. (Oak Ridge National Lab., TN (United States))

1995-01-01

425

Advanced unidirectional photocurrent generation via cytochrome c as reaction partner for directed assembly of photosystem I.  

PubMed

Conversion of light into an electrical current based on biohybrid systems mimicking natural photosynthesis is becoming increasingly popular. Photosystem I (PSI) is particularly useful in such photo-bioelectrochemical devices. Herein, we report on a novel biomimetic approach for an effective assembly of photosystem I with the electron transfer carrier cytochrome c (cyt c), deposited on a thiol-modified gold-surface. Atomic force microscopy and surface plasmon resonance measurements have been used for characterization of the assembly process. Photoelectrochemical experiments demonstrate a cyt c mediated generation of an enhanced unidirectional cathodic photocurrent. Here, cyt c can act as a template for the assembly of an oriented and dense layer of PSI and as wiring agent to direct the electrons from the electrode towards the photosynthetic reaction center of PSI. Furthermore, three-dimensional protein architectures have been formed via the layer-by-layer deposition technique resulting in a successive increase in photocurrent densities. An intermittent cyt c layer is essential for an efficient connection of PSI layers with the electrode and for an improvement of photocurrent densities. PMID:24957935

Stieger, Kai R; Feifel, Sven C; Lokstein, Heiko; Lisdat, Fred

2014-07-01

426

Parametric Analysis of a Hover Test Vehicle using Advanced Test Generation and Data Analysis  

NASA Technical Reports Server (NTRS)

Large complex aerospace systems are generally validated in regions local to anticipated operating points rather than through characterization of the entire feasible operational envelope of the system. This is due to the large parameter space, and complex, highly coupled nonlinear nature of the different systems that contribute to the performance of the aerospace system. We have addressed the factors deterring such an analysis by applying a combination of technologies to the area of flight envelop assessment. We utilize n-factor (2,3) combinatorial parameter variations to limit the number of cases, but still explore important interactions in the parameter space in a systematic fashion. The data generated is automatically analyzed through a combination of unsupervised learning using a Bayesian multivariate clustering technique (AutoBayes) and supervised learning of critical parameter ranges using the machine-learning tool TAR3, a treatment learner. Covariance analysis with scatter plots and likelihood contours are used to visualize correlations between simulation parameters and simulation results, a task that requires tool support, especially for large and complex models. We present results of simulation experiments for a cold-gas-powered hover test vehicle.

Gundy-Burlet, Karen; Schumann, Johann; Menzies, Tim; Barrett, Tony

2009-01-01

427

NGA's use of aerogravity to advance the next generation of Earth Gravitational Models  

NASA Astrophysics Data System (ADS)

NGA has a long history of using aerogravity to improve existing knowledge of the world's gravity field, particularly over remote and inaccessible areas of the earth. Recent and on-going airborne campaigns include projects over Ethiopia, Nepal, Alaska, Tanzania, Antarctica, Indonesia, Mongolia, Afghanistan and the Arctic. Many of these datasets have already contributed to the development of improved national and regional geoid models. Comparisons of these geoid models against independent data serves as a useful quality check on the input aerogravity. Additionally, NGA is using the new airborne data to update their global terrestrial gravity anomaly file. NGA is forming harmonic models of this new aerogravity-enhanced data file and comparing these against the corresponding anomaly file used to develop EGM08, particularly in terms of their relative agreement with new satellite models in the long wavelength band. Initial results show clear improvement over the newly surveyed areas. This type of analysis highlights other regions which would also benefit from new aerogravity campaigns. Ultimately, this new and future data will propagate into NGA's next generation of earth gravitational models, thereby supporting the realization of an improved World Vertical Height System.

Kenyon, S. C.; Forsberg, R.; Olesen, A. V.; Holmes, S. A.

2012-12-01

428

Genome Sequencing Center Tour Videos and Classroom Activities  

NSDL National Science Digital Library

A video tour of the Washington University Genome Sequencing CenterâÂÂsupplemented by additional films and classroom activitiesâÂÂcan help advanced high school students and college undergraduates understand the classical techniques of genome sequencing.

Sarah Elgin (Washington University;)

2010-05-28

429

Feature-preserving image/video compression  

NASA Astrophysics Data System (ADS)

Advances in digital image processing, the advents of multimedia computing, and the availability of affordable high quality digital cameras have led to increased demand for digital images/videos. There has been a fast growth in the number of information systems that benefit from digital imaging techniques and present many tough challenges. In this paper e are concerned with applications for which image quality is a critical requirement. The fields of medicine, remote sensing, real time surveillance, and image-based automatic fingerprint/face identification systems are all but few examples of such applications. Medical care is increasingly dependent on imaging for diagnostics, surgery, and education. It is estimated that medium size hospitals in the US generate terabytes of MRI images and X-Ray images are generated to be stored in very large databases which are frequently accessed and searched for research and training. On the other hand, the rise of international terrorism and the growth of identity theft have added urgency to the development of new efficient biometric-based person verification/authentication systems. In future, such systems can provide an additional layer of security for online transactions or for real-time surveillance.

Al-Jawad, Naseer; Jassim, Sabah

2005-10-01

430

Second-Generation UMTRI Coding Scheme for Classifying Driver Tasks in Distraction Studies and Application to the Avoidance System (ACAS) Field Operational Test (FOT) Video Clips.  

National Technical Information Service (NTIS)

This report describes the development of a new coding scheme to classify potentially distracting secondary tasks performed while driving, such as eating and using a cell phone. Compared with prior schemes (Stutts et al., first-generation UMTRI scheme), th...

J. Oberholtzer J. Schweitzer L. Nguyen P. Green S. Yee

2006-01-01

431

Advanced technologies in the ASI MLRO towards a new generation laser ranging system  

NASA Astrophysics Data System (ADS)

Matera Laser Ranging Observatory (MLRO) is a high performance, highly automated optical and astronomical observatory currently under design and development by AlliedSignal for the Italian Space Agency (ASI). It is projected to become operational at the Centro Geodesia Spaziale in Matera, Italy, in 1997. MLRO, based on a 1.5-meter astronomical quality telescope, will perform ranging to spacecraft in earthbound orbits, lunar reflectors, and specially equipped deep space missions. The primary emphasis during design is to incorporate state-of-the-art technologies to produce an intelligent, automated, high accuracy ranging system that will mimic the characteristic features of a fifth generation laser ranging system. The telescope has multiple ports and foci to support future experiments in the areas of laser communications, lidar, astrometry, etc. The key features providing state-of-the-art ranging performance include: a diode-pumped picosecond (50 ps) laser, high speed (3-5 GHz) optoelectronic detection and signal processing, and a high accuracy (6 ps) high resolution (less than 2 ps) time measurement capability. The above combination of technologies is expected to yield millimeter laser ranging precision and accuracy on targets up to 300,000 km, surpassing the best operational instrument performance to date by a factor of five or more. Distributed processing and control using a state-of-the-art computing environment provides the framework for efficient operation, system optimization, and diagnostics. A computationally intelligent environment permits optimal planning, scheduling, tracking, and data processing. It also supports remote access, monitor, and control for joint experiments with other observatories.

Varghese, Thomas; Bianco, Giuseppe

1994-11-01

432

Advanced technologies in the ASI MLRO towards a new generation laser ranging system  

NASA Technical Reports Server (NTRS)

Matera Laser Ranging Observatory (MLRO) is a high performance, highly automated optical and astronomical observatory currently under design and development by AlliedSignal for the Italian Space Agency (ASI). It is projected to become operational at the Centro Geodesia Spaziale in Matera, Italy, in 1997. MLRO, based on a 1.5-meter astronomical quality telescope, will perform ranging to spacecraft in earthbound orbits, lunar reflectors, and specially equipped deep space missions. The primary emphasis during design is to incorporate state-of-the-art technologies to produce an intelligent, automated, high accuracy ranging system that will mimic the characteristic features of a fifth generation laser ranging system. The telescope has multiple ports and foci to support future experiments in the areas of laser communications, lidar, astrometry, etc. The key features providing state-of-the-art ranging performance include: a diode-pumped picosecond (50 ps) laser, high speed (3-5 GHz) optoelectronic detection and signal processing, and a high accuracy (6 ps) high resolution (less than 2 ps) time measurement capability. The above combination of technologies is expected to yield millimeter laser ranging precision and accuracy on targets up to 300,000 km, surpassing the best operational instrument performance to date by a factor of five or more. Distributed processing and control using a state-of-the-art computing environment provides the framework for efficient operation, system optimization, and diagnostics. A computationally intelligent environment permits optimal planning, scheduling, tracking, and data processing. It also supports remote access, monitor, and control for joint experiments with other observatories.

Varghese, Thomas; Bianco, Giuseppe

1994-01-01

433

Design and implementation of high-performance video processor for head-mounted displays  

Microsoft Academic Search

This paper presents the design of a high-performance processor used for head-mounted display (HMD) applications targeting stereo video processing. The proposed hardware architecture of the video processor consists of three major parts: an adaptive 3-dimensional (3D) video decoder to accurately decoding the stereo composite video base band signal (CVBS) source, a video source separation module to generate the 3D display

Hou Zuoxun; Ge Chenyang; Zhao Wenzhe; Liu Longjun; Zheng Nanning

2011-01-01

434

Design-based metrology: advanced automation for CD-SEM recipe generation  

NASA Astrophysics Data System (ADS)

The procedure for properly implementing OPC for a new technology node or chip design involves multiple steps: selection of the RET (resolution enhance technique), selection of design rules, OPC Model Building, OPC Verification, CD control quantification (across chip, reticle, wafer, focus, exposure, etc), calibration of Optical Rule Checks (ORC), and other verification steps. Many of these steps require up to thousands of wafer measurements, and while state-of-the-art CD-SEM tools provide automated metrology for production, manually creating a CD recipe with thousands of unique sites is extremely tedious and error-prone. This places a practical limit on both the quality and number of measurements that can be acquired during the technology development and qualification period. At the same time, the number of measurements required to qualify a new reticle design has increased drastically due to the growing complexity of RET and diminishing tolerances. To meet this challenge, a direct and automated link from the design systems to the process metrology tools is needed. Novel methodologies must also be developed to enable automated generation of teh recipe from the design inputs and to translate the flood of metrology results into information that can improve the design, mask data processing, or the patterning process. To facilitate this two-way data flow, a new framework has been created enabling true Design-Based Metrology (DBM), and an application named OPC-Check has been developed to operate within this framework. This DBM framework provides the common language and interface that facilitates the direct transfer of desired measurement locations from teh design to the metrology tool. This link is a critical element in Design for Manufacturability (DFM) efforts, a central theme in many presentations at Microlithography 2005. This article discusses the significant benefits of the tight integration of design and process metrology for OPC implementation in a new technology node, and provides some examples of the novel OPC-Check application as currently implemented at AMD SDC with Applied Materials CD-SEM tools.

Tabery, C.; Capodieci, L.; Haidinyak, C.; Shah, K.; Threefoot, M.; Choo, B.; Singh, B.; Nehmadi, Y.; Ofek, C.; Menadeva, O.; Ben-Porath, A.

2005-05-01

435

Video Toroid Cavity Imager  

DOEpatents

A video toroid cavity imager for in situ measurement of electrochemical properties of an electrolytic material sample includes a cylindrical toroid cavity resonator containing the sample and employs NMR and video imaging for providing high-resolution spectral and visual information of molecular characteristics of the sample on a real-time basis. A large magnetic field is applied to the sample under controlled temperature and pressure conditions to simultaneously provide NMR spectroscopy and video imaging capabilities for investigating electrochemical transformations of materials or the evolution of long-range molecular aggregation during cooling of hydrocarbon melts. The video toroid cavity imager includes a miniature commercial video camera with an adjustable lens, a modified compression coin cell imager with a fiat circular principal detector element, and a sample mounted on a transparent circular glass disk, and provides NMR information as well as a video image of a sample, such as a polymer film, with micrometer resolution.

Gerald, Rex E. II; Sanchez, Jairo; Rathke, Jerome W.

2004-08-10

436

Oxfam International: Video  

NSDL National Science Digital Library

Oxfam, the British aid organization that banded together with a dozen other organizations in 1995 to form Oxfam International, has a website loaded with resources, one of which is a video library. There are many issues covered, such as climate change, tsunami survivors, AIDS, and many videos include celebrities, including Colin Firth, Scarlett Johansson, Helen Mirren, and Annie Lennox. To increase their reach, many of the videos are also available on Youtube. To view the video in fullscreen, click on the screen icon next to the speaker icon. One of the more heart wrenching videos is the one titled "Our Home After Sidr-Documentary from Oxfam." It is the abridged version of a documentary, but conveys, nonetheless the dire situation of these Bangladesh survivors. Visitors should also not miss short animated video "Face the Music" about climate change, which uses only music and animation to show how climate change hits the poor "first and worst."

437

A method of mobile video transmission based on J2ee  

NASA Astrophysics Data System (ADS)

As 3G (3rd-generation) networks evolve worldwide, the rising demand for mobile video services and the enormous growth of video on the internet is creating major new revenue opportunities for mobile network operators and application developers. The text introduced a method of mobile video transmission based on J2ME, giving the method of video compressing, then describing the video compressing standard, and then describing the software design. The proposed mobile video method based on J2EE is a typical mobile multimedia application, which has a higher availability and a wide range of applications. The users can get the video through terminal devices such as phone.

Guo, Jian-xin; Zhao, Ji-chun; Gong, Jing; Chun, Yang

2013-03-01

438

Robust video copy detection approach based on local tangent space alignment  

NASA Astrophysics Data System (ADS)

We propose a robust content-based video copy detection approach based on local tangent space alignment (LTSA), which is an efficient dimensionality reduction algorithm. The idea is motivated by the fact that the content of video becomes richer and the dimension of content becomes higher. It does not give natural tools for video analysis and understanding because of the high dimensionality. The proposed approach reduces the dimensionality of video content using LTSA, and then generates video fingerprints in low dimensional space for video copy detection. Furthermore, a dynamic sliding window is applied to fingerprint matching. Experimental results show that the video copy detection approach has good robustness and discrimination.

Nie, Xiushan; Qiao, Qianping

2012-04-01

439

VLSI-based video event triggering for image data compression  

NASA Technical Reports Server (NTRS)

Long-duration, on-orbit microgravity experiments require a combination of high resolution and high frame rate video data acquisition. The digitized high-rate video stream presents a difficult data storage problem. Data produced at rates of several hundred million bytes per second may require a total mission video data storage requirement exceeding one terabyte. A NASA-designed, VLSI-based, highly parallel digital state machine generates a digital trigger signal at the onset of a video event. High capacity random access memory storage coupled with newly available fuzzy logic devices permits the monitoring of a video image stream for long term (DC-like) or short term (AC-like) changes caused by spatial translation, dilation, appearance, disappearance, or color change in a video object. Pre-trigger and post-trigger storage techniques are then adaptable to archiving only the significant video images.

Williams, Glenn L.

1994-01-01

440

From Video to Photo  

NASA Technical Reports Server (NTRS)

Ever wonder whether a still shot from a home video could serve as a "picture perfect" photograph worthy of being framed and proudly displayed on the mantle? Wonder no more. A critical imaging code used to enhance video footage taken from spaceborne imaging instruments is now available within a portable photography tool capable of producing an optimized, high-resolution image from multiple video frames.

2004-01-01

441

Immersive panoramic video  

Microsoft Academic Search

IntroductionTelevision and video images pervade our professional and home environments. For over fiftyyears video images have provided a "virtual eye" into distant times and locations. Over the sameperiod, video technology has matured from gray-scale images to big-screen color and digitallyprocessed imagery. One aspect of both the delivery technology and the content creation hasremained largely unchanged however -- the view is

Ulrich Neumann; Thomas Pintaric; Albert A. Rizzo

2000-01-01

442

For Good Measure Video  

NSDL National Science Digital Library

This short video (2:01) uses an engaging approach to emphasize the importance of tracking and studying precipitation. The video cast explains how the Global Precipitation Measurement (GPM) mission will use a constellation of satellites to achieve global coverage, thereby providing scientists with accurate precipitation data from around the world. In addition to the video, the site contains supplemental text which provides background information on the GPM mission.

443

Video Demonstration: Proportions  

NSDL National Science Digital Library

This video demonstration from Watch Know Learn will help students learning about proportions. The video will help students with some knowledge of proportions by showing examples of how to solve them. The definition of a proportion is included as well as examples of how to cross-multiply to solve proportion problems. The demonstration shows what a non-proportion problem looks like and how to solve it as well as a few examples of using the lowest common denominator to solve proportions. Flash player is required to view the video, and the running time for the video is 8:09.

2012-01-01

444

User-oriented summary extraction for soccer video based on multimodal analysis  

NASA Astrophysics Data System (ADS)

An advanced user-oriented summary extraction method for soccer video is proposed in this work. Firstly, an algorithm of user-oriented summary extraction for soccer video is introduced. A novel approach that integrates multimodal analysis, such as extraction and analysis of the stadium features, moving object features, audio features and text features is introduced. By these features the semantic of the soccer video and the highlight mode are obtained. Then we can find the highlight position and put them together by highlight degrees to obtain the video summary. The experimental results for sports video of world cup soccer games indicate that multimodal analysis is effective for soccer video browsing and retrieval.

Liu, Huayong; Jiang, Shanshan; He, Tingting

2011-11-01

445

Songwriting and digital video production interventions for pediatric patients undergoing bone marrow transplantation, part II: An analysis of patient-generated songs and patient perceptions regarding intervention efficacy  

Microsoft Academic Search

Part I of this exploratory case study examined patient anxiety levels and depressive symptoms according to phase of bone marrow transplantation (BMT). The second part of this study examines more qualitative outcomes of the music therapy intervention. Purposes of this part of the study included: (1) to examine the lyrical content of patient-generated songs and (2) to compare patient perceptions

Sheri L. Robb; Allison G. Ebberts

2003-01-01

446

Progress in video immersion using Panospheric imaging  

NASA Astrophysics Data System (ADS)

Having demonstrated significant technical and marketplace advantages over other modalities for video immersion, PanosphericTM Imaging (PI) continues to evolve rapidly. This paper reports on progress achieved since AeroSense 97. The first practical field deployment of the technology occurred in June-August 1997 during the NASA-CMU 'Atacama Desert Trek' activity, where the Nomad mobile robot was teleoperated via immersive PanosphericTM imagery from a distance of several thousand kilometers. Research using teleoperated vehicles at DRES has also verified the exceptional utility of the PI technology for achieving high levels of situational awareness, operator confidence, and mission effectiveness. Important performance enhancements have been achieved with the completion of the 4th Generation PI DSP-based array processor system. The system is now able to provide dynamic full video-rate generation of spatial and computational transformations, resulting in a programmable and fully interactive immersive video telepresence. A new multi- CCD camera architecture has been created to exploit the bandwidth of this processor, yielding a well-matched PI system with greatly improved resolution. While the initial commercial application for this technology is expected to be video tele- conferencing, it also appears to have excellent potential for application in the 'Immersive Cockpit' concept. Additional progress is reported in the areas of Long Wave Infrared PI Imaging, Stereo PI concepts, PI based Video-Servoing concepts, PI based Video Navigation concepts, and Foveation concepts (to merge localized high-resolution views with immersive views).

Bogner, Stephen L.; Southwell, David T.; Penzes, Steven; Brosinsky, Chris A.; Anderson, Ron; Hanna, Doug M.

1998-09-01

447

Scalable mobile video question-answering system with locally aggregated descriptors and random projection  

Microsoft Academic Search

We present a scalable mobile video Question-Answering system with locally aggregated descriptors and random projection using user-generated videos all around the world for ACM Multimedia 2011 Technicolor challenge: \\

Guan-Long Wu; Yu-Chuan Su; Tzu-Hsuan Chiu; Liang-Chi Hsieh; Winston H. Hsu

2011-01-01

448

Video system characterization  

NASA Astrophysics Data System (ADS)

Video systems in military platforms are typically used to display sensor video and imagery for sensors such as forward looking infrared (FLIR), low light level television (LLLTV), synthetic aperture radar (SAR), and laser radar (LADAR), in addition to graphics and alphanumerics. The performance of these systems may need to be characterized during initial testing or in support a potential upgrade to the sensor. To be able to sense and deliver the best quality of video to the warfighter, it is critical that the system designer have a well-characterized video system, so he or she can make the appropriate performance, cost and schedule tradeoffs. Modulation Transfer Function (MTF) is one of several metrics that can be measured when characterizing a monochrome video system and can be very useful in optimizing the system for either initial design or for an upgrade. The use of MTF in determining resolution throughout a video system, including the application of useful metrics such as MTF area (MTFA) and square root integral (SQRI), is presented in this paper. Issues regarding hybrid video systems, which incorporate both analog and digital components in the video chain, are addressed. Practical methods for MTF testing of both displays and electrical components in the video chain are also presented. The paper discusses the practical application of video test patterns to perform an efficient component evaluation. The use of photometric testing of displays is touched on briefly. And lastly, the final topic to be addressed in this paper is the use of the time domain reflectometer in testing cables in the video chain for impedance mismatches.

Jackson, Timothy W.; Byrd, James C.; Harshbarger, John H.

1998-09-01

449

Orbital Express Advanced Video Guidance Sensor.  

National Technical Information Service (NTIS)

In May 2007 the first US fully autonomous rendezvous and capture was successfully performed by DARPA's Orbital Express (OE) mission. Since then, the Boeing ASTRO spacecraft and the Ball Aerospace NEXTSat have performed multiple rendezvous and docking mane...

A. Heaton C. Carrington R. Howard R. Pinson

2008-01-01

450

Identifying hidden voice and video streams  

NASA Astrophysics Data System (ADS)

Given the rising popularity of voice and video services over the Internet, accurately identifying voice and video traffic that traverse their networks has become a critical task for Internet service providers (ISPs). As the number of proprietary applications that deliver voice and video services to end users increases over time, the search for the one methodology that can accurately detect such services while being application independent still remains open. This problem becomes even more complicated when voice and video service providers like Skype, Microsoft, and Google bundle their voice and video services with other services like file transfer and chat. For example, a bundled Skype session can contain both voice stream and file transfer stream in the same layer-3/layer-4 flow. In this context, traditional techniques to identify voice and video streams do not work. In this paper, we propose a novel self-learning classifier, called VVS-I , that detects the presence of voice and video streams in flows with minimum manual intervention. Our classifier works in two phases: training phase and detection phase. In the training phase, VVS-I first extracts the relevant features, and subsequently constructs a fingerprint of a flow using the power spectral density (PSD) analysis. In the detection phase, it compares the fingerprint of a flow to the existing fingerprints learned during the training phase, and subsequently classifies the flow. Our classifier is not only capable of detecting voice and video streams that are hidden in different flows, but is also capable of detecting different applications (like Skype, MSN, etc.) that generate these voice/video streams. We show that our classifier can achieve close to 100% detection rate while keeping the false positive rate to less that 1%.

Fan, Jieyan; Wu, Dapeng; Nucci, Antonio; Keralapura, Ram; Gao, Lixin

2009-04-01

451

Photogrammetric Applications of Immersive Video Cameras  

NASA Astrophysics Data System (ADS)

The paper investigates immersive videography and its application in close-range photogrammetry. Immersive video involves the capture of a live-action scene that presents a 360° field of view. It is recorded simultaneously by multiple cameras or microlenses, where the principal point of each camera is offset from the rotating axis of the device. This issue causes problems when stitching together individual frames of video separated from particular cameras, however there are ways to overcome it and applying immersive cameras in photogrammetry provides a new potential. The paper presents two applications of immersive video in photogrammetry. At first, the creation of a low-cost mobile mapping system based on Ladybug®3 and GPS device is discussed. The amount of panoramas is much too high for photogrammetric purposes as the base line between spherical panoramas is around 1 metre. More than 92 000 panoramas were recorded in one Polish region of Czarny Dunajec and the measurements from panoramas enable the user to measure the area of outdoors (adverting structures) and billboards. A new law is being created in order to limit the number of illegal advertising structures in the Polish landscape and immersive video recorded in a short period of time is a candidate for economical and flexible measurements off-site. The second approach is a generation of 3d video-based reconstructions of heritage sites based on immersive video (structure from immersive video). A mobile camera mounted on a tripod dolly was used to record the interior scene and immersive video, separated into thousands of still panoramas, was converted from video into 3d objects using Agisoft Photoscan Professional. The findings from these experiments demonstrated that immersive photogrammetry seems to be a flexible and prompt method of 3d modelling and provides promising features for mobile mapping systems.

Kwiatek, K.; Tokarczyk, R.

2014-05-01

452

Developing a 2.5-D video avatar  

Microsoft Academic Search

Immersive projection technology has become very popular as a virtual reality display system. A 2.5-D video avatar method was proposed and developed. The 2.5-D video avatar was created using a depth map generated by a stereo camera, and it was superimposed on the shared virtual world in real time. A 2.5-D video avatar was also transmitted between two immersive projection

K. Tamagawa; T. Yamada; T. Ogi; M. Hirose

2001-01-01

453

A System for On-demand Video Lectures  

Microsoft Academic Search

Abstract We propose a lecture-on-demand system, which searches lec- ture videos for segments,relevant to user information needs. We utilize the benefits of textbooks and audio\\/video data cor- responding to a single lecture. Our system extracts the au- dio track from a target lecture video, generates a transcrip- tion by large vocabulary continuous speech recognition, and produces,a textual index. Users can

Atsushi Fujii; Yyy Katunobu Itou; Yyy Tetsuya Ishikawa

454

Development of a video-rate stereo machine  

Microsoft Academic Search

A video-rate stereo machine has been developed at CMU with the capability of generating a dense range map, aligned with an intensity image, at the video rate. The target performance of the CMU video-rate stereo machine is: 1) multi-image input of 6 cameras; 2) high throughput of 30 million point×disparity measurement per second; 3) high frame rate of 30 frame\\/sec;

Takeo Kanade; Hiroshi Kano; Shigeru Kimura; Atsushi Yoshida; Kazuo Oda

1995-01-01

455

STEM Careers Phone Video Chat  

NSDL National Science Digital Library

This brief video from WPSU compares technologies from yesterday with today. Yesterday a middle school girl phones her mom while today a girl the same age video chats. The video suggests that science will bring us technologies of tomorrow.

Wpsu

2009-11-10

456

Video: Infared Spectroscopy  

NSDL National Science Digital Library

This video, provided by the Royal Society of Chemistry and hosted on YouTube, covers the basic principles of infrared spectroscopy. The material would be very useful in describing the concepts to students for the first time. Running time for the video is 6:32.

2011-06-02

457

Wii Remote Video  

NSDL National Science Digital Library

A great video demonstrating the use of a Nintendo Wii remote for classroom purposes. Johnny Lee demonstrates his amazing Wii Remote hacks, which transform the $40 game piece into a digital whiteboard, a touchscreen and a head-mounted 3-D viewer. This video presents not only applicable technology to the classroom, but it also shows aspects of innovative engineering.

2008-11-17