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Sample records for itunes live streaming

  1. Anleitung zum Live Streaming Vorbereitung

    E-print Network

    Arnold, Anton

    Anleitung zum Live Streaming Vorbereitung Legen Sie in Ihrem TUWEL Kurs eine Aktivität ,,RSSPlayer,EI8,EI9,EI10,Radinger [!] Achtung: Audimax sowie Treitler (nur ,,HQ") Sender-Hörsaal: Streaming dem per E-Mail zugesendeten Passwort an und starten Sie die Streaming Software ,,Lecturetube Live

  2. ATLAS Live: Collaborative Information Streams

    NASA Astrophysics Data System (ADS)

    Goldfarb, Steven; ATLAS Collaboration

    2011-12-01

    I report on a pilot project launched in 2010 focusing on facilitating communication and information exchange within the ATLAS Collaboration, through the combination of digital signage software and webcasting. The project, called ATLAS Live, implements video streams of information, ranging from detailed detector and data status to educational and outreach material. The content, including text, images, video and audio, is collected, visualised and scheduled using digital signage software. The system is robust and flexible, utilizing scripts to input data from remote sources, such as the CERN Document Server, Indico, or any available URL, and to integrate these sources into professional-quality streams, including text scrolling, transition effects, inter and intra-screen divisibility. Information is published via the encoding and webcasting of standard video streams, viewable on all common platforms, using a web browser or other common video tool. Authorisation is enforced at the level of the streaming and at the web portals, using the CERN SSO system.

  3. itunes University and ARL Academic Libraries

    ERIC Educational Resources Information Center

    Thornton, Elaine

    2009-01-01

    iTunes University is a free service offered by Apple iTunes to educational institutions. It serves as a platform for the management and distribution of educational, instructional, and informational resources through both audio and video podcasts. Participation in the service among colleges and universities continues to grow since its official

  4. Tipps & Tricks zum Live Streaming 1. Bei einem Live Stream mit Lecturetube Live knnen entweder die Inhalte des Vortragenden-Rechners (z.B.: auf

    E-print Network

    Arnold, Anton

    Tipps & Tricks zum Live Streaming 1. Bei einem Live Stream mit Lecturetube Live können entweder die Dokumentenkamera ersetzen Einbindung von Experimenten in den Live Stream ?bertragung der Vortragenden 2. Wiederholen Sie die Fragen aus dem Publikum, damit auch Studierende, die den Stream mitverfolgen, diese hören

  5. Diagnosing Network-wide P2P Live Streaming Inefficiencies

    E-print Network

    Li, Baochun

    Diagnosing Network-wide P2P Live Streaming Inefficiencies Chuan Wu Baochun Li Shuqiao Zhao@uusee.com Abstract--Large-scale live peer-to-peer (P2P) streaming ap- plications have been successfully deployed of programming, there still commonly exist channels and times where and when the streaming quality

  6. Using Temporal Semantics for Live Media Stream Queries

    E-print Network

    Gupta, Amarnath

    Using Temporal Semantics for Live Media Stream Queries Bin Liu1 , Amarnath Gupta2 and Ramesh Jain3 live media streams is a challenging problem that becomes an essential requirement in a growing number of applications. We address the problem of evaluating continuous queries on media streams produced by media

  7. EMS: Encoded Multipath Streaming for Real-time Live Streaming Applications

    E-print Network

    Kim, Minkyong

    of these multipath streaming schemes (e.g., [1], [2], [3], [4], [6]) also apply Forward Error Correction (FECEMS: Encoded Multipath Streaming for Real-time Live Streaming Applications Alix L.H. Chow1, Hao, xia.52@osu.edu3, zhnliu@yahoo.com4 Abstract--Multipath streaming protocols have recently at- tracted

  8. Supporting Seamless Mobility for P2P Live Streaming

    PubMed Central

    Kim, Eunsam; Kim, Sangjin; Lee, Choonhwa

    2014-01-01

    With advent of various mobile devices with powerful networking and computing capabilities, the users' demand to enjoy live video streaming services such as IPTV with mobile devices has been increasing rapidly. However, it is challenging to get over the degradation of service quality due to data loss caused by the handover. Although many handover schemes were proposed at protocol layers below the application layer, they inherently suffer from data loss while the network is being disconnected during the handover. We therefore propose an efficient application-layer handover scheme to support seamless mobility for P2P live streaming. By simulation experiments, we show that the P2P live streaming system with our proposed handover scheme can improve the playback continuity significantly compared to that without our scheme. PMID:24977171

  9. Flash Crowd in P2P Live Streaming Systems: Fundamental Characteristics and

    E-print Network

    Li, Baochun

    , Senior Member, IEEE, and Xiaofei Liao, Member, IEEE Abstract--Peer-to-peer (P2P) live video streaming broadcast. Such a severe flash crowd phenomenon in live streaming poses significant challenges in the system the requirement of otherwise costly server deployment. Index Terms--Live video streaming, peer-to-peer, flash

  10. Texas Tech on iTunes U Policy Guidelines DISCLAIMER AND ATTESTATION

    E-print Network

    Rock, Chris

    Texas Tech on iTunes U Policy Guidelines DISCLAIMER AND ATTESTATION: Statements and opinions reflected in the content within Texas Tech on iTunes U are those of the copyright owner (audio and/or video file,) and not necessarily those of Texas Tech University. All content submitted to Texas Tech on i

  11. CONTROLLING ACOUSTIC STREAMING IN A MULTI-WELL MICROPLATE FOR IMPROVING LIVE CELL ASSAYS

    E-print Network

    CONTROLLING ACOUSTIC STREAMING IN A MULTI-WELL MICROPLATE FOR IMPROVING LIVE CELL ASSAYS M. Ohlin of Technology, SWEDEN ABSTRACT Acoustic streaming in a multi-well microplate is investigated using two different ultrasonic actuation frequency-schemes: Single-frequency and frequency-modulation. The streaming is tracked

  12. LocalTree: An Efficient Algorithm for Mobile Peer-to-Peer Live Streaming

    E-print Network

    Chan, Shueng-Han Gary

    similar to unstructured algorithm if the network is dynamic. I. Introduction In traditional live video video broadcasting in a mobile network. We consider the realistic scenario that connections between approach to provide live video streaming. In mobile P2P streaming, mobile devices relay their received

  13. The performance of locality-aware topologies for peer-to-peer live streaming

    E-print Network

    Clegg, Richard G.

    peers on the network. Metrics are defined which assess the topologies in terms of delay, bandwidth usageThe performance of locality-aware topologies for peer-to-peer live streaming Richard G. Clegg with the effect of overlay network topology on the performance of live streaming peer-to-peer systems. The paper

  14. The performance of locality-aware topologies for peer-to-peer live streaming

    E-print Network

    Clegg, Richard G.

    are defined which assess the topologies in terms of delay, bandwidth usage and resilience to peer dropThe performance of locality-aware topologies for peer-to-peer live streaming R. G. Clegg (richard topology on the performance of live streaming peer-to-peer systems. The paper focuses on the evaluation

  15. Evaluating P2P Live Streaming Systems: the CNG Case Shakeel Ahmad1

    E-print Network

    the video of the game from the screen and sends it to a central server which broadcasts it live. However have been proposed for the provision of scalable live video streaming services over the Internet. While to be cost effective and easy to deploy. We identify the main issues in the evalua- tion of P2P live video

  16. Live Video Streaming for Community Networks, Experimenting with PeerStreamer on the Ninux Community

    E-print Network

    Lo Cigno, Renato Antonio

    Live Video Streaming for Community Networks, Experimenting with PeerStreamer on the Ninux Community, five video conference servers and nine radio broadcasting servers. CNs are mesh networks with symmet video streaming could be a distinguishing feature of Community Networks, due to the affinity to both

  17. DejaVu: Declarative Pattern Matching over Live and Archived Streams of Events

    E-print Network

    DejaVu: Declarative Pattern Matching over Live and Archived Streams of Events Nihal Dindar, Bari@inf.ethz.ch ABSTRACT DejaVu is an event processing system that integrates declarative pattern matching over live- pects of the DejaVu query language and architecture using two dif- ferent application scenarios, namely

  18. Adaptive live multicast video streaming of SVC with UEP FEC

    NASA Astrophysics Data System (ADS)

    Lev, Avram; Lasry, Amir; Loants, Maoz; Hadar, Ofer

    2014-09-01

    Ideally, video streaming systems should provide the best quality video a user's device can handle without compromising on downloading speed. In this article, an improved video transmission system is presented which dynamically enhances the video quality based on a user's current network state and repairs errors from data lost in the video transmission. The system incorporates three main components: Scalable Video Coding (SVC) with three layers, multicast based on Receiver Layered Multicast (RLM) and an UnEqual Forward Error Correction (FEC) algorithm. The SVC provides an efficient method for providing different levels of video quality, stored as enhancement layers. In the presented system, a proportional-integral-derivative (PID) controller was implemented to dynamically adjust the video quality, adding or subtracting quality layers as appropriate. In addition, an FEC algorithm was added to compensate for data lost in transmission. A two dimensional FEC was used. The FEC algorithm came from the Pro MPEG code of practice #3 release 2. Several bit errors scenarios were tested (step function, cosine wave) with different bandwidth size and error values were simulated. The suggested scheme which includes SVC video encoding with 3 layers over IP Multicast with Unequal FEC algorithm was investigated under different channel conditions, variable bandwidths and different bit error rates. The results indicate improvement of the video quality in terms of PSNR over previous transmission schemes.

  19. Using Text Mining to Uncover Students' Technology-Related Problems in Live Video Streaming

    ERIC Educational Resources Information Center

    Abdous, M'hammed; He, Wu

    2011-01-01

    Because of their capacity to sift through large amounts of data, text mining and data mining are enabling higher education institutions to reveal valuable patterns in students' learning behaviours without having to resort to traditional survey methods. In an effort to uncover live video streaming (LVS) students' technology related-problems and to

  20. Wireless live streaming video of laparoscopic surgery: a bandwidth analysis for handheld computers.

    PubMed

    Gandsas, Alex; McIntire, Katherine; George, Ivan M; Witzke, Wayne; Hoskins, James D; Park, Adrian

    2002-01-01

    Over the last six years, streaming media has emerged as a powerful tool for delivering multimedia content over networks. Concurrently, wireless technology has evolved, freeing users from desktop boundaries and wired infrastructures. At the University of Kentucky Medical Center, we have integrated these technologies to develop a system that can wirelessly transmit live surgery from the operating room to a handheld computer. This study establishes the feasibility of using our system to view surgeries and describes the effect of bandwidth on image quality. A live laparoscopic ventral hernia repair was transmitted to a single handheld computer using five encoding speeds at a constant frame rate, and the quality of the resulting streaming images was evaluated. No video images were rendered when video data were encoded at 28.8 kilobytes per second (Kbps), the slowest encoding bitrate studied. The highest quality images were rendered at encoding speeds greater than or equal to 150 Kbps. Of note, a 15 second transmission delay was experienced using all four encoding schemes that rendered video images. We believe that the wireless transmission of streaming video to handheld computers has tremendous potential to enhance surgical education. For medical students and residents, the ability to view live surgeries, lectures, courses and seminars on handheld computers means a larger number of learning opportunities. In addition, we envision that wireless enabled devices may be used to telemonitor surgical procedures. However, bandwidth availability and streaming delay are major issues that must be addressed before wireless telementoring becomes a reality. PMID:15458077

  1. Promoting the Library's CD Collection via iTunes File Sharing

    ERIC Educational Resources Information Center

    Connolly, Bruce

    2005-01-01

    One of the hippest things staff can do with technology, is to use it to meet students on their own turf. As part of an outreach effort, one group of librarians at Union College's Schaffer Library (Schenectady, NY) started sharing its vast CD collection via iTunes. They were trying to show college students that there was a lot to discover at the

  2. Scheduling Algorithm used in Live Media Streaming Based on Data-drive Overlay Network

    NASA Astrophysics Data System (ADS)

    Na, Xu; Shuang, Sun

    To improve the playback quality of P2P media streaming system terminal nodes and enhances the overall performance, a data scheduling algorithm(LDSA) is proposed, it is able to dynamically adjust the pending request according to the node ability. The algorithm in satisfies the media streaming living in the time response foundation, had considered how to minimize the waiting time for the requests in the node and the rapid distribution in network of scarce data blocks. Through compares with the existing scheduling algorithm, the experimental results are proved that the MDSA algorithm have the prominent performance in diminishing the accumulated latency and enhancing the media broadcast quality

  3. Efficient Analysis of Live and Historical Streaming Data and itsApplication to Cybersecurity

    SciTech Connect

    Reiss, Frederick; Stockinger, Kurt; Wu, Kesheng; Shoshani, Arie; Hellerstein, Joseph M.

    2007-04-06

    Applications that query data streams in order to identifytrends, patterns, or anomalies can often benefit from comparing the livestream data with archived historical stream data. However, searching thishistorical data in real time has been considered so far to beprohibitively expensive. One of the main bottlenecks is the update costsof the indices over the archived data. In this paper, we address thisproblem by using our highly-efficient bitmap indexing technology (calledFastBit) and demonstrate that the index update operations aresufficiently efficient for this bottleneck to be removed. We describe ourprototype system based on the TelegraphCQ streaming query processor andthe FastBit bitmap index. We present a detailed performance evaluation ofour system using a complex query workload for analyzing real networktraffic data. The combined system uses TelegraphCQ to analyze streams oftraffic information and FastBit to correlate current behaviors withhistorical trends. We demonstrate that our system can simultaneouslyanalyze (1) live streams with high data rates and (2) a large repositoryof historical stream data.

  4. Two Dimensional Array Based Overlay Network for Balancing Load of Peer-to-Peer Live Video Streaming

    NASA Astrophysics Data System (ADS)

    Faruq Ibn Ibrahimy, Abdullah; Rafiqul, Islam Md; Anwar, Farhat; Ibn Ibrahimy, Muhammad

    2013-12-01

    The live video data is streaming usually in a tree-based overlay network or in a mesh-based overlay network. In case of departure of a peer with additional upload bandwidth, the overlay network becomes very vulnerable to churn. In this paper, a two dimensional array-based overlay network is proposed for streaming the live video stream data. As there is always a peer or a live video streaming server to upload the live video stream data, so the overlay network is very stable and very robust to churn. Peers are placed according to their upload and download bandwidth, which enhances the balance of load and performance. The overlay network utilizes the additional upload bandwidth of peers to minimize chunk delivery delay and to maximize balance of load. The procedure, which is used for distributing the additional upload bandwidth of the peers, distributes the additional upload bandwidth to the heterogeneous strength peers in a fair treat distribution approach and to the homogeneous strength peers in a uniform distribution approach. The proposed overlay network has been simulated by Qualnet from Scalable Network Technologies and results are presented in this paper.

  5. PROCEEDINGS OF THE IEEE 1 A Transport Layer for Live Streaming in a Content

    E-print Network

    Kleinberg, Robert D.

    , 02139 Cambridge, MA, 02139 Abstract-- Streaming media on the internet has experienced rapid growth over communications media, internet streaming will become a significant component of many content providers that have to be addressed in a successful streaming media offering. Streaming Content Delivery Networks

  6. PATTERN-PUSH: A LOW-DELAY MESH-PUSH SCHEDULING FOR LIVE PEER-TO-PEER STREAMING

    E-print Network

    Chan, Shueng-Han Gary

    , CA 95134 USA ABSTRACT In live peer-to-peer (P2P) streaming, each peer (child) has a num- ber at the child. It is chal- lenging to develop a scheduling algorithm that achieves low delay given heterogeneous by a starting packet ID and a cycle bitmap. Pattern-push requires only minimal feedback from the child

  7. Poster: DejaVu A Complex Event Processing System for Pattern Matching over Live and Historical Data Streams

    E-print Network

    pattern match- ing over live and archived streams of events [4]. We have built DejaVu on top of the MySQL relational database system [1]. As such, we follow the basic architecture of MySQL, while making newVu. One of the key ar- chitectural features of MySQL that we exploit in our design is its pluggable

  8. Biology in focus: better lives through better science: new hope for acid streams

    USGS Publications Warehouse

    Watten, Barnaby

    1998-01-01

    Across the nation, a toxic pollutant turns clean streams orange, kills fish and plant life, and smells like rotten eggs. The culprit is acid mine drainage, the poisonous water leaking from more than 500,000 abandoned and inactive mines in 32 states. The toxic discharge is a problem for operational mines as well. In the Appalachian coal region, for example, acid mine drainage has degraded more than 8,000 miles of streams and has left some aquatic habitats virtually lifeless.

  9. Application and Integration of Live Streaming from Leading Robotic Centres Can Enhance Surgical Education.

    PubMed

    Collins, Justin W; Verhagen, Harko; Mottrie, Alexander; Wiklund, Peter N

    2015-11-01

    Internet-based video-streaming enables us to share surgical knowledge and to study leading surgeons while they operate in their home institutions, and is widely accessible to trainees. Planned developments include enriched learning experiences with improved user friendliness, interactivity, and real-time feedback. PMID:26259999

  10. New streams of religion: fly fishing as a lived, religion of nature.

    PubMed

    Snyder, Samuel

    2007-01-01

    Fly fishers around the world frequently use terms such as religious, spiritual, sacred, divine, ritual, meditation, and conversion to describe their personal angling experiences. Further, drawing upon religious terminology, anglers will refer to rivers as their church and to nature as sacred. Often these latter pronouncements drive a concern for the conservation of these sacred spaces as evidenced by participation in both local and national conservation organizations. Informed by theoretical perspectives offered by religious studies, particularly "lived religion" and "religion and nature," I shall trace a few of the historical, material, and everyday elements of fly fishers and their subcultures, demonstrating along the way the insights that come by understanding fly fishing as a religious practice, which can, at times, drive an ethic of environmental conservation. PMID:20681092

  11. Learner Outcomes and Satisfaction: A Comparison of Live Video-Streamed Instruction, Satellite Broadcast Instruction, and Face-to-Face Instruction

    ERIC Educational Resources Information Center

    Abdous, M'hammed; Yoshimura, Miki

    2010-01-01

    This study examined the final grade and satisfaction level differences among students taking specific courses using three different methods: face-to-face in class, via satellite broadcasting at remote sites, and via live video-streaming at home or at work. In each case, the same course was taught by the same instructor in all three delivery

  12. iTunes song-gifting is a low-cost, efficient recruitment tool to engage high-risk MSM in internet research.

    PubMed

    Holland, Christine M; Ritchie, Natalie D; Du Bois, Steve N

    2015-10-01

    This brief report describes methodology and results of a novel, efficient, and low-cost recruitment tool to engage high-risk MSM in online research. We developed an incentivization protocol using iTunes song-gifting to encourage participation of high-risk MSM in an Internet-based survey of HIV status, childhood sexual abuse, and adult behavior and functioning. Our recruitment methodology yielded 489 participants in 4.5months at a total incentive cost of $1.43USD per participant. The sample comprised a critically high-risk group of MSM, including 71.0% who reported recent condomless anal intercourse. We offer a "how-to" guide to aid future investigators in using iTunes song-gifting incentives. PMID:26174208

  13. MATIN: a random network coding based framework for high quality peer-to-peer live video streaming.

    PubMed

    Barekatain, Behrang; Khezrimotlagh, Dariush; Aizaini Maarof, Mohd; Ghaeini, Hamid Reza; Salleh, Shaharuddin; Quintana, Alfonso Ariza; Akbari, Behzad; Cabrera, Alicia Trivio

    2013-01-01

    In recent years, Random Network Coding (RNC) has emerged as a promising solution for efficient Peer-to-Peer (P2P) video multicasting over the Internet. This probably refers to this fact that RNC noticeably increases the error resiliency and throughput of the network. However, high transmission overhead arising from sending large coefficients vector as header has been the most important challenge of the RNC. Moreover, due to employing the Gauss-Jordan elimination method, considerable computational complexity can be imposed on peers in decoding the encoded blocks and checking linear dependency among the coefficients vectors. In order to address these challenges, this study introduces MATIN which is a random network coding based framework for efficient P2P video streaming. The MATIN includes a novel coefficients matrix generation method so that there is no linear dependency in the generated coefficients matrix. Using the proposed framework, each peer encapsulates one instead of n coefficients entries into the generated encoded packet which results in very low transmission overhead. It is also possible to obtain the inverted coefficients matrix using a bit number of simple arithmetic operations. In this regard, peers sustain very low computational complexities. As a result, the MATIN permits random network coding to be more efficient in P2P video streaming systems. The results obtained from simulation using OMNET++ show that it substantially outperforms the RNC which uses the Gauss-Jordan elimination method by providing better video quality on peers in terms of the four important performance metrics including video distortion, dependency distortion, End-to-End delay and Initial Startup delay. PMID:23940530

  14. MATIN: A Random Network Coding Based Framework for High Quality Peer-to-Peer Live Video Streaming

    PubMed Central

    Barekatain, Behrang; Khezrimotlagh, Dariush; Aizaini Maarof, Mohd; Ghaeini, Hamid Reza; Salleh, Shaharuddin; Quintana, Alfonso Ariza; Akbari, Behzad; Cabrera, Alicia Trivio

    2013-01-01

    In recent years, Random Network Coding (RNC) has emerged as a promising solution for efficient Peer-to-Peer (P2P) video multicasting over the Internet. This probably refers to this fact that RNC noticeably increases the error resiliency and throughput of the network. However, high transmission overhead arising from sending large coefficients vector as header has been the most important challenge of the RNC. Moreover, due to employing the Gauss-Jordan elimination method, considerable computational complexity can be imposed on peers in decoding the encoded blocks and checking linear dependency among the coefficients vectors. In order to address these challenges, this study introduces MATIN which is a random network coding based framework for efficient P2P video streaming. The MATIN includes a novel coefficients matrix generation method so that there is no linear dependency in the generated coefficients matrix. Using the proposed framework, each peer encapsulates one instead of n coefficients entries into the generated encoded packet which results in very low transmission overhead. It is also possible to obtain the inverted coefficients matrix using a bit number of simple arithmetic operations. In this regard, peers sustain very low computational complexities. As a result, the MATIN permits random network coding to be more efficient in P2P video streaming systems. The results obtained from simulation using OMNET++ show that it substantially outperforms the RNC which uses the Gauss-Jordan elimination method by providing better video quality on peers in terms of the four important performance metrics including video distortion, dependency distortion, End-to-End delay and Initial Startup delay. PMID:23940530

  15. Developing solutions for sustainable living- the Urban Living Laboratory: The world's largest 'living laboratory' for research on green living

    E-print Network

    Smith, Courtney

    2011-01-01

    stream_source_info Developing solutions for sustainable living.pdf.txt stream_content_type text/plain stream_size 8970 Content-Encoding ISO-8859-1 stream_name Developing solutions for sustainable living.pdf.txt Content-Type text... ?ve Leadership in Energy and Environmental Design, or LEED-certi?ed building types including multifamily housing, o?ce Developing solutions for sustainable living? the Urban Living Laboratory and retail space, two hotels, and a visitors center...

  16. Capacity Allocation Games for Network-Coded Multicast Streaming

    E-print Network

    Anshelevich, Elliot

    of these involve live video streaming, while others stream video that is already available in stored format but too to boost live video streaming through the Internet in the coming years [3]. Streaming stored video may (broadcast), receiver-driven video streaming (like video streaming from YouTube [4]) will typically

  17. Live, Learn and Thrive

    E-print Network

    Supercinski, Danielle

    2005-01-01

    stream_source_info Live, Learn and Thrive.pdf.txt stream_content_type text/plain stream_size 2898 Content-Encoding ISO-8859-1 stream_name Live, Learn and Thrive.pdf.txt Content-Type text/plain; charset=ISO-8859-1 Live..., Learn and Thrive RGBI team award presented at NMSU ceremony by Danielle Supercinski Rio Grande Basin Initiative (RGBI) participants received the Team Award from New Mexico State University (NMSU) on April 21, 2005, during the NMSU Live, Learn...

  18. Streaming an der Universitt Wien Mediendidaktische Beratung

    E-print Network

    Ascensi, Gerard

    Streaming an der Universität Wien u:stream Mediendidaktische Beratung Am Center for Teaching-1-4277-120 60 ctl@univie.ac.at ctl.univie.ac.at Support u:stream Der Support u:stream des Zentralen Vorbereitung, Durchführung und Veröffentlichung der Aufzeichnungen bzw. Live-Streams + Nachbearbeitungen

  19. Time-Shifted Streaming in a Tree-Based Peer-to-Peer System

    E-print Network

    Girod, Bernd

    Time-Shifted Streaming in a Tree-Based Peer-to-Peer System Jeonghun Noh ASSIA inc., Redwood City-to-peer (P2P) streaming sys- tem that multicasts live video as well as provides the live video as Video a live video stream, and to view video that was streamed before the particular user joined the session

  20. Mountain Stream

    E-print Network

    Unknown

    2011-09-05

    This dissertation is composed of three parts of contributions. Systems of a fully penetrating pumping well in a confined aquifer near a fully penetrating stream with and without streambeds are discussed in Chapter II. In Chapter III, stream...

  1. Delay Bounds of Peer-to-Peer Video Streaming Electrical & Computer Engineering Department

    E-print Network

    Liu, Yong

    Delay Bounds of Peer-to-Peer Video Streaming Yong Liu Electrical & Computer Engineering Department bounds for P2P live streaming systems. We show that the bandwidth heterogeneity among peers can-ball streaming algorithm to approach the minimum delay bound in P2P live video streaming. Our analysis

  2. Value Stream Mapping Value Stream Mapping VSM

    E-print Network

    Laksanacharoen, Sathaporn

    Value Stream Mapping (VSM)(VSM) #12;Value Stream Mapping VSM 1 Value Stream Mapping VSM 1 Value Stream Current State Map As-Is State / - Process owner - Process owner #12) #12;Value Stream MappingValue Stream Mapping End to End Patient Flow Register OPD/ER Admit Dischargeg

  3. Language design for distributed stream processing

    E-print Network

    Newton, Ryan Rhodes, 1980-

    2009-01-01

    Applications that combine live data streams with embedded, parallel, and distributed processing are becoming more commonplace. WaveScript is a domain-specific language that brings high-level, type-safe, garbage-collected ...

  4. Streams of Content, Limited Attention: The Flow of Information through Social Media

    ERIC Educational Resources Information Center

    Boyd, Danah

    2010-01-01

    The future of Web 2.0 is about content streams or streams of information. The metaphor implied by "streams" is powerful. The idea is that individuals are living inside the stream: adding to it, consuming it, redirecting it. The goal today is to be attentively aligned--"in flow"--with these information streams, to be aware of information as it

  5. Stored Media Streaming in BitTorrent-like P2P Networks Kyung Wook Hwang

    E-print Network

    Stored Media Streaming in BitTorrent-like P2P Networks Kyung Wook Hwang , Vishal Misra , and Dan and wait for the piece to be downloaded. For media streaming which pro- vides real-time playback, there are generally two different kinds: live media streaming and stored media streaming [25]. A network such as CoolStreaming

  6. DagStream: Locality Aware and Failure Resilient Peer-to-Peer Streaming

    E-print Network

    Nahrstedt, Klara

    become a promising approach to broadcasting non-interactive live media from one source to a large number amount of bandwidth from the broadcasting servers. Designing a live P2P streaming system, however, faces Nahrstedt University of Illinois at Urbana-Champaign {jinliang, klara}@cs.uiuc.edu ABSTRACT Live peer

  7. Cellular Subcompartments through Cytoplasmic Streaming.

    PubMed

    Pieuchot, Laurent; Lai, Julian; Loh, Rachel Ann; Leong, Fong Yew; Chiam, Keng-Hwee; Stajich, Jason; Jedd, Gregory

    2015-08-24

    Cytoplasmic streaming occurs in diverse cell types, where it generally serves a transport function. Here, we examine streaming in multicellular fungal hyphae and identify an additional function wherein regimented streaming forms distinct cytoplasmic subcompartments. In the hypha, cytoplasm flows directionally from cell to cell through septal pores. Using live-cell imaging and computer simulations, we identify a flow pattern that produces vortices (eddies) on the upstream side of the septum. Nuclei can be immobilized in these microfluidic eddies, where they form multinucleate aggregates and accumulate foci of the HDA-2 histone deacetylase-associated factor, SPA-19. Pores experiencing flow degenerate in the absence of SPA-19, suggesting that eddy-trapped nuclei function to reinforce the septum. Together, our data show that eddies comprise a subcellular niche favoring nuclear differentiation and that subcompartments can be self-organized as a consequence of regimented cytoplasmic streaming. PMID:26305593

  8. Stream Studies.

    ERIC Educational Resources Information Center

    Hamilton City Board of Education (Ontario).

    This manual provides teachers with some knowledge of ecological study methods and techniques used in collecting data when plants and animals are studied in the field. Most activities deal with the interrelatedness of plant and animal life to the structure and characteristics of a stream and pond. Also included in this unit plan designed for the

  9. Improving the Fault Resilience of Overlay Multicast for Media Streaming

    E-print Network

    Jarvis, Stephen

    Improving the Fault Resilience of Overlay Multicast for Media Streaming Guang Tan, Student Member in the context of live media streaming by exploring 1) how to construct a stable multicast tree that minimizes, multicast, media streaming, peer-to-peer, overlay. 1 INTRODUCTION OVERLAY multicast [7] (or application

  10. Multimedia Streaming via TCP: An Analytic Performance Study

    E-print Network

    Massachusetts at Amherst, University of

    TOWSLEY University of Massachusetts, Amherst TCP is widely used in commercial media streaming systems, with recent measurement stud- ies indicating that a significant fraction of Internet streaming media to system- atically investigate the performance of TCP for both live and stored-media streaming. We validate

  11. ISS Live!

    NASA Technical Reports Server (NTRS)

    Price, Jennifer; Harris, Philip; Hochstetler, Bruce; Guerra, Mark; Mendez, Israel; Healy, Matthew; Khan, Ahmed

    2013-01-01

    International Space Station Live! (ISSLive!) is a Web application that uses a proprietary commercial technology called Lightstreamer to push data across the Internet using the standard http port (port 80). ISSLive! uses the push technology to display real-time telemetry and mission timeline data from the space station in any common Web browser or Internet- enabled mobile device. ISSLive! is designed to fill a unique niche in the education and outreach areas by providing access to real-time space station data without a physical presence in the mission control center. The technology conforms to Internet standards, supports the throughput needed for real-time space station data, and is flexible enough to work on a large number of Internet-enabled devices. ISSLive! consists of two custom components: (1) a series of data adapters that resides server-side in the mission control center at Johnson Space Center, and (2) a set of public html that renders the data pushed from the data adapters. A third component, the Lightstreamer server, is commercially available from a third party and acts as an intermediary between custom components (1) and (2). Lightstreamer also provides proprietary software libraries that are required to use the custom components. At the time of this reporting, this is the first usage of Web-based, push streaming technology in the aerospace industry.

  12. Improving the Fault Resilience of Overlay Multicast for Media Streaming Guang Tan, Stephen A. Jarvis and Daniel P. Spooner

    E-print Network

    Jarvis, Stephen

    Improving the Fault Resilience of Overlay Multicast for Media Streaming Guang Tan, Stephen A resilience of overlay-based live media streaming from two aspects: (1) how to construct a stable multicast. This paper considers this issue in the context of live media streaming, where the data is streamed from

  13. ForPeerReview Dynamic Bandwidth Auctions in Multi-overlay P2P Streaming with

    E-print Network

    Li, Baochun

    based media distribution to achieve efficient multi-overlay streaming. Since such strategies of conflict with network coding based media dissemination, these streaming overlays adapt to peer dynamics, fairly share with a modern codec such as H.264, each overlay distributes a live media stream with a specific streaming rate

  14. Assisted Living

    MedlinePLUS

    ... but they don't need full-time nursing care. Some assisted living facilities are part of retirement ... change. Assisted living costs less than nursing home care. It is still fairly expensive. Older people or ...

  15. Mining Sensor Streams for Discovering Human Activity Patterns Over Time

    E-print Network

    Cook, Diane J.

    Mining Sensor Streams for Discovering Human Activity Patterns Over Time Submitted for Blind Review assisted living to security and surveillance. Most of the current approaches for activity discovery apartments. Index Terms--Activity Data Mining; Smart Environments; Sensor Data; Stream Sequence Mining; I

  16. Optimal Patching Schemes for Efficient Multimedia Streaming 1

    E-print Network

    Rexford, Jennifer

    stream ing video as an integral component. Examples of such appli cations include live video broadcasts video technology has led to the emergence of sev eral networked multimedia applications which include video streams, the server and network resources can be significantly reduced by allowing multiple

  17. Adjusting Forward Error Correction for TCP-Friendly Streaming MPEG

    E-print Network

    Claypool, Mark

    of news broadcasts, music television and live sporting events. Users can access these streaming video) and Forward Error Correction (FEC) that are part of the MPEG video transmission. Assuming a network esti- mate associated with window- based network protocols. For these reasons, stream- ing video applications often use

  18. Delivering Instruction via Streaming Media: A Higher Education Perspective.

    ERIC Educational Resources Information Center

    Mortensen, Mark; Schlieve, Paul; Young, Jon

    2000-01-01

    Describes streaming media, an audio/video presentation that is delivered across a network so that it is viewed while being downloaded onto the user's computer, including a continuous stream of video that can be pre-recorded or live. Discusses its use for nontraditional students in higher education and reports on implementation experiences. (LRW)

  19. The Impact of Playout Policy on the Performance of P2P Live . . . or how not to kill your P2P advantage

    E-print Network

    Stavrakakis, Ioannis

    The Impact of Playout Policy on the Performance of P2P Live Streaming . . . or how not to kill your on the performance of P2P live streaming systems. We argue and demonstrate experimentally that (popular) playout the performance of P2P live streaming. Consequently, we argue in favor of keeping different playout points "near

  20. Regex-Stream

    Energy Science and Technology Software Center (ESTSC)

    2012-09-01

    Log files are typically semi-or un-structured. To be useable, they need to be parsed into a standard, structured format. Regex-Stream facilitates parsing text files into structured data (JSON) in streams of data.

  1. Prioritized Contact Transport Stream

    NASA Technical Reports Server (NTRS)

    Hunt, Walter Lee, Jr. (Inventor)

    2015-01-01

    A detection process, contact recognition process, classification process, and identification process are applied to raw sensor data to produce an identified contact record set containing one or more identified contact records. A prioritization process is applied to the identified contact record set to assign a contact priority to each contact record in the identified contact record set. Data are removed from the contact records in the identified contact record set based on the contact priorities assigned to those contact records. A first contact stream is produced from the resulting contact records. The first contact stream is streamed in a contact transport stream. The contact transport stream may include and stream additional contact streams. The contact transport stream may be varied dynamically over time based on parameters such as available bandwidth, contact priority, presence/absence of contacts, system state, and configuration parameters.

  2. Scalable Video Streaming with Helper Nodes using Random Linear Network Coding

    E-print Network

    Wu, Jie

    1 Scalable Video Streaming with Helper Nodes using Random Linear Network Coding Pouya Ostovari our method can be extended to the case of wireless live streaming, in which a set of videos Abstract--Video streaming generates a substantial fraction of the traffic on the Internet. The demands

  3. Dynamic Bandwidth Auctions in Multi-overlay P2P Streaming with Network Coding

    E-print Network

    Li, Zongpeng

    1 Dynamic Bandwidth Auctions in Multi-overlay P2P Streaming with Network Coding Chuan Wu, Student, bli}@eecg.toronto.edu {zongpeng}@cpsc.ucalgary.ca Abstract--In peer-to-peer (P2P) live streaming applications such as IPTV, it is natural to accommodate multiple coexisting streaming overlays, corresponding

  4. Minimizing Node Churn in Peer-to-Peer Streaming Constantinos Vassilakis

    E-print Network

    Stavrakakis, Ioannis

    Minimizing Node Churn in Peer-to-Peer Streaming Constantinos Vassilakis Greek Research & Technology and Kapodistrian University of Athens, Greece Abstract Several Peer to Peer (P2P) streaming systems have proved by now their ability to deliver live video streams to hundreds of users. However the inherent instability

  5. Real-Time Joint Rate and Protection Allocation for Multi-User Scalable Video Streaming

    E-print Network

    Mansour, Hassan

    Real-Time Joint Rate and Protection Allocation for Multi-User Scalable Video Streaming Hassan for multiple scalable video streams sharing a single downlink channel. High speed downlink packet access (HSDPA) systems allow for multiple live video streams to share a common downlink channel among multiple mobile

  6. Auction Based On-Demand P2P Min-Cost Media Streaming with Network Coding

    E-print Network

    Li, Zongpeng

    1 Auction Based On-Demand P2P Min-Cost Media Streaming with Network Coding Xiaowen Chu , Kaiyong, Indian Institute of Technology, Delhi Abstract Realizing on-demand media streaming in a Peer-to-Peer (P2P) fashion is more challenging than in the case of live media streaming, since only peers with close-by media

  7. Streaming Video Traffic : Characterization and Network Impact Jacobus van der Merwe, Subhabrata Sen, Charles Kalmanek

    E-print Network

    van der Merwe, Kobus

    such as live video broadcasts, distance education, corporate telecasts, etc. It is therefore importantStreaming Video Traffic : Characterization and Network Impact Jacobus van der Merwe, Subhabrata Sen technology have led to the rise of several net- worked streaming media applications such as live video

  8. Experimental Stream Segment

    USGS Multimedia Gallery

    One of six experimental stream segments used to study the dispersal of free embryo sturgeon at the Columbia Environmental Research Center. The stream segment is 5 meters long and 0.5 meters wide, and is filled with cobble-sized rock to a depth of 12 centimeters. Streams are covered durin...

  9. Living Laboratories

    ERIC Educational Resources Information Center

    Mules, B. R.

    1976-01-01

    Presented is a review of various methods of keeping live animals, including scorpions, spiders, crabs, crayfish, shrimp, ants, fish, mice, and birds, as well as plants as a school science project/display. (SL)

  10. Assisted Living

    MedlinePLUS

    ... Recreational activities Security Transportation How to Choose a Facility A good match between a facility and a resident's needs depends as much on the philosophy and services of the assisted living facility as it does on the quality of care. ...

  11. Healthy Living

    MedlinePLUS

    ... changes to your lifestyle. By taking steps toward healthy living, you can help reduce your risk of ... Get the screening tests you need Maintain a healthy weight Eat a variety of healthy foods, and ...

  12. Bachelor Living

    ERIC Educational Resources Information Center

    Germer, Sondra

    1974-01-01

    Male high school students in a Bachelor Living Class observed methods of child care including bottle feeding, spoon feeding, changing diapers, and method of holding. The purpose was for the students to grasp a better understanding of child development. (EK)

  13. Assisted Living

    MedlinePLUS

    ... many of the same services available in skilled nursing, either by employing personal care staff or contracting with home health agencies and other outside professionals. Learn more about assisted living services and amenities. ...

  14. Interactive Streaming of Structured Data

    E-print Network

    Paluska, Justin Mazzola

    We present ChunkStream, a system for efficient streaming and interactive editing of online video. Rather than using a specialized protocol and stream format, ChunkStream makes use of a generic mechanism employing chunks. ...

  15. Gas stream purifier

    NASA Technical Reports Server (NTRS)

    Adam, Steven J.

    1994-01-01

    A gas stream purifier has been developed that is capable of removing corrosive acid, base, solvent, organic, inorganic, and water vapors as well as particulates from an inert mixed gas stream using only solid scrubbing agents. This small, lightweight purifier has demonstrated the ability to remove contaminants from an inert gas stream with a greater than 99 percent removal efficiency. The Gas Stream Purifier has outstanding market and sales potential in manufacturing, laboratory and science industries, medical, automotive, or any commercial industry where pollution, contamination, or gas stream purification is a concern. The purifier was developed under NASA contract NAS9-18200 Schedule A for use in the international Space Station. A patent application for the Gas Stream Purifier is currently on file with the United States Patent and Trademark Office.

  16. Retiring Lives

    ERIC Educational Resources Information Center

    Carnell, Eileen, Ed.; Lodge, Caroline, Ed.

    2009-01-01

    "Retiring Lives" presents fourteen personal real life stories from people at various stages of retiring. Each author recounts their own story about retiring, bringing together many aspects of the experiences: the social, psychological and practical. These inspirational and illustrated stories will encourage the reader to hold up these experiences

  17. Learn & Live.

    ERIC Educational Resources Information Center

    Burness, Patty, Ed.; Snider, William, Ed.

    Along with a companion documentary video, "Learn & Live," this resource manual focuses on innovative schools around the country that are integrating technology and involving parents, business, and the community. Ten chapters are divided into four sections. In Section 1, "Students," two chapters look at learning and assessment. The two chapters in

  18. Gaia Live in School

    NASA Astrophysics Data System (ADS)

    Walton, N. A.; Barnes, R.; Soubiran, C.; Vogt, S.

    2014-07-01

    Gaia is the European Space Agency's (ESA) next major astronomy telescope mission that was launched December 19, 2013. Gaia will measure accurate distances to about one billion stars across our Milky Way, allowing us to better understand how our galaxy formed and evolved. Gaia will have a profound impact on our understand ing of the Universe and the nature of dark matter, and provide a deeper understanding of how planets form around stars in our local neighbourhood. Gaia scientists and science education advisors are organising a Gaia post-launch event to link approximately forty schools across Europe. The event will include a live stream connection to ESA Gaia Mission Control and local Gaia research students to act as explainers and give practical demonstrations in each school. This paper describes the challenges in conducting this Europe-wide event.

  19. User aware video streaming

    NASA Astrophysics Data System (ADS)

    Kerofsky, Louis; Jagannath, Abhijith; Reznik, Yuriy

    2015-03-01

    We describe the design of a video streaming system using adaptation to viewing conditions to reduce the bitrate needed for delivery of video content. A visual model is used to determine sufficient resolution needed under various viewing conditions. Sensors on a mobile device estimate properties of the viewing conditions, particularly the distance to the viewer. We leverage the framework of existing adaptive bitrate streaming systems such as HLS, Smooth Streaming or MPEG-DASH. The client rate selection logic is modified to include a sufficient resolution computed using the visual model and the estimated viewing conditions. Our experiments demonstrate significant bitrate savings compare to conventional streaming methods which do not exploit viewing conditions.

  20. Dynamics of meteor streams

    NASA Technical Reports Server (NTRS)

    Babadjanov, P. B.; Obrubov, Yu. U.

    1987-01-01

    The overwhelming majority of meteor streams are generally assumed to be formed due to the decay of comets. The most effective process of the release of solid particles from a cometary nucleus is their ejection by sublimating gases when the comet approaches the Sun. The results of investigation of the Geminids and Quadrantids meteor stream evolution show that under the influence of planetary perturbations, the stream may originally be flat but then thicken depending on the variation range of orbital inclinations. Eventually, due to planetary perturbations, a meteor stream may take such a shape as to cause the start of several active showers at different solar longitudes.

  1. Inventory of miscellaneous streams

    SciTech Connect

    Lueck, K.J.

    1995-09-01

    On December 23, 1991, the US Department of Energy, Richland Operations Office (RL) and the Washington State Department of Ecology (Ecology) agreed to adhere to the provisions of the Department of Ecology Consent Order. The Consent Order lists the regulatory milestones for liquid effluent streams at the Hanford Site to comply with the permitting requirements of Washington Administrative Code. The RL provided the US Congress a Plan and Schedule to discontinue disposal of contaminated liquid effluent into the soil column on the Hanford Site. The plan and schedule document contained a strategy for the implementation of alternative treatment and disposal systems. This strategy included prioritizing the streams into two phases. The Phase 1 streams were considered to be higher priority than the Phase 2 streams. The actions recommended for the Phase 1 and 2 streams in the two reports were incorporated in the Hanford Federal Facility Agreement and Consent Order. Miscellaneous Streams are those liquid effluents streams identified within the Consent Order that are discharged to the ground but are not categorized as Phase 1 or Phase 2 Streams. This document consists of an inventory of the liquid effluent streams being discharged into the Hanford soil column.

  2. AIAA 20041090 StreamFLO: an Euler solver for streaming

    E-print Network

    Jameson, Antony

    AIAA 2004­1090 StreamFLO: an Euler solver for streaming architectures Massimiliano Fatica , Antony;StreamFLO: an Euler solver for streaming architectures Massimiliano Fatica , Antony Jameson and Juan J", a new high- performance computer system, based on a streaming architecture, that could achieve

  3. Streams and Drainage Systems Stream Channel: natural passageway

    E-print Network

    Gung, Yuancheng

    Streams and Drainage Systems #12; - / - - #12; - - - - #12; (Stream) #12;Stream Channel: natural passageway A stream's discharge may vary along the channel and through the time because drainage basin area. Cross-sectional shape of three natural streams in the drainage basin of the Upper

  4. The many streams of the Magellanic Stream

    E-print Network

    Snezana Stanimirovic; Samantha Hoffman; Carl Heiles; Kevin A. Douglas; Mary Putman; Joshua E. G. Peek

    2008-02-10

    We present results from neutral hydrogen (HI) observations of the tip of the Magellanic Stream (MS), obtained with the Arecibo telescope as a part of the on-going survey by the Consortium for Galactic studies with the Arecibo L-band Feed Array. We find four large-scale, coherent HI streams, extending continously over a length of 20 degrees, each stream possessing different morphology and velocity gradients. The newly discovered streams provide strong support for the tidal model of the MS formation by Connors et al. (2006), which suggested a spatial and kinematic bifurcation of the MS. The observed morphology and kinematics suggest that three of these streams could be interpreted as a 3-way splitting of the main MS filament, while the fourth stream appears much younger and may have originated from the Magellanic Bridge. We find an extensive population of HI clouds at the tip of the MS. Two thirds of clouds have an angular size in the range 3.5'--10'. We interpret this as being due to thermal instability, which would affect a warm tail of gas trailing through the Galactic halo over a characteristic timescale of a few Myrs to a few hundred Myrs. We show that thermal fragments can survive in the hot halo for a long time, especially if surrounded by a <10^6 K halo gas. If the observed clumpy structure is mainly due to thermal instability, then the tip of the MS is at a distance of ~70 kpc. A significant fraction of HI clouds at the tip of the MS show multi-phase velocity profiles, indicating the co-existence of cooler and warmer gas.

  5. Living with your ileostomy

    MedlinePLUS

    ... your digestive system and needed surgery called an ileostomy. The surgery changed the way your body gets ... Standard ileostomy - living with; Brooke ileostomy - living with; Continent ileostomy - living with; Abdominal pouch - living with; End ileostomy - living ...

  6. Citrus waste stream utilization

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Waste streams, generated during fruit processing, consist of solid fruit residues in addition to liquid waste streams from washing operations which must be handled in an environmentally acceptable manner. Unsound fruit from packing houses are usually sent off to be processed for juice and the solid ...

  7. WADEABLE STREAMS ASSESSMENT

    EPA Science Inventory

    This Wadeable Streams Assessment (WSA) provides the first statistically defensible summary of the condition of the nations streams and small rivers, which are so integrally tied to our history. This report brings the results of this ground-breaking study to the American public....

  8. MARYLAND BIOLOGICAL STREAM SURVEY

    EPA Science Inventory

    The Maryland Biological Stream Survey (MBSS) is a multi-year probability-based sampling program designed to assess the status of biological resources in non-tidal streams of Maryland. The MBSS is quantifying the extent to which acidic deposition and other human activities have af...

  9. Asteroid/meteorite streams

    NASA Technical Reports Server (NTRS)

    Drummond, J.

    1991-01-01

    The independent discovery of the same three streams (named alpha, beta, and gamma) among 139 Earth approaching asteroids and among 89 meteorite producing fireballs presents the possibility of matching specific meteorites to specific asteroids, or at least to asteroids in the same stream and, therefore, presumably of the same composition. Although perhaps of limited practical value, the three meteorites with known orbits are all ordinary chondrites. To identify, in general, the taxonomic type of the parent asteroid, however, would be of great scientific interest since these most abundant meteorite types cannot be unambiguously spectrally matched to an asteroid type. The H5 Pribram meteorite and asteroid 4486 (unclassified) are not part of a stream, but travel in fairly similar orbits. The LL5 Innisfree meteorite is orbitally similar to asteroid 1989DA (unclassified), and both are members of a fourth stream (delta) defined by five meteorite-dropping fireballs and this one asteroid. The H5 Lost City meteorite is orbitally similar to 1980AA (S type), which is a member of stream gamma defined by four asteroids and four fireballs. Another asteroid in this stream is classified as an S type, another is QU, and the fourth is unclassified. This stream suggests that ordinary chondrites should be associated with S (and/or Q) asteroids. Two of the known four V type asteroids belong to another stream, beta, defined by five asteroids and four meteorite-dropping (but unrecovered) fireballs, making it the most probable source of the eucrites. The final stream, alpha, defined by five asteroids and three fireballs is of unknown composition since no meteorites have been recovered and only one asteroid has an ambiguous classification of QRS. If this stream, or any other as yet undiscovered ones, were found to be composed of a more practical material (e.g., water or metalrich), then recovery of the associated meteorites would provide an opportunity for in-hand analysis of a potential near-Earth resource.

  10. Stream Databases D. Stott Parker

    E-print Network

    Parker, D. Stott

    Stream Databases D. Stott, etc.), and p* *erformance analysis systems that manipulate streams. Such a projecttools. However. model of stream data processing inherentlyWre-e have concentrated on studying f* *undamen- quires

  11. Streaming potential measurements of biosurfaces

    NASA Technical Reports Server (NTRS)

    Van Wagenen, R. A.; Andrade, J. D.; Hibbs, J. B., Jr.

    1976-01-01

    A technique based on the measurement of streaming potentials has been developed to evaluate the electrokinetic region of the cell periphery. This approach is feasible for cell lines propagated in in-vitro cell cultures in monolayer form. The advantage of this system is that cells may be evaluated in the living state atttached to a substrate; it is not necessary to subject the cells to enzymatic, chemical, or mechanical trauma required to obtain monodisperse suspensions which are then normally evaluated by microelectrophoresis. In this manner, it should be possible to study the influence of substrate and environmental factors on the charge density and potential at the cell periphery. The apparatus and procedure are described as well as some results concerning the electrokinetic potential of borosilicate capillaries as a function of ionic strength, pH, and temperature. The effect that turbulence and entrance flow conditions have on accurate streaming-potential measurements is discussed. The electrokinetic potential of BALB/c 3T12 fibroblasts has been quantified as a function of pH, ionic strength, glutaraldehyde fixation, and Giemsa staining.

  12. Performance Analysis of Home Streaming Video Using Orb Rabin Karki, Thangam Seenivasan, Mark Claypool and Robert Kinicki

    E-print Network

    Claypool, Mark

    radio, broadcast television (if the home PC has TV tuner card) and even live video streaming from one such personal video streaming system called Orb in a closed network environ- ment, allowing usPerformance Analysis of Home Streaming Video Using Orb Rabin Karki, Thangam Seenivasan, Mark

  13. A Progressive Flow Auction Approach For Low-Cost On-Demand P2P Media Streaming

    E-print Network

    Li, Zongpeng

    1 A Progressive Flow Auction Approach For Low-Cost On-Demand P2P Media Streaming Zongpeng Li, Anirban Mahanti Abstract-- Realizing on-demand media streaming in a Peer-to-Peer (P2P) fashion is more challenging than in the case of live media streaming, since only peers with close-by media play progresses may

  14. Amyloplast movement in living statocytes

    NASA Technical Reports Server (NTRS)

    Leopold, A. C.; Sack, F.

    1984-01-01

    Much evidence implicates amyloplast movement in plant graviperception. How this signal is transduced into a differential growth response is not known. Studies using fixed tissue are useful for deriving mean sedimentation rates, but cannot yield data on: the movement of individual amyloplasts, the role of cytoplasmic streaming, and the initial dynamic events occurring during the presentation time. These limitations were overcome by examining living tissue sections with a horizontally mounted microscope connected to a video camera and recorder. The kinetics of the early response to reorientation are consistent with the hypothesis that amyloplasts act by contact with a sensitive surface near the lower wall and indicate that cytoplasmic streaming provides an important vector in amyloplast redistribution in response to gravity.

  15. Twitter Stream Archiver

    SciTech Connect

    2014-07-01

    The Twitter Archiver system allows a user to enter their Twitter developer account credentials (obtained separately from the Twitter developer website) and read from the freely available Twitter sample stream. The Twitter sample stream provides a random sample of the overall volume of tweets that are contributed by users to the system. The Twitter Archiver system consumes the stream and serializes the information to text files at some predefined interval. A separate utility reads the text files and creates a searchable index using the open source Apache Lucene text indexing system.

  16. Enabling Live Internet Broadcasting Using an Application Endpoint Architecture

    E-print Network

    , but also in live broadcast scenarios. In the past two years, we have built an operational videoEnabling Live Internet Broadcasting Using an Application Endpoint Architecture Yang-hua Chu CMU-level Multicast, Video Broadcasting, Multimedia Streaming, Economic Incentive, Taxation. #12;Abstract It has been

  17. Enabling Live Internet Broadcasting Using an Application Endpoint Architecture

    E-print Network

    , but also in live broadcast scenarios. In the past two years, we have built an operational videoEnabling Live Internet Broadcasting Using an Application Endpoint Architecture Yanghua Chu CMUlevel Multicast, Video Broadcasting, Multimedia Streaming, Economic Incentive, Taxation. #12; Abstract It has been

  18. StreamCloud: A Large Scale Data Streaming System

    E-print Network

    Politcnica de Madrid, Universidad

    StreamCloud: A Large Scale Data Streaming System Vincenzo Gulisano1 , Ricardo Jimenez-Peris1.Valduriez@inria.fr Abstract-- Data streaming has become an important paradigm for the real-time processing of continuous data, streams that, even for a single query operator, require the capacity of potentially many machines

  19. River and Stream Pollution

    MedlinePLUS

    ... washing into lakes and streams comes from exposed earth. This exposed earth includes plowed fields, construction sites, and areas that ... using new methods to reduce the amount of earth they disturb. Bacteria Bacteria are also a big ...

  20. Ramification of stream networks

    E-print Network

    Devauchelle, Olivier

    The geometric complexity of stream networks has been a source of fascination for centuries. However, a comprehensive understanding of ramificationthe mechanism of branching by which such networks growremains elusive. ...

  1. Urban Stream Ecology

    EPA Science Inventory

    Urban watersheds characteristically have high impervious surface cover, resulting in high surface runoff and low infiltration following storms. In response, urban streams experience flashy stormflows, reduced baseflows, bank erosion, channel widening, and sedimentation. Urban ...

  2. Experimental Stream Section

    USGS Multimedia Gallery

    Researchers at the Columbia Environmental Research Centerwill use experimental streams with sand, gravel or cobble bottoms to help to determine the influence of the different substrates on hatch and initiation of dispersal of pallid sturgeon free-embryos....

  3. Streaming tearing mode

    NASA Technical Reports Server (NTRS)

    Shigeta, M.; Sato, T.; Dasgupta, B.

    1985-01-01

    The magnetohydrodynamic stability of streaming tearing mode is investigated numerically. A bulk plasma flow parallel to the antiparallel magnetic field lines and localized in the neutral sheet excites a streaming tearing mode more strongly than the usual tearing mode, particularly for the wavelength of the order of the neutral sheet width (or smaller), which is stable for the usual tearing mode. Interestingly, examination of the eigenfunctions of the velocity perturbation and the magnetic field perturbation indicates that the streaming tearing mode carries more energy in terms of the kinetic energy rather than the magnetic energy. This suggests that the streaming tearing mode instability can be a more feasible mechanism of plasma acceleration than the usual tearing mode instability.

  4. Lone Star Healthy Streams: Keeping Texas streams clean

    E-print Network

    Boutwell, Kathryn S.

    2013-01-01

    stream_source_info Lone star healthy streams.pdf.txt stream_content_type text/plain stream_size 8180 Content-Encoding windows-1252 stream_name Lone star healthy streams.pdf.txt Content-Type text/plain; charset=windows-1252... Winter 2013 tx H2O 25 Story by Kathryn S. Boutwell ] The Lone Star Healthy Streams program recommends moving livestock from one area to another over time to prevent fecal material from accumulating in creek pastures. Photo from Crestock...

  5. Chaos and stellar streams

    NASA Astrophysics Data System (ADS)

    Price-Whelan, Adrian M.; Johnston, Kathryn V.; Valluri, Monica; Pearson, Sarah; Kupper, Andreas Hans Wilhelm; Hogg, David W.

    2016-01-01

    Cosmological simulations predict that dark matter halos around galaxies should be triaxial in shape with universal density profiles. A significant number of orbits in such systems are chaotic, though it is commonly assumed that chaos is not dynamically relevant for galaxy halos because the timescales over which chaos is computed to be important are generally long relative to the dynamical time. In recent work, we showed that even when chaos is not important for restructuring the global structure of a galaxy, chaos can greatly enhance the density evolution and alter the morphologies of stellar streams over just a few orbital times by causing streams to 'fan out.' This occurs because the orbits of the stars in stellar streams have small distributions of fundamental frequencies and are therefore sensitive to mild chaos that modulates the frequencies on small-scales over much faster timescales. This suggests that the morphology of tidal streams alone can be used to estimate the significance of chaos along the orbits of the progenitor systems, thereby placing constraints on the global properties of the gravitational potential. I will explain our theoretical understanding of this phenomenon and discuss implications for a recently discovered stellar stream (the Ophiuchus stream) that may be on a chaotic orbit in the inner Milky Way due to the influence of the time-dependent, triaxial potential of the Galactic bar.

  6. Live Virus Smallpox Vaccine

    MedlinePLUS

    ... Index SMALLPOX FACT SHEET The Live Virus Smallpox Vaccine The vaccinia virus is the "live virus" used ... cannot cause smallpox. What is a "live virus" vaccine? A "live virus" vaccine is a vaccine that ...

  7. Stream Cipher Criteria Erik Zenner

    E-print Network

    Zenner, Erik

    Stream Cipher Criteria Erik Zenner CRYPTICO A/S info@cryptico.com Abstract. The eStream project has given us a number of insights into design criteria for stream ciphers. Some of them were disputed document and gives the author's views on their relevance for stream cipher design. It does not contain any

  8. Video BenchLab: An Open Platform for Realistic Benchmarking of Streaming Media Workloads

    E-print Network

    Massachusetts at Amherst, University of

    or inexpensive digital camcorders. Online services such as YouTube, Netflix and live streaming services benchmarking tools exist [26], they present difficulties for free research use or may not be amenable

  9. Does the restoration of an inner-city stream in Seoul affect local thermal environment?

    NASA Astrophysics Data System (ADS)

    Kim, Y.-H.; Ryoo, S.-B.; Baik, J.-J.; Park, I.-S.; Koo, H.-J.; Nam, J.-C.

    2008-05-01

    Changes in local thermal environment associated with the restoration of an inner-city stream in Seoul, Korea, are investigated using observational data. The stream, called the Cheonggye stream, which had been hidden and covered with cement/asphalt for 46 years, runs 5.8 km eastward through a central region of Seoul. Intensive observations were made in the stream area for a number of summertime periods before, during, and after the stream restoration to detect the effects of the stream on local environment and to quantify them. It is estimated that after the stream restoration the near-surface temperature averaged over the stream area dropped by 0.4 C, with the largest local temperature drop being 0.9 C. However, it cannot be stated that this 0.4 C temperature drop is due entirely to the stream effect only, because synoptic-scale and local-scale weather conditions during the two periods were inevitably not identical. The stream effect on air temperature is also evident in the temperature distribution along a street traversing the stream. In the daytime after the stream restoration, the sensible heat flux was greatly reduced and the ratio of sensible heat flux to net radiative flux dramatically decreased. These first-time results of the restored-stream effects on urban thermal environment could contribute to the scientific basis of urban planning which aims to make a large city comfortable to live in and nature- and environment-friendly.

  10. Consider an Ice Stream.

    NASA Astrophysics Data System (ADS)

    Bindschadler, R.

    2002-12-01

    Forty years ago, John Nye was one of the leaders who introduced the rigors of classical physics to glaciology. His elegant treatments frequently took advantage of the then recent discovery that ice could be approximated as a plastic material. With this viewpoint, Nye was able to explain the shape of ice sheets and glaciers, to predict the expected pattern of stress and velocity within a glacier, and to derive the advance and retreat of a glacier from the record of accumulation and ablation. These advances have given generations of glaciologists tools to interpret the excellent observational record of glacier behavior and variation. In the 1980s, glaciologist, weaned on these works of Nye and of other similarly adept colleagues, carried their lessons to West Antarctica to study ice streams, the vast conveyor belts of ice that discharged nearly as much Antarctic ice as the much larger East Antarctic ice sheet. Ice streams were a glaciological conundrum. Despite the gently sloping surface, these broad features roared along, moving fastest when the gravitational impetus was least. After two decades of research, ice streams still have not given up all their secrets, yet much is now known. Internal deformation is negligible. Basal friction is frequently nil leaving the shattered margins as the primary means to avoid rapid wastage of the ice sheet. Within the margins, the resistive force results from a delicate balance of heat and evolving ice fabrics. Nevertheless, the bed beneath an ice stream cannot be ignored. It is ultimately the state of the underlying marine sediment that determines whether the ice stream can slide at all. There too, the heat balance is critical with an influx of water required to keep the bed wet enough to let the streams glide along. Ice stream research has been the portal through which glaciologists have seen and identified the complexities of West Antarctic ice sheet dynamics. Remarkably, nearly all time scales seem important. Ice stream positions in past millennia conform to radically different flow patterns while on the scale of hours an ice stream's motion is halted completely, then released to move at surge-like speeds, in tempo with the tides. Explaining these complexities constantly reminds us that the rigorous physics applied to ice so effectively by Nye still work.

  11. MEASUREMENT OF THE CONGESTION RESPONSIVENESS OF REALPLAYER STREAMING VIDEO OVER UDP

    E-print Network

    Claypool, Mark

    streaming videos of news broadcasts, music television, live sporting events and more. For exam- ple, in 2001-Friendliness of RealVideo over UDP and correlate the results with network and application layer statistics. We find conferences and Internet videos stream at about 0.1 Mbps1 , VCR quality videos at about 1.2 Mbps2 , broadcast

  12. Multi-Layer Video Streaming with Helper Nodes using Network Coding

    E-print Network

    Wu, Jie

    be extended to the case of wireless live streaming, in which a set of videos is broadcast. We carefully studyMulti-Layer Video Streaming with Helper Nodes using Network Coding Pouya Ostovari, Abdallah-layer video, intra-layer coding, inter-layer coding, wireless network. I. INTRODUCTION As the requirements

  13. A Reflection on Coursestream System: A Virtual Classroom Streaming System Designed for Large Classes

    ERIC Educational Resources Information Center

    Halper, Sachiko; Kelly, Kevin; Chuang, Wen Hao

    2007-01-01

    Delivering courses using streaming media has been an effective vehicle for online education in recent years. At San Francisco State University (SFSU), several courses are offered fully online using streaming media, and each semester over five thousand students take advantage of them. Students can view or listen to live or archived lectures online

  14. Optimal Proxy Cache Allocation for Efficient Streaming Media Distribution

    E-print Network

    Adler, Micah

    networked streaming media applications such as live video broadcasts, distance education, corporate to a couple of hours) of digi tal video, server and network bandwidths are proving to be ma jor limiting of the funding agencies. innovative ways to reduce server and network loads, for serv ing a popular video

  15. Using Multicast for Streaming Videos across Wide Area Networks

    E-print Network

    Adler, Micah

    Using Multicast for Streaming Videos across Wide Area Networks Bing Wang , Subhabrata Sen , Micah bandwidth requirements and the longlived nature of digital videos make this medium particularly resource bandwidth or the network bandwidth in a broadcast LAN environment. In either case, the bandwidth usage

  16. Open Source Initiative Powers Real-Time Data Streams

    NASA Technical Reports Server (NTRS)

    2014-01-01

    Under an SBIR contract with Dryden Flight Research Center, Creare Inc. developed a data collection tool called the Ring Buffered Network Bus. The technology has now been released under an open source license and is hosted by the Open Source DataTurbine Initiative. DataTurbine allows anyone to stream live data from sensors, labs, cameras, ocean buoys, cell phones, and more.

  17. Meandering stream reservoirs

    SciTech Connect

    Richardson, J.G.; Sangree, J.B.; Sneider, R.M.

    1987-12-01

    Braided stream deposits, described in a previous article in this series, and meandering stream deposits commonly are excellent reservoirs. Meandering high-sinuousity channels are found on flat alluvial plains with slopes less than 1 1/2/sup 0/ (0.026 rad). These rivers have wide ranges of discharges from low-water flow to flood stage. Two main processes are responsible for development of sand bodies. These are point-bar deposits left by channel migration, and oxbow-lake deposits left in loops of the river course abandoned when the stream cuts a new course during flooding. Extremely high floods spill over the banks and deposit sheets of very fine sand, silt, and clay onto the flood plain.

  18. Paleo-ice stream types

    NASA Astrophysics Data System (ADS)

    Kleman, J.; de Angelis, H.; Greenwood, S.

    2010-12-01

    During mapping of the Laurentide and Fennoscandian ice sheet beds we have observed and mapped a large number of paleo-ice streams, including apparently anomalous ice streams ocurring on high shear-stress bed materials, and with little or no topographic guidance. In addition, we have found evidence that in several places in the Canadian Arctic there developed a special category of small ephemeral ice streams during the deglaciation. They indicate flow patterns that are very different from older semi-stable ice streams in the respective areas. These observations of several types of "anomalous" ice streams lead us to think that scientific understanding of ice-stream behaviour has been hampered by an over-simplified terminology that presupposes that ice streams are one phenomenon, largely governed by one set of controls. Instead we hold the view that an understanding of ice-stream behaviour must start with a subdivision of the term "ice stream" into genetically distinct categories, with research focused at clarifying the controls for each category. A tentative classification scheme for paleo-ice streams should comprise at least five different types of ice streams, i/ Classical ice streams which occur on an excessively lubricated bed, i.e. preferably over fine-grained substrate with low permeability. Most of these ice streams terminated in lacustrine or marine water bodies. The numerous Baltic Ice Streams and the Cochrane surges into glacial lakes Agassis/Ojibway are examples of this type, ii/ Semi-stable ice streams which exist in locations where overall ice-sheet geometry favors the occurrence of long-lasting convergent flow, i.e. downstream of saddles in the ice-sheet surface. The re - Trondheim area in Scandinavia was likely a site for such an ice stream, iii/ Transient rigid-bed ice streams, which form without obvious topographical or substratum control when thawed spots start to develop under a largely cold-based ice sheet, which then finds itself with a steeper profile than the reduced bed traction can sustain. The unnamed Finnish ice streams that terminate in the Salpausselk lobes are prime examples, and the Dubawnt ice stream in Keewatin may also be of this type, iiii/ Topographic ice streams, which are constrained by topography and fixed in space but variable in time. The Hudson Strait, Laurentian Channel, and Norwegian Channel ice streams are prime candidates for this type, and iiiii/ Re-equilibration ice streams, which probably develop as a response to rapid calving and breakup of ice in adjacent marine areas. Good examples are the east-trending ice stream on Prince of Wales Island, the small Cap Krusenstern ice stream and numerous ice streams on Baffin Island.

  19. Living Nanomachines

    NASA Astrophysics Data System (ADS)

    Carlier, M.-F.; Helfer, E.; Wade, R.; Haraux, F.

    The living cell is a kind of factory on the microscopic scale, in which an assembly of modular machines carries out, in a spatially and temporally coordinated way, a whole range of activities internal to the cell, including the synthesis of substances essential to its survival, intracellular traffic, waste disposal, and cell division, but also activities related to intercellular communication and exchanges with the outside world, i.e., the ability of the cell to change shape, to move within a tissue, or to organise its own defence against attack by pathogens, injury, and so on. These nanomachines are made up of macromolecular assemblies with varying degrees of complexity, forged by evolution, within which work is done as a result of changes in interactions between proteins, or between proteins and nucleic acids, or between proteins and membrane components. All these cell components measure a few nanometers across, so the mechanical activity of these nanomachines all happens on the nanometric scale. The directional nature of the work carried out by biological nanomachines is associated with a dissipation of energy. As examples of protein assemblies, one could mention the proteasome, which is responsible for the degradation of proteins, and linear molecular motors such as actomyosin, responsible for muscle contraction, the dynein-microtubule system, responsible for flagellar motility, and the kinesin-microtubule system, responsible for transport of vesicles, which transform chemical energy into motion. Nucleic acid-protein assemblies include the ribosome, responsible for synthesising proteins, polymerases, helicases, elongation factors, and the machinery of DNA replication and repair; the mitotic spindle is an integrated system involving several of these activities which drive chromosome segregation. The machinery coupling membranes and proteins includes systems involved in the energy metabolism, such as the ATP synthase rotary motor, signalling cascades, endocytosis and phagocytosis complexes, and also dynamic membrane-cytoskeleton complexes which generate protrusion forces involved in cell adhesion and migration. The ideas of molecular recognition and controlled interfaces between biological components provide the underlying mechanisms for biological machinery and networks [1]. Many proteins illustrate this principle by their modular organisation into domains. The juxtaposition of catalytic domains of known function and domains of interaction with different partners leads to the emergence of new biological functions. It can also create threshold mechanisms, or biological switches, by triggering the activity of a given domain only when several partners interact with the regulatory domains. Many of these interaction domains are well understood. They exist inside different proteins, in particular, in cell signaling networks, and could potentially be used as building blocks in the construction of new proteins.

  20. UTSA's SmartLiving Campus: A Real Time Approach to America's Future

    E-print Network

    Gomez, J.

    2013-01-01

    ESL-KT-13-12-22 CATEE 2013: Clean Air Through Energy Efficiency Conference, San Antonio, Texas Dec. 16-18 San Antonio: SmartLiving City San Antonio 1.33 Million People 440,000 Single Family Homes Fastest growing city of the top 10 largest cities... stream_source_info ESL-KT-13-12-22.pdf.txt stream_content_type text/plain stream_size 2544 Content-Encoding UTF-8 stream_name ESL-KT-13-12-22.pdf.txt Content-Type text/plain; charset=UTF-8 UTSA SmartLiving CampusA Real...

  1. ECHO: a community video streaming system with interactive visual overlays

    NASA Astrophysics Data System (ADS)

    Cheung, Gene; Tan, Wai-tian; Shen, Bo; Ortega, Antonio

    2008-01-01

    We describe a networked video application where personalized avatars, controlled by a group of "hecklers", are overlaid on top of a real-time encoded video stream of an Internet game for multicast consumption. Rather than passively observing the streamed content individually, the interactivity of the controllable avatars, along with heckling voice exchange, engenders a sense of community during group viewing. We first describe how the system splits video into independent regions with and without avatars for processing in order to minimize complexity. Observing that the region with avatars is more delay-sensitive due to their interactivity, we then show that the regions can be logically packetized into separable sub-streams, and be transported and buffered with different delay requirements, so that the interactivity of the avatars can be maximized. The utility of our system extends beyond Internet game watching to general community streaming of live or pre-encoded video with visual overlays.

  2. STREAM WATER QUALITY MODEL

    EPA Science Inventory

    QUAL2K (or Q2K) is a river and stream water quality model that is intended to represent a modernized version of the QUAL2E (or Q2E) model (Brown and Barnwell 1987). Q2K is similar to Q2E in the following respects:

    • One dimensional. The channel is well-mixed vertically a...

    • Practical Meteor Stream Forecasting

      NASA Technical Reports Server (NTRS)

      Cooke, William J.; Suggs, Robert M.

      2003-01-01

      Inspired by the recent Leonid meteor storms, researchers have made great strides in our ability to predict enhanced meteor activity. However, the necessary calibration of the meteor stream models with Earth-based ZHRs (Zenith Hourly Rates) has placed emphasis on the terran observer and meteor activity predictions are published in such a manner to reflect this emphasis. As a consequence, many predictions are often unusable by the satellite community, which has the most at stake and the greatest interest in meteor forecasting. This paper suggests that stream modelers need to pay more attention to the needs of this community and publish not just durations and times of maxima for Earth, but everything needed to characterize the meteor stream in and out of the plane of the ecliptic, which, at a minimum, consists of the location of maximum stream density (ZHR) and the functional form of the density decay with distance from this point. It is also suggested that some of the terminology associated with meteor showers may need to be more strictly defined in order to eliminate the perception of crying wolf by meteor scientists. An outburst is especially problematic, as it usually denotes an enhancement by a factor of 2 or more to researchers, but conveys the notion of a sky filled with meteors to satellite operators and the public. Experience has also taught that predicted ZHRs often lead to public disappointment, as these values vastly overestimate what is seen.

    • Toward Third Stream Evaluation.

      ERIC Educational Resources Information Center

      Della-Piana, Gabriel M.; Endo, George T.

      Third stream evaluation, the fusing of the ecological perspective with experimental or quasi-experimental evaluation design, is described. The ecological perspective necessitates that the conceptualization and analysis of a setting and the design of the study emphasize the interdependent relations among organisms, behavior and environment in

    • BALTIMORE STREAM RESTORATION PROJECT

      EPA Science Inventory

      26 Feb 2003



      Approach - We will employ a 4-tiered research approach to investigate restoration effects on hydrology and stream water quality: 1) monitoring ground water and surface water, 2) quantifying denitrification activity, 3) measuring carbon supply and rete...

    • STREAMS_P

      EPA Science Inventory

      Streams (polygon features) coverage showing some double line rivers and islands on the Colorado River Indian Reservation in Arizona. This coverage was digitized off of USGS 7.5 minute quad maps by the Phoenix office of the Bureau of Indian Affairs.

    • A Simulated Stream Ecology Study.

      ERIC Educational Resources Information Center

      Zampella, Robert A.

      1979-01-01

      Describes a simulated field experience to study stream ecology in the classroom. Secondary students determine the composition of the stream community, describe the distribution of the benthic invertebrates, and design a food web. (Author/MA)

    • Benthic Macroinvertebrates in Wadeable Streams

      EPA Science Inventory

      This indicator describes the presence and distribution of benthic macroinvertebrates in wadeable streams nationwide as surveyed from 2000 to 2004. Benthic macroinvertebrates are particularly sensitive to disturbances in stream chemistry and physical habitat, making their prese...

    • Stream aquifer interactions: analytical solution to estimate stream depletions caused by stream stage fluctuations and pumping wells near streams

      E-print Network

      Intaraprasong, Trin

      2009-05-15

      This dissertation is composed of three parts of contributions. Systems of a fully penetrating pumping well in a confined aquifer near a fully penetrating stream with and without streambeds are discussed in Chapter II. In Chapter III, stream-aquifer...

    • Live Video and IP-TV

      NASA Astrophysics Data System (ADS)

      Merani, Maria Luisa; Saladino, Daniela

      This Chapter aims at providing a comprehensive insight into the most recent advances in the field of P2P architectures for video broadcasting, focusing on live video streaming P2P live video streaming . After introducing a classification of P2P video solutions, the first part of the Chapter provides an overview of the most interesting P2P IP-TV P2P IP-TV systems currently available over the Internet. It also concentrates on the process of data diffusion within the P2P overlay and complements this view with some measurements that highlight the most salient features of P2P architectures. The second part of the Chapter completes the view, bringing up the modeling efforts to capture the main characteristics and limits of P2P streaming systems, both analytically and numerically. The Chapter is closed by a pristine look at some challenging, open questions, with a specific emphasis on the adoption of network coding in P2P streaming solutions.

    • Thermal Regimes of Northeast Streams

      E-print Network

      , Massachusetts Division of Fish and Wildlife, Ralph Abele, USEPA Region I, M. Carpenter, NHFG, D. Neils, NHDES of High-Quality Coldwater Streams in New England (USEPA) Task 1: Develop a stream temperature database Regime Urbanization Drivers #12;185 Stream Temperature Sampling Sites 2005-2009 Overview Database

    • Denitrification of a gas stream

      SciTech Connect

      Tamony, A.E.; Youngson, C.R.

      1981-10-13

      Nitric oxide and other oxides of nitrogen is removed from a gas stream by contacting the gas stream with chlorine in the presence of water in the liquid phase and scrubbing the gas stream with an aqueous mixture of a hydrochloride and a hypochlorite.

    • STREAM CATALOG OF SOUTHEASTERN ALASKA

      E-print Network

      465 STREAM CATALOG OF SOUTHEASTERN ALASKA REGULATORY DISTRICT No. 3 AND 4 SPECIAL SaENTIFIC REPORT part of Southeastern Alaska salmon streams is cata- loged from the voluminous records of the Alaska of Washington, the U.S. Fish and Wildlife Service, and other agencies. Stream descriptions, maps, and historical

    • STREAM CATALOG OF SOUTHEASTERN ALASKA

      E-print Network

      453 STREAM CATALOG OF SOUTHEASTERN ALASKA REGULATORY DISTRICT No. 2 SPECIAL SCIENTIFIC REPORT part of Southeastern Alaska salmon streams is cata- loged from the voluminous records of the Alaska of Washington, the U. S. Fish and Wildlife Service, and other agencies. Stream descriptions, maps

    • A direct approach for quantifying stream shading

      Technology Transfer Automated Retrieval System (TEKTRAN)

      Excessive stream water temperature causes thermal stress in fish and invertebrates, decreases dissolved oxygen, and encourages bacterial and algal growth. Solar radiation affects stream temperature. Shade cast by riparian vegetation reduces thermal inputs to stream water. Stream shading standards...

    • Meteor Stream Membership Criteria

      E-print Network

      Jozef Klacka

      2000-05-25

      Criteria for the membership of individual meteors in meteor streams are discussed from the point of view of their mathematical and also physical properties. Discussion is also devoted to the motivation. It is shown that standardly used criteria (mainly D-criterion of Southworth and Hawkins, 1963) have unusual mathematical properties in the sense of a term ``distance'', between points in a phase space, and, physical motivation and realization for the purpose of obtaining their final form is not natural and correct, and, moreover, they lead also to at least surprising astrophysical results. General properties of possible criteria are discussed. A new criterion for the membership in meteor streams is suggested. It is based on probability theory. Finally, a problem of meteor orbit determination for known parent body is discussed.

    • Autonomous Byte Stream Randomizer

      NASA Technical Reports Server (NTRS)

      Paloulian, George K.; Woo, Simon S.; Chow, Edward T.

      2013-01-01

      Net-centric networking environments are often faced with limited resources and must utilize bandwidth as efficiently as possible. In networking environments that span wide areas, the data transmission has to be efficient without any redundant or exuberant metadata. The Autonomous Byte Stream Randomizer software provides an extra level of security on top of existing data encryption methods. Randomizing the data s byte stream adds an extra layer to existing data protection methods, thus making it harder for an attacker to decrypt protected data. Based on a generated crypto-graphically secure random seed, a random sequence of numbers is used to intelligently and efficiently swap the organization of bytes in data using the unbiased and memory-efficient in-place Fisher-Yates shuffle method. Swapping bytes and reorganizing the crucial structure of the byte data renders the data file unreadable and leaves the data in a deconstructed state. This deconstruction adds an extra level of security requiring the byte stream to be reconstructed with the random seed in order to be readable. Once the data byte stream has been randomized, the software enables the data to be distributed to N nodes in an environment. Each piece of the data in randomized and distributed form is a separate entity unreadable on its own right, but when combined with all N pieces, is able to be reconstructed back to one. Reconstruction requires possession of the key used for randomizing the bytes, leading to the generation of the same cryptographically secure random sequence of numbers used to randomize the data. This software is a cornerstone capability possessing the ability to generate the same cryptographically secure sequence on different machines and time intervals, thus allowing this software to be used more heavily in net-centric environments where data transfer bandwidth is limited.

    • Multi-Stream Inflation

      E-print Network

      Miao Li; Yi Wang

      2009-07-24

      We propose a "multi-stream" inflation model, which is a double field model with spontaneous breaking and restoration of an approximate symmetry. We calculate the density perturbation and non-Gaussianity in this model. We find that this model can have large, scale dependent, and probably oscillating non-Gaussianity. We also note that our model can produce features in the CMB power spectrum and hemispherical power asymmetry.

    • Biotech Outsourcing Strategies cmcBiologics stream

      PubMed Central

      2010-01-01

      Now in its third year, the Biotech Outsourcing Strategies (BOS) meeting organized by Bio2Business took place at the Shuset Conference Centre in Hrsholm, Copenhagen. The focus of this year's event was the demanding and challenging area of chemistry, manufacturing and controls (CMC), and the meeting provided ample opportunity for lively discussion of the key issues surrounding this area. New for the 2010 conference, a biologics-focused lecture stream ran in parallel to the established small molecule stream. Both streams boasted a distinguished panel of keynote speakers who discussed all aspects of CMC from early stage scale-up through late stage clinical development. In addition to the keynote speakers, selected contract research organizations (CROs) gave short presentations on the solutions that they could provide to some of the challenges facing CMC. The meeting attracted more than 150 delegates from leading drug development companies and CRO service providers, and greatly facilitated the forging of new working relationships through pre-arranged one-to-one meetings. Moreover, exhibitions from event sponsors and considerable scheduled networking time over lunch and evening receptions further enhanced the highly productive and interactive nature of the meeting. PMID:20716956

    • Gas stream cleanup

      SciTech Connect

      Bossart, S.J.; Cicero, D.C.; Zeh, C.M.; Bedick, R.C.

      1990-08-01

      This report describes the current status and recent accomplishments of gas stream cleanup (GSCU) projects sponsored by the Morgantown Energy Technology Center (METC) of the US Department of Energy (DOE). The primary goal of the Gas Stream Cleanup Program is to develop contaminant control strategies that meet environmental regulations and protect equipment in advanced coal conversion systems. Contaminant control systems are being developed for integration into seven advanced coal conversion processes: Pressurized fludized-bed combustion (PFBC), Direct coal-fueled turbine (DCFT), Intergrated gasification combined-cycle (IGCC), Gasification/molten carbonate fuel cell (MCFC), Gasification/solid oxide fuel cell (SOFC), Coal-fueled diesel (CFD), and Mild gasification (MG). These advanced coal conversion systems present a significant challenge for development of contaminant control systems because they generate multi-contaminant gas streams at high-pressures and high temperatures. Each of the seven advanced coal conversion systems incorporates distinct contaminant control strategies because each has different contaminant tolerance limits and operating conditions. 59 refs., 17 figs., 5 tabs.

  1. StreamAuction Providing Auction Service Through

    E-print Network

    Kaiserslautern, Universitt

    through StreamSpin 3 #12;StructureStreamAuction Server new New auction at StreamAuction StreamSpin users receive new auction info bid update 4 StreamSpin Server new new Users send their bids directly GUI New user New user New auction List auctions Bidding page pushed through StreamSpin 5

  2. Live Lecture Delivery And Interaction System: Brihaspati_Sync (An integrated Learning environment over Internet)

    E-print Network

    Singh Yatindra Nath

    the learning objectives. Live lecture are not only attractive from the learners' point of view through our system. The lecture is transmitted as multiple media streams by the instructor client to all other student clients. As a student client receive the streams and it present it to the user on the user

  3. Riparian deforestation, stream narrowing, and loss of stream ecosystem services

    PubMed Central

    Sweeney, Bernard W.; Bott, Thomas L.; Jackson, John K.; Kaplan, Louis A.; Newbold, J. Denis; Standley, Laurel J.; Hession, W. Cully; Horwitz, Richard J.

    2004-01-01

    A study of 16 streams in eastern North America shows that riparian deforestation causes channel narrowing, which reduces the total amount of stream habitat and ecosystem per unit channel length and compromises in-stream processing of pollutants. Wide forest reaches had more macroinvertebrates, total ecosystem processing of organic matter, and nitrogen uptake per unit channel length than contiguous narrow deforested reaches. Stream narrowing nullified any potential advantages of deforestation regarding abundance of fish, quality of dissolved organic matter, and pesticide degradation. These findings show that forested stream channels have a wider and more natural configuration, which significantly affects the total in-stream amount and activity of the ecosystem, including the processing of pollutants. The results reinforce both current policy of the United States that endorses riparian forest buffers as best management practice and federal and state programs that subsidize riparian reforestation for stream restoration and water quality. Not only do forest buffers prevent nonpoint source pollutants from entering small streams, they also enhance the in-stream processing of both nonpoint and point source pollutants, thereby reducing their impact on downstream rivers and estuaries. PMID:15381768

  4. Producing a Live HDTV Program from Space

    NASA Technical Reports Server (NTRS)

    Grubbs, Rodney; Fontanot, Carlos; Hames, Kevin

    2007-01-01

    By the year 2000, NASA had flown HDTV camcorders on three Space Shuttle missions: STS-95, STS-93 and STS-99. All three flights of these camcorders were accomplished with cooperation from the Japanese space agency (then known as NASDA and now known as JAXA). The cameras were large broadcast-standard cameras provided by NASDA and flight certified by both NASA and NASDA. The high-definition video shot during these missions was spectacular. Waiting for the return of the tapes to Earth emphasized the next logical step: finding a way to downlink the HDTV live from space. Both the Space Shuttle and the International Space Station (ISS) programs were interested in live HDTV from space, but neither had the resources to fully fund the technology. Technically, downlinking from the ISS was the most effective approach. Only when the Japanese broadcaster NHK and the Japanese space agency expressed interest in covering a Japanese astronaut's journey to the ISS did the project become possible. Together, JAXA and NHK offered equipment, technology, and funding toward the project. In return, NHK asked for a live HDTV downlink during one of its broadcast programs. NASA and the ISS Program sought a US partner to broadcast a live HDTV program and approached the Discovery Channel. The Discovery Channel had proposed a live HDTV project in response to NASA's previous call for offers. The Discovery Channel agreed to provide addItional resources. With the final partner in place, the project was under way. Engineers in the Avionics Systems Division at NASA's Johnson Space Center (JSC) had already studied the various options for downlinking HDTV from the ISS. They concluded that the easiest way was to compress the HDTV so that the resulting data stream would "look" like a payload data stream. The flight system would consist of a professional HDTV camcorder with live HD-SDI output, an HDTV MPEG-2 encoder, and a packetizer/protocol converter.

  5. Flexible server architecture for resource-optimal presentation of Internet multimedia streams to the client

    NASA Astrophysics Data System (ADS)

    Boenisch, Holger; Froitzheim, Konrad

    1999-12-01

    The transfer of live media streams such as video and audio over the Internet is subject to several problems, static and dynamic by nature. Important quality of service (QoS) parameters do not only differ between various receivers depending on their network access, service provider, and nationality, the QoS is also variable in time. Moreover the installed receiver base is heterogeneous with respect to operating system, browser or client software, and browser version. We present a new concept for serving live media streams. It is not longer based on the current one-size-fits all paradigm, where the server offers just one stream. Our compresslet system takes the opposite approach: it builds media streams `to order' and `just in time'. Every client subscribing to a media stream uses a servlet loaded into the media server to generate a tailored data stream for his resources and constraints. The server is designed such that commonly used components for media streams are computed once. The compresslets use these prefabricated components, code additional data if necessary, and construct the data stream based on the dynamic available QoS and other client constraints. A client-specific encoding leads to resource- optimal presentation that is especially useful for the presentation of complex multimedia documents on a variety of output devices.

  6. Analyzing indicators of stream health for Minnesota streams

    USGS Publications Warehouse

    Singh, U.; Kocian, M.; Wilson, B.; Bolton, A.; Nieber, J.; Vondracek, B.; Perry, J.; Magner, J.

    2005-01-01

    Recent research has emphasized the importance of using physical, chemical, and biological indicators of stream health for diagnosing impaired watersheds and their receiving water bodies. A multidisciplinary team at the University of Minnesota is carrying out research to develop a stream classification system for Total Maximum Daily Load (TMDL) assessment. Funding for this research is provided by the United States Environmental Protection Agency and the Minnesota Pollution Control Agency. One objective of the research study involves investigating the relationships between indicators of stream health and localized stream characteristics. Measured data from Minnesota streams collected by various government and non-government agencies and research institutions have been obtained for the research study. Innovative Geographic Information Systems tools developed by the Environmental Science Research Institute and the University of Texas are being utilized to combine and organize the data. Simple linear relationships between index of biological integrity (IBI) and channel slope, two-year stream flow, and drainage area are presented for the Redwood River and the Snake River Basins. Results suggest that more rigorous techniques are needed to successfully capture trends in IBI scores. Additional analyses will be done using multiple regression, principal component analysis, and clustering techniques. Uncovering key independent variables and understanding how they fit together to influence stream health are critical in the development of a stream classification for TMDL assessment.

  7. ASSESSING STREAM BED STABILITY AND EXCESS SEDIMENTATION IN MOUNTAIN STREAMS

    EPA Science Inventory

    Land use and resource exploitation in headwaters catchments?such as logging, mining, and road building?often increase sediment supply to streams, potentially causing excess sedimentation. Decreases in mean substrate size and increases in fine stream bed sediments can lead to inc...

  8. Living with Sarcoidosis

    MedlinePLUS

    ... page from the NHLBI on Twitter. Living With Sarcoidosis Sarcoidosis has no cure, but you can take ... Content: NEXT >> Featured Video Living With and Managing Sarcoidosis 05/18/2011 This videopresented by the ...

  9. Human impacts to mountain streams

    NASA Astrophysics Data System (ADS)

    Wohl, Ellen

    2006-09-01

    Mountain streams are here defined as channel networks within mountainous regions of the world. This definition encompasses tremendous diversity of physical and biological conditions, as well as history of land use. Human effects on mountain streams may result from activities undertaken within the stream channel that directly alter channel geometry, the dynamics of water and sediment movement, contaminants in the stream, or aquatic and riparian communities. Examples include channelization, construction of grade-control structures or check dams, removal of beavers, and placer mining. Human effects can also result from activities within the watershed that indirectly affect streams by altering the movement of water, sediment, and contaminants into the channel. Deforestation, cropping, grazing, land drainage, and urbanization are among the land uses that indirectly alter stream processes. An overview of the relative intensity of human impacts to mountain streams is provided by a table summarizing human effects on each of the major mountainous regions with respect to five categories: flow regulation, biotic integrity, water pollution, channel alteration, and land use. This table indicates that very few mountains have streams not at least moderately affected by land use. The least affected mountainous regions are those at very high or very low latitudes, although our scientific ignorance of conditions in low-latitude mountains in particular means that streams in these mountains might be more altered than is widely recognized. Four case studies from northern Sweden (arctic region), Colorado Front Range (semiarid temperate region), Swiss Alps (humid temperate region), and Papua New Guinea (humid tropics) are also used to explore in detail the history and effects on rivers of human activities in mountainous regions. The overview and case studies indicate that mountain streams must be managed with particular attention to upstream/downstream connections, hillslope/channel connections, process domains, physical and ecological roles of disturbance, and stream resilience.

  10. Living Willow Huts

    ERIC Educational Resources Information Center

    Keeler, Rusty

    2007-01-01

    Living Willow Huts are inexpensive to make, fun to plant, easy to grow, and make beautiful spaces for children. They involve planting dormant willow shoots in the ground and weaving them into shapes that will sprout and grow over time. People have been creating similar living architecture throughout the world for centuries in the forms of living

  11. Strategies of Conflict in Coexisting Streaming Overlays

    E-print Network

    Li, Baochun

    Strategies of Conflict in Coexisting Streaming Overlays Chuan Wu, Baochun Li Department-to-peer streaming overlays, corresponding to channels of programming. With coex- isting streaming overlays, one to satisfy the required streaming rate in each overlay, as well as to minimize streaming costs. In this paper

  12. Data Stream Processing Mengmeng Liu

    E-print Network

    Ives, Zachary G.

    Data Stream Processing Mengmeng Liu Svilen Mihaylov #12;Aurora: Centralized Stream Processing triggers #12;Aurora: System Model #12;Aurora: Load Shedding Load shedding by dropping tuples Improves Identifies semantic importance Converts lowest utility interval to filters Value-based #12;Aurora

  13. SEA LAMPREY SPAWNING: MICHIGAN STREAMS

    E-print Network

    SEA LAMPREY SPAWNING: MICHIGAN STREAMS OF LAKE SUPERIOR Marine Bioiogical Laboratory MAY 2 3 1952 Service, Albert M. Day, Director SEA LAMPREY SPAWNING s MICHIGAN STREAMS OF LAKE SUPERIOR by Howard A decades since the capture of the first specimen in Lake Erie in 1921, the sea lamprey ( Petromyzon marinus

  14. Metamorphisms: Streaming Representation-Changers

    E-print Network

    Gibbons, Jeremy

    Metamorphisms: Streaming Representation-Changers Jeremy Gibbons Computing Laboratory, University; typically, it will convert from one data representation to another. In general, metamorphisms are less inter before all of the work of the fold is complete. This permits streaming metamorphisms, and among other

  15. We All Stream for Video

    ERIC Educational Resources Information Center

    Technology & Learning, 2008

    2008-01-01

    More than ever, teachers are using digital video to enhance their lessons. In fact, the number of schools using video streaming increased from 30 percent to 45 percent between 2004 and 2006, according to Market Data Retrieval. Why the popularity? For starters, video-streaming products are easy to use. They allow teachers to punctuate lessons with

  16. Industrial-Strength Streaming Video.

    ERIC Educational Resources Information Center

    Avgerakis, George; Waring, Becky

    1997-01-01

    Corporate training, financial services, entertainment, and education are among the top applications for streaming video servers, which send video to the desktop without downloading the whole file to the hard disk, saving time and eliminating copyrights questions. Examines streaming video technology, lists ten tips for better net video, and ranks

  17. Stream processing health card application.

    PubMed

    Polat, Seda; Gndem, Taflan Imre

    2012-10-01

    In this paper, we propose a data stream management system embedded to a smart card for handling and storing user specific summaries of streaming data coming from medical sensor measurements and/or other medical measurements. The data stream management system that we propose for a health card can handle the stream data rates of commonly known medical devices and sensors. It incorporates a type of context awareness feature that acts according to user specific information. The proposed system is cheap and provides security for private data by enhancing the capabilities of smart health cards. The stream data management system is tested on a real smart card using both synthetic and real data. PMID:22127523

  18. FireHose Streaming Benchmarks

    SciTech Connect

    2015-01-27

    The FireHose Streaming Benchmarks are a suite of stream-processing benchmarks defined to enable comparison of streaming software and hardware, both quantitatively vis-a-vis the rate at which they can process data, and qualitatively by judging the effort involved to implement and run the benchmarks. Each benchmark has two parts. The first is a generator which produces and outputs datums at a high rate in a specific format. The second is an analytic which reads the stream of datums and is required to perform a well-defined calculation on the collection of datums, typically to find anomalous datums that have been created in the stream by the generator. The FireHose suite provides code for the generators, sample code for the analytics (which users are free to re-implement in their own custom frameworks), and a precise definition of each benchmark calculation.

  19. Dynamical modeling of tidal streams

    SciTech Connect

    Bovy, Jo

    2014-11-01

    I present a new framework for modeling the dynamics of tidal streams. The framework consists of simple models for the initial action-angle distribution of tidal debris, which can be straightforwardly evolved forward in time. Taking advantage of the essentially one-dimensional nature of tidal streams, the transformation to position-velocity coordinates can be linearized and interpolated near a small number of points along the stream, thus allowing for efficient computations of a stream's properties in observable quantities. I illustrate how to calculate the stream's average location (its 'track') in different coordinate systems, how to quickly estimate the dispersion around its track, and how to draw mock stream data. As a generative model, this framework allows one to compute the full probability distribution function and marginalize over or condition it on certain phase-space dimensions as well as convolve it with observational uncertainties. This will be instrumental in proper data analysis of stream data. In addition to providing a computationally efficient practical tool for modeling the dynamics of tidal streams, the action-angle nature of the framework helps elucidate how the observed width of the stream relates to the velocity dispersion or mass of the progenitor, and how the progenitors of 'orphan' streams could be located. The practical usefulness of the proposed framework crucially depends on the ability to calculate action-angle variables for any orbit in any gravitational potential. A novel method for calculating actions, frequencies, and angles in any static potential using a single orbit integration is described in the Appendix.

  20. GPRS Video Streaming Surveillance System GVSS

    E-print Network

    Pushpavathi, T P; Kumar, N R Shashi

    2010-01-01

    Future security measures will create comfortable living environments that are embedded with a wide range of intelligent functionalities including home computing, entertainment, health care and security. These place stringent requirements on the home networking architecture which integrates various existing technologies for monitoring and control for future high security needs. This paper discusses the design and implementation of a gvss gprs Video Streaming Surveillance System system, which integrates various existing technologies for providing security for smart home environments. This system provides security for office, home and other buildings where high security is required.This allows the mobile user to track the activities from a particular location. The system will send snapshots of the video and stores them in different formats. It is also possible to display the time with the image when it was captured in the gprs enabled mobiles. This system is implemented using J2me Technology

  1. Stream-profile analysis and stream-gradient index

    USGS Publications Warehouse

    Hack, John T.

    1973-01-01

    The generally regular three-dimensional geometry of drainagenetworks is the basis for a simple method of terrain analysisproviding clues to bedrock conditions and other factors that determinetopographic forms. On a reach of any stream, a gradient-index value canbe obtained which allows meaningful comparisons of channel slope onstreams of different sizes. The index is believed to reflect stream poweror competence and is simply the product of the channel slope at a pointand channel length measured along the longest stream above the pointwhere the calculation is made. In an adjusted topography, changes ingradient-index values along a stream generally correspond to differencesin bedrock or introduced load. In any landscape the gradient index of astream is related to total relief and stream regimen. Thus, climate,tectonic events, and geomorphic history must be considered in usingthe gradient index. Gradient-index values can be obtained quickly bysimple measurements on topographic maps, or they can be obtained bymore sophisticated photogrammetric measurements that involve simplecomputer calculations from x, y, z coordinates.

  2. Using Stream Semantics for Continuous Queries in Media Stream Processors Amarnath Gupta

    E-print Network

    Gupta, Amarnath

    Using Stream Semantics for Continuous Queries in Media Stream Processors Amarnath Gupta San Diego a stream query processor capable of handling media (audio, video, mo- tion ...) and feature streams. We and the dependencies among streams. These are expressed using a Media Stream Definition Lan- guage (MSDL). We also show

  3. Choosing a Senior Living Community

    MedlinePLUS

    ... management Personal laundry services Social and recreational activities Checklist for Evaluating Senior Living Communities The downloadable assisted living checklist defines the typical assisted living residence and what ...

  4. Electronic Eye: Streaming Video On-Demand.

    ERIC Educational Resources Information Center

    Meulen, Kathleen

    2002-01-01

    Discusses the use of on-demand streaming video in school libraries. Explains how streaming works, considers advantages and technical issues, and describes products from three companies that are pioneering streaming in the educational video market. (LRW)

  5. Scientific Discovery within Data Streams

    SciTech Connect

    Cowell, Andrew J.; Havre, Susan L.; May, Richard A.; Sanfilippo, Antonio P.

    2005-04-25

    This paper discusses our recent work across a number of disciplines, leading to a concept for a next generation analytical environment for scientific discovery within continuous, time-varying data-streams. First, we have created a stream-processing engine that processes multiple streams of interest. An analyst, via a client interface, reviews the data-stream format and specifies upstream filtering to define stream tokens of interest, leading to a highly specialized collection of time-variant material. We envision using this collection to drive an existing system that visualizes thematic variations over time across a corpus of information. This ThemeRiver helps analysts discern trends, relationships, anomalies, and structure in the data. Further, we make use of a number of technologies that allow us to investigate these elements in ambient environments that surround the user, placing them within their data. We discuss the HI-SPACE (Human Information Space) as a tool for bringing together the most desirable aspects of both physical and electronic information spaces to enhance the ability to interact with information, promote group dialog, and to facilitate group interaction with information to solve complex tasks. Here, we introduce a concept that combines these approaches to produce an advanced analytical environment for data stream analysis that provides a collaborative, ambient environment for scientific discovery in data-streams.

  6. Generation of mock tidal streams

    NASA Astrophysics Data System (ADS)

    Fardal, Mark A.; Huang, Shuiyao; Weinberg, Martin D.

    2015-09-01

    In this paper, we discuss a method for the generation of mock tidal streams. Using an ensemble of simulations in an isochrone potential where the actions and frequencies are known, we derive an empirical recipe for the evolving satellite mass and the corresponding mass-loss rate, and the ejection conditions of the stream material. The resulting stream can then be quickly generated either with direct orbital integration, or by using the action-angle formalism. The model naturally produces streaky features within the stream. These are formed due to the radial oscillation of the progenitor and the bursts of stars emitted near pericentre, rather than clumping at particular oscillation phases as sometimes suggested. When detectable, these streaky features are a reliable diagnostic for the stream's direction of motion and encode other information on the progenitor and its orbit. We show several tests of the recipe in alternate potentials, including a case with a chaotic progenitor orbit which displays a marked effect on the width of the stream. Although the specific ejection recipe may need adjusting when elements such as the orbit or satellite density profile are changed significantly, our examples suggest that model tidal streams can be quickly and accurately generated by models of this general type for use in Bayesian sampling.

  7. MOBILE COLOR BARCODE STREAMING FRAMEWORK JEREMY YANIK

    E-print Network

    ElAarag, Hala

    MOBILE COLOR BARCODE STREAMING FRAMEWORK by JEREMY YANIK Advisor HALA ELAARAG A senior research...............................................................................................................4 3. Mobile Color Barcode Streaming Framework..................................................................................7 Barcode Specification

  8. Cytoplasmic streaming affects gravity-induced amyloplast sedimentation in maize coleoptiles

    NASA Technical Reports Server (NTRS)

    Sack, F. D.; Leopold, A. C.

    1985-01-01

    Living maize (Zea mays L.) coleoptile cells were observed using a horizontal microscope to determine the interaction between cytoplasmic streaming and gravity-induced amyloplast sedimentation. Sedimentation is heavily influenced by streaming which may (1) hasten or slow the velocity of amyloplast movement and (2) displace the plastid laterally or even upwards before or after sedimentation. Amyloplasts may move through transvacuolar strands or through the peripheral cytoplasm which may be divided into fine cytoplasmic strands of much smaller diameter than the plastids. The results indicate that streaming may contribute to the dynamics of graviperception by influencing amyloplast movement.

  9. Composition of saturnian stream particles.

    PubMed

    Kempf, Sascha; Srama, Ralf; Postberg, Frank; Burton, Marcia; Green, Simon F; Helfert, Stefan; Hillier, Jon K; McBride, Neil; McDonnell, J Anthony M; Moragas-Klostermeyer, Georg; Roy, Mou; Grn, Eberhard

    2005-02-25

    During Cassini's approach to Saturn, the Cosmic Dust Analyser (CDA) discovered streams of tiny (less than 20 nanometers) high-velocity (approximately 100 kilometers per second) dust particles escaping from the saturnian system. A fraction of these impactors originated from the outskirts of Saturn's dense A ring. The CDA time-of-flight mass spectrometer recorded 584 mass spectra from the stream particles. The particles consist predominantly of oxygen, silicon, and iron, with some evidence of water ice, ammonium, and perhaps carbon. The stream particles primarily consist of silicate materials, and this implies that the particles are impurities from the icy ring material rather than the ice particles themselves. PMID:15731446

  10. Improving P2P live-content delivery using SVC

    NASA Astrophysics Data System (ADS)

    Schierl, T.; Snchez, Y.; Hellge, C.; Wiegand, T.

    2010-07-01

    P2P content delivery techniques for video transmission have become of high interest in the last years. With the involvement of client into the delivery process, P2P approaches can significantly reduce the load and cost on servers, especially for popular services. However, previous studies have already pointed out the unreliability of P2P-based live streaming approaches due to peer churn, where peers may ungracefully leave the P2P infrastructure, typically an overlay networks. Peers ungracefully leaving the system cause connection losses in the overlay, which require repair operations. During such repair operations, which typically take a few roundtrip times, no data is received from the lost connection. While taking low delay for fast-channel tune-in into account as a key feature for broadcast-like streaming applications, the P2P live streaming approach can only rely on a certain media pre-buffer during such repair operations. In this paper, multi-tree based Application Layer Multicast as a P2P overlay technique for live streaming is considered. The use of Flow Forwarding (FF), a.k.a. Retransmission, or Forward Error Correction (FEC) in combination with Scalable video Coding (SVC) for concealment during overlay repair operations is shown. Furthermore the benefits of using SVC over the use of AVC single layer transmission are presented.

  11. Video streaming into the mainstream.

    PubMed

    Garrison, W

    2001-12-01

    Changes in Internet technology are making possible the delivery of a richer mixture of media through data streaming. High-quality, dynamic content, such as video and audio, can be incorporated into Websites simply, flexibly and interactively. Technologies such as G3 mobile communication, ADSL, cable and satellites enable new ways of delivering medical services, information and learning. Systems such as Quicktime, Windows Media and Real Video provide reliable data streams as video-on-demand and users can tailor the experience to their own interests. The Learning Development Centre at the University of Portsmouth have used streaming technologies together with e-learning tools such as dynamic HTML, Flash, 3D objects and online assessment successfully to deliver on-line course content in economics and earth science. The Lifesign project--to develop, catalogue and stream health sciences media for teaching--is described and future medical applications are discussed. PMID:11802705

  12. Mixing of Supersonic Streams

    NASA Technical Reports Server (NTRS)

    Hawk, C. W.; Landrum, D. B.; Muller, S.; Turner, M.; Parkinson, D.

    1998-01-01

    The Strutjet approach to Rocket Based Combined Cycle (RBCC) propulsion depends upon fuel-rich flows from the rocket nozzles and turbine exhaust products mixing with the ingested air for successful operation in the ramjet and scramjet modes. It is desirable to delay this mixing process in the air-augmented mode of operation present during low speed flight. A model of the Strutjet device has been built and is undergoing test to investigate the mixing of the streams as a function of distance from the Strutjet exit plane during simulated low speed flight conditions. Cold flow testing of a 1/6 scale Strutjet model is underway and nearing completion. Planar Laser Induced Fluorescence (PLIF) diagnostic methods are being employed to observe the mixing of the turbine exhaust gas with the gases from both the primary rockets and the ingested air simulating low speed, air augmented operation of the RBCC. The ratio of the pressure in the turbine exhaust duct to that in the rocket nozzle wall at the point of their intersection is the independent variable in these experiments. Tests were accomplished at values of 1.0, 1.5 and 2.0 for this parameter. Qualitative results illustrate the development of the mixing zone from the exit plane of the model to a distance of about 10 rocket nozzle exit diameters downstream. These data show the mixing to be confined in the vertical plane for all cases, The lateral expansion is more pronounced at a pressure ratio of 1.0 and suggests that mixing with the ingested flow would be likely beginning at a distance of 7 nozzle exit diameters downstream of the nozzle exit plane.

  13. Mixing of Supersonic Streams

    NASA Technical Reports Server (NTRS)

    Hawk, C. W.; Landrum, D. B.; Muller, S.; Turner, M.; Parkinson, D.

    1998-01-01

    The Strutjet approach to Rocket Based Combined Cycle (RBCC) propulsion depends upon fuel-rich flows from the rocket nozzles and turbine exhaust products mixing with the ingested air for successful operation in the ramjet and scramjet modes. It is desirable to delay this mixing process in the air-augmented mode of operation present during low speed flight. A model of the Strutjet device has been built and is undergoing test to investigate the mixing of the streams as a function of distance from the Strutjet exit plane during simulated low speed flight conditions. Cold flow testing of a 1/6 scale Strutjet model is underway and nearing completion. Planar Laser Induced Fluorescence (PLIF) diagnostic methods are being employed to observe the mixing of the turbine exhaust gas with the gases from both the primary rockets and the ingested air simulating low speed, air augmented operation of the RBCC. The ratio of the pressure in the turbine exhaust duct to that in the rocket nozzle wall at the point of their intersection is the independent variable in these experiments. Tests were accomplished at values of 1.0, 1.5 and 2.0 for this parameter. Qualitative results illustrate the development of the mixing zone from the exit plane of the model to a distance of about 19 equivalent rocket nozzle exit diameters downstream. These data show the mixing to be confined in the vertical plane for all cases, The lateral expansion is more pronounced at a pressure ratio of 1.0 and suggests that mixing with the ingested flow would be likely beginning at a distance of 7 nozzle exit diameters downstream of the nozzle exit plane.

  14. Miscellaneous streams best management practices (BMP) report

    SciTech Connect

    Lueck, K.J., Westinghouse Hanford

    1996-07-24

    The Washington State Department of Ecology (Ecology) and U.S. Department of Energy Consent Order No. DE 91NM-177 (Consent Order) lists regulatory milestones for liquid effluent streams at the Hanford Site to comply with the permitting requirements of Washington Administrative Code (WAC) 173-216 (`State Waste Discharge Permit Program`) or WAC 173-218 (`Washington Underground Injection Control Program`) where applicable. Hanford Site liquid effluent streams discharging to the soil column are categorized as Phase I and Phase II Streams, and Miscellaneous Streams. There were originally 33 Phase I and Phase II Streams, however some of these streams have been eliminated. Miscellaneous Streams are those liquid effluent streams discharged to the ground that are not categorized as Phase I or Phase II Streams, and are subject to the requirements of several milestones identified in the Consent Order. The three criteria for identifying streams that are potentially affecting groundwater are: (1) streams discharging to surface contaminated areas (referred to as category `b` streams); (2) potentially contaminated streams (referred to as category `c` streams); and (3) streams discharging within 91 meters (300 feet) of a contaminated crib, ditch, or trench (referred to as category `d` streams). Miscellaneous Streams that meet any of these criteria must be evaluated for application of best management practices (BMP). The purpose of this report is to provide the best management practice preferred alternative. The list of BMP streams has been revised since the original submittal. Several streams from the original list of BMP streams have already been eliminated through facility upgrades, reduction of steam usage, and facility shutdowns. This document contains a description of the changes to the list of BMP streams, applicable definitions and regulatory requirements and possible alternatives, and a schedule for implementing the preferred alternatives.

  15. Is It Living?

    ERIC Educational Resources Information Center

    Keeley, Page

    2011-01-01

    The word "living" is commonly used throughout elementary science lessons that focus on the biological world. It is a word teachers often take for granted when teaching life science concepts. How similar the constructed meaning of a common word like "living" is to the meaning intended by the teacher or instructional materials depends on how a

  16. THE DYNAMICS OF STAR STREAM GAPS

    SciTech Connect

    Carlberg, R. G.

    2013-10-01

    A massive object crossing a narrow stream of stars orbiting in the halo of the galaxy induces velocity changes both along and transverse to the stream that can lead to the development of a visible gap. For a stream narrow relative to its orbital radius, the stream crossing time is sufficiently short that the impact approximation can be used to derive the changes in angular momenta and radial actions along the star stream. The epicyclic approximation is used to calculate the evolution of the density of the stream as it orbits around in a galactic potential. Analytic expressions are available for a point mass, however, the general expressions are easily numerically evaluated for perturbing objects with arbitrary density profiles. With a simple allowance for the velocity dispersion of the stream, moderately warm streams can be modeled. The predicted evolution agrees well with the outcomes of simulations of stellar streams for streams with widths up to 1% of the orbital radius of the stream. The angular momentum distribution within the stream shears out gaps with time, further reducing the visibility of streams, although the size of the shear effect requires more detailed simulations that account for the creation of the stream. An illustrative model indicates that shear will set a lower limit of a few times the stream width for the length of gaps that persist. In general, the equations are useful for dynamical insights into the development of stream gaps and their measurement.

  17. Stream bed organic carbon and biotic integrity.

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Allochthonous organic matter provides a basis for some stream ecosystems. Channel incision, which is a common result of anthropogenic impacts on watersheds and stream channels, may deplete stream bed C stores due to erosion, less frequent hydrologic exchanges between stream and floodplain, and remov...

  18. Extracting Repeats from Media Streams Cormac Herley

    E-print Network

    Herley, Cormac

    Extracting Repeats from Media Streams Cormac Herley Microsoft Research One Microsoft Way Redmond, WA 98052 Email: c.herley@ieee.org Abstract-- Many media streams consist of distinct objects streams. I. INTRODUCTION Rather than having infinite innovation many media streams are quite repetitive

  19. Outlier Detection With Streaming Dyadic Decomposition

    E-print Network

    Grossman, Robert

    Outlier Detection With Streaming Dyadic Decomposition Chetan Gupta1,2 and Robert Grossman1,3 1- liers on streaming data in Rn . The basic idea is to compute a dyadic decomposition into cubes in Rn. Dyadic decomposition obtained under streaming setting is understood as streaming dyadic decomposition

  20. Unique Challenges to (Federal) Enterprise Streaming

    NASA Technical Reports Server (NTRS)

    Walls, Bryan

    2006-01-01

    Enterprise streaming has different parameters than consumer Streaming. The government enterprise has some differences on top of that. I'd like to highlight some issues shared by the Federal government as a whole, with a closer look at streaming within NASA. Then we'll look at NASA's strategy for streaming.

  1. Stream Differential Equations: Specification Formats and Solution Methods

    E-print Network

    Rutten, Jan

    Stream Differential Equations: Specification Formats and Solution Methods Helle Hvid Hansen Clemens. Stream differential equations are a coinductive method for specifying streams and stream operations differential equations, their solution methods, and the classes of streams they can define. Moreover, we

  2. Living alone with dementia.

    PubMed

    Duane, Fleur; Brasher, Kathleen; Koch, Susan

    2013-01-01

    This paper details the findings of an exploratory study undertaken in 2009 into the older population who live alone with dementia, as part of a wider study into the phenomenon of living alone in older age with a cognitive impairment or early stage dementia. Interviews were undertaken with 19 older people who live alone with cognitive impairment or early stage dementia, and field notes were taken during interview visits. Throughout this paper, older people who live alone with a cognitive impairment or dementia who participated in the study will be referred to by pseudonym. Overall, the findings give insight into the lives of these people and how they remain connected to and supported by others. These findings will contribute to the knowledge of this group, which may be considered in future research and service delivery. PMID:24336667

  3. Fuel-cell engine stream conditioning system

    DOEpatents

    DuBose, Ronald Arthur (Marietta, GA)

    2002-01-01

    A stream conditioning system for a fuel cell gas management system or fuel cell engine. The stream conditioning system manages species potential in at least one fuel cell reactant stream. A species transfer device is located in the path of at least one reactant stream of a fuel cell's inlet or outlet, which transfer device conditions that stream to improve the efficiency of the fuel cell. The species transfer device incorporates an exchange media and a sorbent. The fuel cell gas management system can include a cathode loop with the stream conditioning system transferring latent and sensible heat from an exhaust stream to the cathode inlet stream of the fuel cell; an anode humidity retention system for maintaining the total enthalpy of the anode stream exiting the fuel cell related to the total enthalpy of the anode inlet stream; and a cooling water management system having segregated deionized water and cooling water loops interconnected by means of a brazed plate heat exchanger.

  4. Influence of Stream Discharge on Reproductive Success of a Prairie Stream Fish Assemblage

    E-print Network

    Wilde, Gene

    Influence of Stream Discharge on Reproductive Success of a Prairie Stream Fish Assemblage BART W and reproductive success for five members of a prairie stream fish assemblage. Based on information obtained from for successful reproduction of prairie stream cyprinids than the magnitude of discharge. Stream discharge

  5. Optimal Server Bandwidth Allocation for Streaming Multiple Streams via P2P Multicast

    E-print Network

    Girod, Bernd

    Optimal Server Bandwidth Allocation for Streaming Multiple Streams via P2P Multicast Aditya}@stanford.edu Abstract--We consider the general scenario where content hosted by the server comprises streams and each peer can subscribe one or more streams. Multiple multicast trees are built to deliver the streams

  6. IN-STREAM DENITRIFICATION: PILOT STUDIES AND SITE CHARACTERISTICS ON A HEADWATER STREAM

    E-print Network

    Gold, Art

    IN-STREAM DENITRIFICATION: PILOT STUDIES AND SITE CHARACTERISTICS ON A HEADWATER STREAM BY ALISON J the landscape. Headwater streams can generate substantial N processing; however, several studies have observed minimal N retention within-streams. We assessed the reach-scale in-stream N removal and denitrification

  7. Where the Hippopotamus Lives.

    ERIC Educational Resources Information Center

    Richard, Don

    1983-01-01

    During their environmental education year, 12-year-old students from Treverton Preparatory School (Natal, South Africa) learn all subjects in an environmental manner. The central theme streaming through the internationally recognized program is the Mooi River. A three-day camping trip and other outdoor activities are included. (MH)

  8. Streaming Compression of Hexahedral Meshes

    SciTech Connect

    Isenburg, M; Courbet, C

    2010-02-03

    We describe a method for streaming compression of hexahedral meshes. Given an interleaved stream of vertices and hexahedral our coder incrementally compresses the mesh in the presented order. Our coder is extremely memory efficient when the input stream documents when vertices are referenced for the last time (i.e. when it contains topological finalization tags). Our coder then continuously releases and reuses data structures that no longer contribute to compressing the remainder of the stream. This means in practice that our coder has only a small fraction of the whole mesh in memory at any time. We can therefore compress very large meshes - even meshes that do not file in memory. Compared to traditional, non-streaming approaches that load the entire mesh and globally reorder it during compression, our algorithm trades a less compact compressed representation for significant gains in speed, memory, and I/O efficiency. For example, on the 456k hexahedra 'blade' mesh, our coder is twice as fast and uses 88 times less memory (only 3.1 MB) with the compressed file increasing about 3% in size. We also present the first scheme for predictive compression of properties associated with hexahedral cells.

  9. Petroleum stream microwave watercut monitor

    SciTech Connect

    Helms, D.A.; Marrelli, J.D.

    1990-08-07

    This patent describes a petroleum stream microwave watercut monitor. It comprises: test cell means for having a petroleum stream flowing through it while permitting microwave energy to enter the test cell means; source means for transmitting microwave energy, antenna means for irradiating the stream flowing in the test cell means with microwave energy and for receiving reflected microwave energy back from the stream in the test cell means, isolator means connected to the antenna means for passing microwave energy to and from the antenna means while isolating the antenna means from extraneous energies that may arise in the water cut monitor so as to prevent an accidental explosion due to those extraneous energies, circulating means connected to the source means and to the isolator means for providing the microwave energy from the source means to the antenna means through the isolator means and for providing reflected microwave energy from the antenna means by way of the isolator means to be provided as test microwave energy, and indicator means for providing an indication of the watercut of the petroleum stream.

  10. Abstract--Adaptive video streaming over HTTP is fast becoming a preferred way for delivering on-demand as well as

    E-print Network

    Kalva, Hari

    -demand as well as live video service. The MPEG committee is finalizing a standard for Dynamic Adaptive Streaming bitrate and the underlying network has to guarantee certain level of service, video services over HTTP use) as is necessary in services such as broadcasting and realtime video streaming. The duration of segments used

  11. Cytoplasmic streaming in plant cells: the role of wall slip

    E-print Network

    Wolff, K; Cates, M E

    2012-01-01

    We present a computer simulation study, via lattice Boltzmann simulations, of a microscopic model for cytoplasmic streaming in algal cells such as those of Chara corallina. We modelled myosin motors tracking along actin lanes as spheres undergoing directed motion along fixed lines. The sphere dimension takes into account the fact that motors drag vesicles or other organelles, and, unlike previous work, we model the boundary close to which the motors move as walls with a finite slip layer. By using realistic parameter values for actin lane and myosin density, as well as for endoplasmic and vacuole viscosity and the slip layer close to the wall, we find that this simplified view, which does not rely on any coupling between motors, cytoplasm and vacuole other than that provided by viscous Stokes flow, is enough to account for the observed magnitude of streaming velocities in intracellular fluid in living plant cells.

  12. GLOBULAR CLUSTERS AND DARK SATELLITE GALAXIES THROUGH THE STREAM VELOCITY

    SciTech Connect

    Naoz, Smadar; Narayan, Ramesh

    2014-08-10

    The formation of purely baryonic globular clusters with no gravitationally bound dark matter is still a theoretical challenge. We show that these objects might form naturally whenever there is a relative stream velocity between baryons and dark matter. The stream velocity causes a phase shift between linear modes of baryonic and dark matter perturbations, which translates to a spatial offset between the two components when they collapse. For a 2? (3?) density fluctuation, baryonic clumps with masses in the range 10{sup 5}-2.5 10{sup 6}M {sub ?} (10{sup 5}-4 10{sup 6}M {sub ?}) collapse outside the virial radii of their counterpart dark matter halos. These objects could survive as long-lived, dark-matter-free objects and might conceivably become globular clusters. In addition, their dark matter counterparts, which were deprived of gas, might become dark satellite galaxies.

  13. Cytoplasmic streaming in plant cells: the role of wall slip

    E-print Network

    K. Wolff; D. Marenduzzo; M. E. Cates

    2012-02-29

    We present a computer simulation study, via lattice Boltzmann simulations, of a microscopic model for cytoplasmic streaming in algal cells such as those of Chara corallina. We modelled myosin motors tracking along actin lanes as spheres undergoing directed motion along fixed lines. The sphere dimension takes into account the fact that motors drag vesicles or other organelles, and, unlike previous work, we model the boundary close to which the motors move as walls with a finite slip layer. By using realistic parameter values for actin lane and myosin density, as well as for endoplasmic and vacuole viscosity and the slip layer close to the wall, we find that this simplified view, which does not rely on any coupling between motors, cytoplasm and vacuole other than that provided by viscous Stokes flow, is enough to account for the observed magnitude of streaming velocities in intracellular fluid in living plant cells.

  14. The role of red alder in riparian forest structure along headwater streams in southeastern Alaska

    USGS Publications Warehouse

    Orlikowska, E.H.; Deal, R.L.; Hennon, P.E.; Wipfli, M.S.

    2004-01-01

    We assessed the influence of red alder on tree species composition, stand density, tree size distribution, tree mortality, and potential for producing large conifers, in 38-42 yr old riparian forests along 13 headwater streams in the Maybeso and Harris watersheds on Prince of Wales Island, Alaska. Red alder ranged from 0 to 53% of the total live basal area of the stands. Tree density, basal area of live and dead trees, and mean diameter of live conifers were not significantly related to the percent of alder as a proportion of total stand live basal area within these riparian forests. The mean diameter of the 100 largest conifers per hectare (the largest trees) was similar among different sites and appeared unrelated to the amount of alder in the stands. The mean diameter of dead conifers increased slightly with increasing proportion of red alder. Most dead trees were small and died standing. Red alder was much more concentrated immediately along stream margins (within 0-1 m distance from the stream bank vs. > 1 m). The presence of red alder did not inhibit the production of large-diameter conifers, and both alder and conifers provided small woody debris for fishless headwater streams in southeastern Alaska. Red alder is an important structural component of young-growth riparian stands.

  15. Peer-to-Peer Streaming of Layered Video: Efficiency, Fairness and Incentive

    E-print Network

    Liu, Yong

    on the Internet. It has attracted sub- stantial attentions in research community and industry. Several widely deployed commercial P2P live streaming systems [1] [3] routinely attract hundreds of thousands of users, the notion of fairness is much more subtle than that in the traditional server- client systems, where clients

  16. MEASUREMENT OF THE CONGESTION RESPONSIVENESS OF REALPLAYER STREAMING VIDEO OVER UDP

    E-print Network

    Claypool, Mark

    streaming videos of news broadcasts, music television, live sporting events and more. For exam ple, in 2001Friendliness of RealVideo over UDP and correlate the results with network and application layer statistics. We find , broadcast quality videos at about 24 Mbps 3 , studio quality videos at about 36 Mbps 3 , and HDTV quality

  17. Empirical Evaluation of the Congestion Responsiveness of RealPlayer Video Streams

    E-print Network

    Claypool, Mark

    ondemand. Web sites today offer streaming videos of news broadcasts, music television, live sporting. In this work, we evaluate the responsiveness of RealNetworks' RealVideo over UDP by measuring the per formance at about 0.1 Mbps 1 , VCR qual ity videos at about 1.2 Mbps 2 , broadcast quality videos at about 24 Mbps

  18. Perturbing Streaming in Dictyostelium Discoideum

    NASA Astrophysics Data System (ADS)

    McCann, Colin; Kriebel, Paul; Parent, Carole; Rericha, Erin; Losert, Wolfgang

    2007-03-01

    Upon starvation the social amoebae Dictyostelium discoideum aggregate to form multicellular organisms. During the transition from single cells to full aggregates, cells relay the chemotactic signal, align in a head-to-tail fashion, and follow each other in streams. To gain more insight into streaming behavior we investigated its robustness by perturbing the strength of the relayed chemoattractant. We measured the effects of plating the cells at varying densities, placing them in excess extracellular fluid thereby diluting cell-cell signals, or directly mixing up the local external fluid using ultrasound-induced bubble-driven flow. We compared wild type cells to cells devoid of signal relay and measured how streaming affects cell speed, directionality, and extent of directed migration. Results will be discussed and a model describing our findings will be presented.

  19. A Robust Streaming Media System

    NASA Astrophysics Data System (ADS)

    Youwei, Zhang

    Presently, application layer multicast protocols (ALM) are proposed as substitute for IP multicast and have made extraordinary achievements. Integrated with Multi-data-stream mode such as Multiple Description Coding (MDC), ALM becomes more scalable and robust in high-dynamic Internet environment compared with single data stream. Although MDC can provide a flexible data transmission style, the synchronization of different descriptions encoded from one video source is proved to be difficult due to different delay on diverse transmission paths. In this paper, an ALM system called HMDC is proposed to improve accepted video quality of streaming media, hosts can join the separate overlay trees in different layers simultaneously, then the maximum synchronized descriptions of the same layer are worked out to acquire the best video quality. Simulations implemented on Internet-like topology indicate that HMDC achieves better video quality, lower link stress, higher robustness and comparable latency compared with traditional ALM protocols.

  20. Fluorescence Live Cell Imaging

    PubMed Central

    Ettinger, Andreas

    2014-01-01

    Fluorescence microscopy of live cells has become an integral part of modern cell biology. Fluorescent protein tags, live cell dyes, and other methods to fluorescently label proteins of interest provide a range of tools to investigate virtually any cellular process under the microscope. The two main experimental challenges in collecting meaningful live cell microscopy data are to minimize photodamage while retaining a useful signal-to-noise ratio, and to provide a suitable environment for cells or tissues to replicate physiological cell dynamics. This chapter aims to give a general overview on microscope design choices critical for fluorescence live cell imaging that apply to most fluorescence microscopy modalities, and on environmental control with a focus on mammalian tissue culture cells. In addition, we provide guidance on how to design and evaluate fluorescent protein constructs by spinning disk confocal microscopy. PMID:24974023

  1. Living With Lupus

    MedlinePLUS

    ... Information Lupus Find a Clinical Trial Journal Articles Lupus July 2014 Living With Lupus: Health Information Basics for You and Your Family ... If You Have Lupus? Symptom Checklist What Is Lupus? Lupus is an autoimmune (AW-toe-ih-MYOON) ...

  2. Living with uterine fibroids

    MedlinePLUS

    Learning how to manage your symptoms can make it easier to live with fibroids. Apply a hot ... relax and help relieve pain include: Muscle relaxation Deep breathing Visualization Biofeedback Yoga Some women find that ...

  3. Living with Parkinson's

    MedlinePLUS

    ... maintain the highest quality of daily living with Parkinson's disease. Performing activities that may benefit you and your symptoms painting, tai-chi, exercise to take charge of your life with PD. ...

  4. Living with Advanced MS

    MedlinePLUS

    ... manage the challenges they face. Planning for the future Although MS is a progressive disease for many ... and your family plan more effectively for the future. Identifying options The key message to anyone living ...

  5. Living with Hearing Loss

    MedlinePLUS

    ... Current Issue Past Issues Special Section: Focus on Communication Living with Hearing Loss Past Issues / Fall 2008 ... the United States suffer some form of disordered communication. The National Institute on Deafness and Other Communication ...

  6. The Living Cosmos

    NASA Astrophysics Data System (ADS)

    Impey, Chris

    2011-06-01

    Preface; 1. The unfinished revolution; 2. Life's origins; 3. Extreme life; 4. Shaping evolution; 5. Living in the Solar System; 6. Distant worlds; 7. Are we alone?; Notes; Glossary; Reading list; Media resources; Illustration credits; Index.

  7. Living with Thrombocytopenia

    MedlinePLUS

    ... page from the NHLBI on Twitter. Living With Thrombocytopenia If you have thrombocytopenia, watch for any signs and symptoms of bleeding. ... Symptoms can appear suddenly or over time. Severe thrombocytopenia can cause bleeding in almost any part of ...

  8. Living with Pulmonary Hypertension

    MedlinePLUS

    ... on Twitter. Living With Pulmonary Hypertension Pulmonary hypertension (PH) has no cure. However, you can work with ... your doctor advises. Call your doctor if your PH symptoms worsen or change. The earlier symptoms are ...

  9. Living with Atherosclerosis

    MedlinePLUS

    ... page from the NHLBI on Twitter. Living With Atherosclerosis Improved treatments have reduced the number of deaths ... Rate This Content: NEXT >> Featured Video What is atherosclerosis? 05/22/2014 Describes how the build-up ...

  10. Visualizing a Living Building

    E-print Network

    Padget, Steve

    2013-01-01

    Triple Bottom Line thinking, an Integrated Design Process and Life Cycle Analysis. The author, a member of the design team, will focus on the variety of representation techniques used and their roles within this design process pursuing Living Building...

  11. Living with Thalassemias

    MedlinePLUS

    ... page from the NHLBI on Twitter. Living With Thalassemias Survival and quality of life have improved for people who have moderate or severe thalassemias. This is because: More people are able to ...

  12. Influenza Vaccine, Live Intranasal

    MedlinePLUS

    ... at http://www.cdc.gov/flu Live Attenuated Influenza Vaccine Information Statement. U.S. Department of Health and Human Services/Centers for Disease Control and Prevention National Immunization Program. 8/7/2015.

  13. ASHRAE's Living Laboratory

    SciTech Connect

    Jarnagin, Ronald E.; Brambley, Michael R.

    2008-10-01

    ASHRAE recently remodeled its headquarters building in Atlanta with the intention of making the building a LEED Gold building. As part of that renovation the building was enhanced with additional sensors and monitoring equipment to allow it to serve as a Living Laboratory for use by members and the general public to study the detailed energy use and performance of buildings. This article provides an overview of the Living Laboratory and its capabilities.

  14. Next Generation Living

    E-print Network

    Vaughn, Caroline Elizabeth

    2013-02-06

    GENERATION LIVING An Undergraduate Research Scholars Thesis By CAROLINE VAUGHN AND MISAEL GONZALEZ Submitted to Honors and Undergraduate Research Texas A&M University in partial fulfillment of the requirements for the designation...?????????????????????????????......30 2 ABSTRACT Next Generation Living (May 2013) Caroline Vaughn and Misael Gonzalez Department of Architecture Texas A&M University Research Advisor: Dr. Charles H. Culp Department of Architecture The idea...

  15. Temperature of the Gulf Stream

    NASA Technical Reports Server (NTRS)

    2002-01-01

    The Gulf Stream is one of the strong ocean currents that carries warm water from the sunny tropics to higher latitudes. The current stretches from the Gulf of Mexico up the East Coast of the United States, departs from North America south of the Chesapeake Bay, and heads across the Atlantic to the British Isles. The water within the Gulf Stream moves at the stately pace of 4 miles per hour. Even though the current cools as the water travels thousands of miles, it remains strong enough to moderate the Northern European climate. The image above was derived from the infrared measurements of the Moderate-resolution Imaging Spectroradiometer (MODIS) on a nearly cloud-free day over the east coast of the United States. The coldest waters are shown as purple, with blue, green, yellow, and red representing progressively warmer water. Temperatures range from about 7 to 22 degrees Celsius. The core of the Gulf Stream is very apparent as the warmest water, dark red. It departs from the coast at Cape Hatteras, North Carolina. The cool, shelf water from the north entrains the warmer outflows from the Chesapeake and Delaware Bays. The north wall of the Gulf Stream reveals very complex structure associated with frontal instabilities that lead to exchanges between the Gulf Stream and inshore waters. Several clockwise-rotating warm core eddies are evident north of the core of the Gulf Stream, which enhance the exchange of heat and water between the coastal and deep ocean. Cold core eddies, which rotate counter clockwise, are seen south of the Gulf Stream. The one closest to Cape Hatteras is entraining very warm Gulf Stream waters on its northwest circumference. Near the coast, shallower waters have warmed due to solar heating, while the deeper waters offshore are markedly cooler (dark blue). MODIS made this observation on May 8, 2000, at 11:45 a.m. EDT. For more information, see the MODIS-Ocean web page. The sea surface temperature image was created at the University of Miami using the 11- and 12-micron bands, by Bob Evans, Peter Minnett, and co-workers.

  16. Ecology Lab! Biol 251: Stream Diversity STREAM DIVERSITY

    E-print Network

    Farnsworth, George - Department of Biology, Xavier University

    in the adult form flying along streams and rivers in the summer. In contrast, true bugs begin life in the water with the unaided eye. Most benthic macroinvertebrates in flowing water are aquatic insects or the aquatic stages organisms make them useful indicators of water quality: 1. Many are sensitive to physical and chemical

  17. Assisted Living State Regulatory Review

    MedlinePLUS

    ... Periodicals State Regulatory Review Webinars Assisted Living State Regulatory Review Page Content NCAL will not be publishing ... provided on the NCAL website. Assisted Living State Regulatory Reviews 2013 Assisted Living State Regulatory Review 2012 ...

  18. Video Streaming in Online Learning

    ERIC Educational Resources Information Center

    Hartsell, Taralynn; Yuen, Steve Chi-Yin

    2006-01-01

    The use of video in teaching and learning is a common practice in education today. As learning online becomes more of a common practice in education, streaming video and audio will play a bigger role in delivering course materials to online learners. This form of technology brings courses alive by allowing online learners to use their visual and

  19. Keeping Livestock Out of Streams

    E-print Network

    Radcliffe, David

    . Federal Regulations Governing Nonpoint Source Pollution........................................3 A. Clean Division, Non-Point Source Program. For more information about the IWE, contact: Christine Rodick, Project having access to streams is a common nonpoint source of fecal coliform bacteria. The U.S. Environmental

  20. ALIENS IN WESTERN STREAM ECOSYSTEMS

    EPA Science Inventory

    The USEPA's Environmental Monitoring and Assessment Program conducted a five year probability sample of permanent mapped streams in 12 western US states. The study design enables us to determine the extent of selected riparian invasive plants, alien aquatic vertebrates, and some ...

  1. Molten Rock Streaming into Water

    USGS Multimedia Gallery

    The molten rock streams through an opening in the melter into a large container of water below, where it instantly cools into glass. __________ The USGS has created man-made moon dirt, or regolith, to help NASA prepare for upcoming moon explorations. Four tons of the simulant is expected to be mad...

  2. Pierre Y. Julien Stream Rehabilitation

    E-print Network

    Julien, Pierre Y.

    and examine future changes. Protect Levee Create a Functioning Floodplain Improve Wildlife Habitat Rio at the geology, deforestation, land use changes, urbanization, climate and extreme events. Examine water need to be effective, environmentally acceptable and economical. Three Laws of Stream Restoration

  3. POPULATION DECLINE IN STREAM FISH

    EPA Science Inventory

    Over half of the streams in the Mid-Atlantic Highlands have fish communities that are in fair or poor condition, and the EPA concluded that physical habitat alteration represents the greatest potential stressor across this region. A quantitative method for relating habitat quali...

  4. Oxygen Sag and Stream Purification.

    ERIC Educational Resources Information Center

    Neal, Larry; Herwig, Roy

    1978-01-01

    Presents a literature review of water quality related to oxygen sag and stream purification, covering publications of 1976-77. This review includes: (1) self-purification models; (2) oxygen demand; and (3) reaeration and oxygen transfer. A list of 60 references is also presented. (HM)

  5. NATIONAL STREAM SURVEY DATABASE GUIDE

    EPA Science Inventory

    The National Stream Survey (NSS), conducted in the spring of 1985 and 1986, is one component of the U.S Environmental Protection Agency's National Surface Water Survey. This effort is in support of the National Acid Precipitation Assessment Program. he NSS was a synoptic, spring ...

  6. Aeroacoustics of Three-Stream Jets

    NASA Technical Reports Server (NTRS)

    Henderson, Brenda S.

    2012-01-01

    Results from acoustic measurements of noise radiated from a heated, three-stream, co-annular exhaust system operated at subsonic conditions are presented. The experiments were conducted for a range of core, bypass, and tertiary stream temperatures and pressures. The nozzle system had a fan-to-core area ratio of 2.92 and a tertiary-to-core area ratio of 0.96. The impact of introducing a third stream on the radiated noise for third-stream velocities below that of the bypass stream was to reduce high frequency noise levels at broadside and peak jet-noise angles. Mid-frequency noise radiation at aft observation angles was impacted by the conditions of the third stream. The core velocity had the greatest impact on peak noise levels and the bypass-to-core mass flow ratio had a slight impact on levels in the peak jet-noise direction. The third-stream jet conditions had no impact on peak noise levels. Introduction of a third jet stream in the presence of a simulated forward-flight stream limits the impact of the third stream on radiated noise. For equivalent ideal thrust conditions, two-stream and three-stream jets can produce similar acoustic spectra although high-frequency noise levels tend to be lower for the three-stream jet.

  7. Effects of Stream Channel Characteristics on Nitrate Delivery to Streams and In-Stream Denitrification Rates, Raccoon River, Iowa

    NASA Astrophysics Data System (ADS)

    Prestegaard, K. L.; O'Connell, M.

    2004-05-01

    Streams in agricultural areas often exhibit significant channel and sediment modifications; they are often incised and transport more fine sediment than non-agricultural streams. These channel characteristics can influence stream water quality by modifying surface-groundwater interactions. In the Raccoon River basin, channel incision increases the delivery of nitrate from the groundwater to the streams. The sandy in-stream sediments, however, serve as very effective sites for in-stream denitrification. Nitrate delivery and in-stream denitrification was examined in 3 subwatersheds of the Raccoon River. Stream morphology, water quality, and sediment characteristics were measured at 35 sites with varying land uses. Headwater stream nitrate concentration increased with percent row crops and the amount of channel incision. Downstream sites showed a wide variation in nitrate concentration with land use. Stream nitrate concentrations were measured at 6 sites in each of 3 streams with high percentages of row crop land uses during high summer baseflow following the 1993 floods and during average summer baseflow in 1995. Nitrate concentrations were systematically higher for the high baseflow conditions of 1993 than the average year (1995). This change in nitrate concentration is interpreted as the increased effectiveness of nitrate delivery to the stream during periods of high water tables. The effect was most pronounced in incised reaches. All 3 streams show downstream decreases in nitrate concentration. Water samples for all the sites in the watersheds were analyzed for nitrogen isotopic composition. The nitrogen isotopic composition shifts with towards higher d 15N values with decreasing nitrate concentration. This is consistent with denitrification reactions that selectively remove the 14N leaving a higher proportion of 15N in the nitrate. This suggests that most of the downstream decrease in nitrate concentrations is a result of in-stream denitrification. The high rates of in-stream denitrification might be a consequence of thick, sandy, carbon-rich stream sediments, which are themselves a consequence of agricultural erosion and deposition.

  8. Effect of land use on the composition, diversity and abundance of insects drifting in neotropical streams.

    PubMed

    Gimenez, B C G; Lansac-Tha, F A; Higuti, J

    2015-11-01

    Streams may exhibit differences in community structure of invertebrate drift, which may be a reflex of variation in environmental factors, able to change in conditions of anthropogenic interventions. The aim of this study was to analyze the composition, diversity and abundance of insects drifting in two neotropical streams under different land use and to identify the environmental factors involved in determining such patterns. 54 taxa of aquatic insects were identified in urban and rural streams. The results indicated significant differences in species composition due to the replacement of specialist species by generalist species in the urban stream. Higher diversity of taxa was recorded in the rural stream, with high levels of dissolved oxygen and high water flow, which favored the occurrence of sensitive groups to environmental disturbances, such as Ephemeroptera, Plecoptera, Trichoptera and Coleoptera taxa, that living mainly in clean and well oxygenated waters. On the other hand, a higher density of insects drifting, especially Chironomidae, was observed in the urban stream, where high values of pH, electrical conductivity and nitrogen were observed. These larvae are able to explore a wide range of environmental conditions, owing to their great capacity for physiological adaptation. Despite observing the expected patterns, there were no significant differences between streams for the diversity and abundance of species. Thus, the species composition can be considered as the best predictor of impacts on the drifting insect community. PMID:26602342

  9. COMMUNITY PHOTOSYNTHESIS AND RESPIRATION IN EXPERIMENTAL STREAMS

    EPA Science Inventory

    Changes in relative contribution to total stream photosynthetic and respiratory rates by various community components of an open channel stream were estimated. Rates of photosynthetic production of plankton, benthos and macrophytes (with associated epiphytes) were followed throug...

  10. Language and compiler support for stream programs

    E-print Network

    Thies, William Frederick, 1978-

    2009-01-01

    Stream programs represent an important class of high-performance computations. Defined by their regular processing of sequences of data, stream programs appear most commonly in the context of audio, video, and digital ...

  11. Efficient stream distributions in radiative transfer theory

    NASA Technical Reports Server (NTRS)

    Whitney, C.

    1974-01-01

    This paper discusses a new, computationally-efficient method for approximating the integro-differential equation of radiative transfer with a finite set of coupled differential equations for discrete streams. The method uses recommended spatial distributions of streams that are quite different from those typically used in that they are based on the symmetry of several regular Platonic solids. To facilitate the use of such distributions, an explicit, one-parameter relationship between the physical radiance and the abstract stream is formulated. The parameter is used to determine the minimum number of streams required in the radiative transfer model. Accuracy and computational efficiency are shown to be served best by choosing a stream distribution that is invariant to a large number of three space rotations. For various values of the above-mentioned parameter, the resulting recommended stream distribution is shown to be more computationally efficient than more conventional stream distributions. Finally, the incorporation of polarization in the stream definition is described.

  12. Cryosphere: Order in Antarctic ice streams

    NASA Astrophysics Data System (ADS)

    Sergienko, O. V.

    2015-11-01

    Ice streams transport ice rapidly from the interior of the Antarctic ice sheet to the coast. An analysis of surface flow convergence suggests that ice flow and geometry are intricately linked within these ice streams.

  13. Characterizing Perceptual Artifacts in Compressed Video Streams

    E-print Network

    Wang, Zhou

    Characterizing Perceptual Artifacts in Compressed Video Streams Kai Zeng, Tiesong Zhao, Abdul important roles in the development of effective video compression, streaming and quality enhancement systems of novel coding structures and strategies during the development of new video compression standards

  14. Stream Tables and Watershed Geomorphology Education.

    ERIC Educational Resources Information Center

    Lillquist, Karl D.; Kinner, Patricia W.

    2002-01-01

    Reviews copious stream tables and provides a watershed approach to stream table exercises. Results suggest that this approach to learning the concepts of fluvial geomorphology is effective. (Contains 39 references.) (DDR)

  15. Stream-based statistical machine translation

    E-print Network

    Levenberg, Abby D.

    2011-11-24

    We investigate a new approach for SMT system training within the streaming model of computation. We develop and test incrementally retrainable models which, given an incoming stream of new data, can efficiently incorporate ...

  16. Time of travel of selected Arkansas streams

    USGS Publications Warehouse

    Lamb, T.E.

    1982-01-01

    Between 1971 and 1981, time-of-travel and dispersion measurements were made in 15 streams in Arkansas. Most of the streams studied were at or near base flow. Graphs are presented for predicting traveltime of solutes in segments of the streams studied. The relationship of time of passage and peak unit concentration to traveltime is presented for two of the streams. Examples of use and application of the data are given. (USGS)

  17. Living My Family's Story

    PubMed Central

    Underhill, Meghan L.; Lally, Robin M.; Kiviniemi, Marc T.; Murekeyisoni, Christine; Dickerson, Suzanne S.

    2013-01-01

    Background Based on known or suggested genetic risk factors, a growing number of women now live with knowledge of a potential cancer diagnosis that may never occur. Given this, it is important to understand the meaning of living with high risk for hereditary breast cancer. Objective The objective of the study was to explore how women at high risk for hereditary breast cancer (1) form self-identity, (2) apply self-care strategies toward risk, and (3) describe the meaning of care through a high-risk breast program. Methods Interpretive hermeneutic phenomenology guided the qualitative research method. Women at high risk for hereditary breast cancer were recruited from a high-risk breast program. Open-ended interview questions focused on experiences living as women managing high risk for breast cancer. Consistent with hermeneutic methodology, the principal investigator led a team to analyze the interview transcripts. Results Twenty women participated in in-depth interviews. Analysis revealed that women describe their own identity based on their family story and grieve over actual and potential familial loss. This experience influences self-care strategies, including seeking care from hereditary breast cancer risk experts for early detection and prevention, as well as maintaining a connection for early treatment when diagnosis occurs. Conclusions Healthy women living with high risk for hereditary breast cancer are living within the context of their family cancer story, which influences how they define themselves and engage in self-care. Implications for Practice Findings present important practical, research, and policy information regarding health promotion, psychosocial assessment, and support for women living with this risk. PMID:22544165

  18. Cryopreservation of Living Organs

    NASA Astrophysics Data System (ADS)

    Tanasawa, Ichiro; Nagata, Shinichi; Kimura, Naohiro

    Cryopreservation is considered to be the most promising way of preserving living organs or tissues for a long period of time without casuing any damage to their biological functions. However, cryopreservation has been succeeded only for simple and small-size tissues such as spermatozoon, ovum, erythrocyte, bone marrow and cornea. Cryopreservation of more complex and large-scale organs are not yet succssful. The authors have attempted to establish a technique for cryopreservation of larger living organs. An experiment was carried out using daphnia (water flea). The optimum rates of freezing and thawing were determined together with the optimum selection of cryoprotectant. High recovery rate was achieved under these conditions.

  19. Flow effects on benthic stream invertebrates and ecological processes

    NASA Astrophysics Data System (ADS)

    Koprivsek, Maja; Brilly, Mitja

    2010-05-01

    Flow is the main abiotic factor in the streams. Flow affects the organisms in many direct and indirect ways. The organisms are directly affected by various hydrodynamic forces and mass transfer processes like drag forces, drift, shear stress, food and gases supply and washing metabolites away. Indirect effects on the organisms are determining and distribution of the particle size and structure of the substrate and determining the morphology of riverbeds. Flow does not affect only on individual organism, but also on many ecological effects. To expose just the most important: dispersal of the organisms, habitat use, resource acquisition, competition and predator-prey interactions. Stream invertebrates are adapted to the various flow conditions in many kinds of way. Some of them are avoiding the high flow with living in a hyporeic zone, while the others are adapted to flow with physical adaptations (the way of feeding, respiration, osmoregulation and resistance to draught), morphological adaptations (dorsoventrally flattened shape of organism, streamlined shape of organism, heterogeneous suckers, silk, claws, swimming hair, bristles and ballast gravel) or with behaviour. As the flow characteristics in a particular stream vary over a broad range of space and time scales, it is necessary to measure accurately the velocity in places where the organisms are present to determine the actual impact of flow on aquatic organisms. By measuring the mean flow at individual vertical in a single cross-section, we cannot get any information about the velocity situation close to the bottom of the riverbed where the stream invertebrates are living. Just measuring the velocity near the bottom is a major problem, as technologies for measuring the velocity and flow of natural watercourses is not adapted to measure so close to the bottom. New researches in the last two decades has shown that the thickness of laminar border layer of stones in the stream is only a few 100 micrometers, what is not enough to make a shelter for stream invertebrates. It serves as a shelter only for microorganisms, but the stream invertebrates have to avoid the swift flow or adapt to flow with adaptations described above. To understand what conditions are subject to aquatic organisms and how to adapt, it is essential. Both, knowledge of fluid dynamics in natural watercourses and ecology are needed to understand to what conditions the stream invertebrates are exposed and how they cope with them. Some investigations of near bed flow will be performed on the Glinica stream. The acoustic Doppler velocimeter SonTek will be adapted to measure so close to the bed as possible. It is expected we should be able to measure the velocities just 0,5 cm above the bed surface. We intend to measure the velocities on a natural and on a regulated reach and then compare the results.

  20. Virginia Trout Stream Sensitivity Study 2010 Survey

    E-print Network

    Lawrence, Deborah

    Virginia Trout Stream Sensitivity Study 2010 Survey Results for Shenandoah National Park #12;1 Virginia Trout Stream Sensitivity Study 2010 Survey Results for Shenandoah National Park prepared by Rick Webb Projects Coordinator Shenandoah Watershed Study Virginia Trout Stream Sensitivity Study Department

  1. Olefin Recovery from Chemical Industry Waste Streams

    SciTech Connect

    A.R. Da Costa; R. Daniels; A. Jariwala; Z. He; A. Morisato; I. Pinnau; J.G. Wijmans

    2003-11-21

    The objective of this project was to develop a membrane process to separate olefins from paraffins in waste gas streams as an alternative to flaring or distillation. Flaring these streams wastes their chemical feedstock value; distillation is energy and capital cost intensive, particularly for small waste streams.

  2. Ex-stream Makeover Katie Stallcup

    E-print Network

    Ex-stream Makeover Katie Stallcup Staff Writer Opelika-Auburn News Monday, January 14, 2008 Water of Auburn, among others, to rebuild a stream in Town Creek Park off South Gay Street. The agency recently the stream. "It looks at more than just trying to make it attractive - it physically restores its function

  3. Maximizing Resource Utilization in Video Streaming Systems

    ERIC Educational Resources Information Center

    Alsmirat, Mohammad Abdullah

    2013-01-01

    Video streaming has recently grown dramatically in popularity over the Internet, Cable TV, and wire-less networks. Because of the resource demanding nature of video streaming applications, maximizing resource utilization in any video streaming system is a key factor to increase the scalability and decrease the cost of the system. Resources to

  4. Understanding Internet Traffic Streams: Dragonflies and Tortoises

    E-print Network

    California at San Diego, University of

    Understanding Internet Traffic Streams: Dragonflies and Tortoises Nevil Brownlee CAIDA, SDSC, UC (50% to 60%) of the total bytes on a given link. We define tortoises as streams that last longer than and tortoises) but also by size (mice and elephants), and note that stream size and lifetime are independent

  5. Merging Multiple Data Streams on Common Keys

    E-print Network

    Grossman, Robert

    Merging Multiple Data Streams on Common Keys over High Performance Networks Marco Mazzucco, Asvin distributed streams is to merge them using a common key. In this paper, we present two algorithms for merging is with the problem of merging two data streams using a common key. This is one of the fundamental operations required

  6. Where Did All the Streams Go? Effects of Urbanization on Hydrologic Permanence of Headwater Streams

    EPA Science Inventory

    Headwater streams represent a majority (up to 70%) of the stream length in the United States; however, these small streams are often piped or filled to accommodate residential, commercial, and industrial development. Legal protection of headwater streams under the Clean Water Ac...

  7. STREAM-GROUNDWATER INTERACTIONS ALONG STREAMS OF THE EASTERN SIERRA NEVADA, CALIFORNIA: IMPLICATIONS

    E-print Network

    STREAM-GROUNDWATER INTERACTIONS ALONG STREAMS OF THE EASTERN SIERRA NEVADA, CALIFORNIA to groundwater in the reach of interest. Flow measurements on eight streams in the Owens River and Mono Lake basins show that stream- groundwater interactions can pro- duce substantial changes in flow

  8. Academic Self-Concepts in Ability Streams: Considering Domain Specificity and Same-Stream Peers

    ERIC Educational Resources Information Center

    Liem, Gregory Arief D.; McInerney, Dennis M.; Yeung, Alexander S.

    2015-01-01

    The study examined the relations between academic achievement and self-concepts in a sample of 1,067 seventh-grade students from 3 core ability streams in Singapore secondary education. Although between-stream differences in achievement were large, between-stream differences in academic self-concepts were negligible. Within each stream, levels of

  9. The Turing Stream Cipher November 30, 2002 The Turing Stream Cipher November 30, 2002

    E-print Network

    International Association for Cryptologic Research (IACR)

    [23] and SAFER[22]. 1. Introduction Turing (named after Alan Turing) is a stream cipher designedThe Turing Stream Cipher November 30, 2002 The Turing Stream Cipher November 30, 2002 1 Turing NSW 2111, Australia {ggr, phawkes}@qualcomm.com Abstract. This paper proposes the Turing stream cipher

  10. Stream Virtual Machine and Two-Level Compilation Model for Streaming Architectures and Languages

    E-print Network

    Kozyrakis, Christos

    Stream Virtual Machine and Two-Level Compilation Model for Streaming Architectures and Languages The Stream Virtual Machine, by Franois Labont, Ian Buck, Peter Mattson, Christos Kozyrakis, and Mark Horowitz, presented at PACT 2004. The stream computing paradigm separates the application's computational

  11. StreamIt: A Language for Streaming Applications William Thies, Michal Karczmarek, and Saman Amarasinghe

    E-print Network

    Amarasinghe, Saman

    StreamIt: A Language for Streaming Applications William Thies, Michal Karczmarek, and Saman, karczma, saman}@lcs.mit.edu Abstract. We characterize high-performance streaming applications as a new and distinct domain of programs that is becoming increasingly im- portant. The StreamIt language provides novel

  12. Submission to ECRYPT call for stream ciphers: the self-synchronizing stream cipher Mosquito

    E-print Network

    Bernstein, Daniel

    Submission to ECRYPT call for stream ciphers: the self-synchronizing stream cipher Mosquito Joan-oriented self-synchronizing stream cipher Mosquito and the underlying cipher architecture and provide hardware Mosquito. Self- synchronizing stream encryption can be performed by using a block cipher in CFB mode

  13. Assessing Stream Bed Stability and Excess Sedimentation in Mountain Streams

    NASA Astrophysics Data System (ADS)

    Faustini, J. M.; Kaufmann, P. R.

    2002-12-01

    Land use and resource exploitation in headwaters catchments, such as logging, mining, and road building, often increase sediment supply to streams, potentially causing excess sedimentation. Decreases in mean substrate size and increases in fine stream bed sediments can lead to increased frequency of bed scour, while accumulation of fine sediments in the interstices of coarse bed particles can adversely impact salmon spawning habitat and reduce habitat availability for benthic organisms. We are testing an index of relative bed stability (RBS), based on reach-scale synoptic stream surveys, that is calculated as the ratio of the observed geometric mean particle diameter to the estimated critical diameter at bankfull flow after adjusting for shear stress losses due to channel morphology and large woody debris (LWD). We hypothesize that in watersheds not altered by human disturbances, transport capacity should be in rough equilibrium with sediment supply and RBS should be close to unity. In streams where human activity has substantially augmented sediment supply, we expect that textural fining may occur, leading to lower RBS values. However, downstream trends of decreasing slope and particle size and increasing sediment supply might lead to systematic downstream trends in RBS, and variations in local channel characteristics could cause variability in calculated RBS values. To test whether RBS is useful as an indicator of textural fining in response to anthropogenic disturbance, we sampled streams in watersheds spanning a wide range of disturbance intensity (high, medium and low) in two sub-regions of contrasting lithology in the northern Coast Range of Oregon and in the mid-Atlantic U.S. In each watershed we sampled 3 closely-spaced main stem reaches (30-50 km2 drainage area) and 3 reaches in one or more smaller tributaries (5-10 km2) to assess local variability and within-basin longitudinal trends in RBS relative to variation between watersheds with different land use intensity. Preliminary results show the predicted association between land use and RBS in watersheds underlain by erodible rocks, but not in those underlain by resistant rocks. RBS did not show any downstream trends in our sample.

  14. Streaming Media Collections General Guideline for the Selection &

    E-print Network

    Chrispell, John

    Streaming Media Collections General Guideline for the Selection & Acquisition of Streaming Media Prepared by the Streaming Media Task Force (Tony Bremholm, Lisa Hooper, Sally Krash, Josh Lupkin) February..................................................................................................................................... 3 What is streaming media

  15. Living Systems Energy Module

    SciTech Connect

    1995-09-26

    The Living Systems Energy Module, renamed Voyage from the Sun, is a twenty-lesson curriculum designed to introduce students to the major ways in which energy is important in living systems. Voyage from the Sun tells the story of energy, describing its solar origins, how it is incorporated into living terrestrial systems through photosynthesis, how it flows from plants to herbivorous animals, and from herbivores to carnivores. A significant part of the unit is devoted to examining how humans use energy, and how human impact on natural habitats affects ecosystems. As students proceed through the unit, they read chapters of Voyage from the Sun, a comic book that describes the flow of energy in story form (Appendix A). During the course of the unit, an ``Energy Pyramid`` is erected in the classroom. This three-dimensional structure serves as a classroom exhibit, reminding students daily of the importance of energy and of the fragile nature of our living planet. Interactive activities teach students about adaptations that allow plants and animals to acquire, to use and to conserve energy. A complete list of curricular materials and copies of all activity sheets appear in Appendix B.

  16. Living with Rh Incompatibility

    MedlinePLUS

    ... Twitter. Living With Rh Incompatibility If you have Rh-negative blood, injections of Rh immune globulin can reduce your risk of Rh ... baby or come in contact with Rh-positive blood. If you're Rh-negative, your risk of problems from Rh incompatibility is ...

  17. You Live, You Learn

    ERIC Educational Resources Information Center

    Biesta, Gert

    2008-01-01

    The Learning Lives project, a four-year study into the learning biographies and trajectories of adults, was conducted by a team of researchers from the universities of Stirling, Exeter, Brighton and Leeds as part of the Teaching and Learning Research Programme (TLRP) of the Economic and Social Research Council, and has just been completed. Whereas

  18. The Living Periodic Table

    ERIC Educational Resources Information Center

    Nahlik, Mary Schrodt

    2005-01-01

    To help make the abstract world of chemistry more concrete eighth-grade students, the author has them create a living periodic table that can be displayed in the classroom or hallway. This display includes information about the elements arranged in the traditional periodic table format, but also includes visual real-world representations of the

  19. Dementia and Assisted Living

    ERIC Educational Resources Information Center

    Hyde, Joan; Perez, Rosa; Forester, Brent

    2007-01-01

    Purpose: This article presents an overview of what is known about dementia services in assisted living settings and suggests areas for future research. Design and Methods: We undertook a search of Medline, the "Journals of Gerontology," and "The Gerontologist." We then organized publications dealing with the target subject into 10 topic areas and

  20. Living with Cystic Fibrosis

    MedlinePLUS

    ... from the NHLBI on Twitter. Living With Cystic Fibrosis If you or your child has cystic fibrosis (CF), you should learn as much as you ... about CF Care Centers, go to the Cystic Fibrosis Foundation's Care Center Network Web page. It's standard ...

  1. Living with Spina Bifida

    MedlinePLUS

    ... Living With Spina Bifida Infants Toddlers and Preschoolers School-Aged Adolescents & Teens Young Adults Videos My Story Data and Statistics Research & ... following links: Newborns and Infants Toddlers and Preschoolers School-Aged ... and Teenagers Young Adults Read Nancy's personal story about her son ...

  2. Learning from Live Theater

    ERIC Educational Resources Information Center

    Greene, Jay P.; Hitt, Collin; Kraybill, Anne; Bogulski, Cari A.

    2015-01-01

    Culturally enriching field trips matter. They produce significant benefits for students on a variety of educational outcomes that schools and communities care about. This experiment on the effects of field trips to see live theater demonstrates that seeing plays is an effective way to teach academic content; increases student tolerance by

  3. Microholography of Living Organisms.

    ERIC Educational Resources Information Center

    Solem, Johndale C.; Baldwin, George C.

    1982-01-01

    By using intense pulsed coherent x-ray sources it will be possible to obtain magnified three-dimensional images of living elementary biological structures at precisely defined instants. Discussed are sources/geometrics for x-ray holography, x-radiation interactions, factors affecting resolution, recording the hologram, high-intensity holography,

  4. Design for Living

    ERIC Educational Resources Information Center

    Rosenblum, Todd

    2011-01-01

    Bringing a newborn home from the hospital can come with stress for any parent. Coming home with twins can be double the stress. This article shares the story of a couple faced with this situation 12 years ago with the birth of twins, one was born with complications. They lived in a Colonial until the twins were almost five years old, at which time

  5. Streaming visualization for collaborative environments.

    SciTech Connect

    Hereld, M.; Olson, E.; Papka, M. E.; Uram, T. D.

    2008-01-01

    Connecting expensive and scarce visual data analysis resources to end-users is a major challenge today. We describe a flexible mechanism for meeting this challenge based on commodity compression technologies for streaming video. The advantages of this approach include simplified application development, access to generic client components for viewing, and simplified incorporation of improved codecs as they become available. In this paper we report newly acquired experimental results for two different applications being developed to exploit this approach and test its merits. One is based on a new plugin for ParaView that adds video streaming cleanly and transparently to existing applications. The other is a custom volume rendering application with new remote capabilities. Using typical datasets under realistic conditions, we find the performance for both is satisfactory.

  6. Electrochemical/Pyrometallurgical Waste Stream Processing and Waste Form Fabrication

    SciTech Connect

    Steven Frank; Hwan Seo Park; Yung Zun Cho; William Ebert; Brian Riley

    2015-07-01

    This report summarizes treatment and waste form options being evaluated for waste streams resulting from the electrochemical/pyrometallurgical (pyro ) processing of used oxide nuclear fuel. The technologies that are described are South Korean (Republic of Korea ROK) and United States of America (US) centric in the approach to treating pyroprocessing wastes and are based on the decade long collaborations between US and ROK researchers. Some of the general and advanced technologies described in this report will be demonstrated during the Integrated Recycle Test (IRT) to be conducted as a part of the Joint Fuel Cycle Study (JFCS) collaboration between US Department of Energy (DOE) and ROK national laboratories. The JFCS means to specifically address and evaluated the technological, economic, and safe guard issues associated with the treatment of used nuclear fuel by pyroprocessing. The IRT will involve the processing of commercial, used oxide fuel to recover uranium and transuranics. The recovered transuranics will then be fabricated into metallic fuel and irradiated to transmutate, or burn the transuranic elements to shorter lived radionuclides. In addition, the various process streams will be evaluated and tested for fission product removal, electrolytic salt recycle, minimization of actinide loss to waste streams and waste form fabrication and characterization. This report specifically addresses the production and testing of those waste forms to demonstrate their compatibility with treatment options and suitability for disposal.

  7. Small mammal populations in a restored stream corridor

    SciTech Connect

    Wike, L.D.

    2000-03-13

    An opportunity to study the response of a small mammal community to restoration of a riparian wetland was provided by the Pen Branch project at the Savannah River Site (SRS). Live trapping of small mammals was conducted on six transects at Pen Branch in 1996 and 1998 and at three transects at Meyer's Branch, an unimpacted stream at SRS, in 1997 and 1998. Distributions of rates of capture of the four most common species were both spatially and temporally uneven. Kruskal-Wallis one-way analysis of variance found no significant differences in the relationship of capture rates between species and between treatment and both the within-stream control and Meyers Branch. Habitat use and movement within stream corridors appears to be dependent primarily on species, with age and sex perhaps contributing to preference and distance moved. The lack of differences in capture rates related to transect or treatment may be due to the close proximity of sample transects relative to the movement potential of the species sampled.

  8. Interplanetary stream magnetism - Kinematic effects

    NASA Technical Reports Server (NTRS)

    Burlaga, L. F.; Barouch, E.

    1976-01-01

    The particle density and the magnetic-field intensity and direction are calculated for volume elements of the solar wind as a function of the initial magnetic-field direction and the initial speed gradient. It is assumed that the velocity is constant and radial. These assumptions are approximately valid between about 0.1 and 1.0 AU for many streams. Time profiles of the particle density, field intensity, and velocity are calculated for corotating streams, neglecting effects of pressure gradients. The compression and rarefaction of the magnetic field depend sensitively on the initial field direction. By averaging over a typical stream, it is found that the average radial field intensity is inversely proportional to the square of the heliocentric distance, whereas the average intensity in the direction of the planets' motion does not vary in a simple way, consistent with deep space observations. Changes of field direction may be very large, depending on the initial angle; but when the initial angle at 0.1 AU is such that the base of the field line corotates with the sun, the spiral angle is the preferred direction at 1 AU. The theory is also applicable to nonstationary flows.

  9. Southern Hemisphere meteor stream determinations

    NASA Technical Reports Server (NTRS)

    Gartrell, G.; Elford, W. G.

    1975-01-01

    Meteor orbits have been deduced from radio observations of meteor trails carried out at Adelaide, Australia, using a combined multistation CW and pulse radar system operating at 27 MHz. The orbits of 1667 meteors have been determined down to a limiting radio magnitude of +8. The data have been systematically searched for stream meteors, and the significance of minor associations has been appraised. Altogether, 40.4% of the orbits were found to be associated with at least one other orbit, and 29.8% with two or more. Numerous minor streams with high inclination and low eccentricity have been found at deep southern declinations from December to March, with little activity in this quarter during June and October. In addition to confirming several previously established cometary associations, a comprehensive search has indicated that 34 of the meteor associations may be related to 17 comets. Associations between several long-period comets and low-eccentricity high-inclination streams appear to be indisputable, and they confirm the origin of at least some of the 'toroidal group' meteors.

  10. Fitting orbits to tidal streams

    NASA Astrophysics Data System (ADS)

    Binney, James

    2008-05-01

    Recent years have seen the discovery of many tidal streams through the Galaxy. Relatively straightforward observations of a stream allow one to deduce three phase-space coordinates of an orbit. An algorithm is presented that reconstructs the missing phase-space coordinates from these data. The reconstruction starts from assumed values of the Galactic potential and a distance to one point on the orbit, but with noise-free data the condition that energy be conserved on the orbit enables one to reject incorrect assumptions. The performance of the algorithm is investigated when errors are added to the input data that are comparable to those in published data for the streams of Pal 5. It is found that the algorithm returns distances and proper motions that are accurate to of the order of 1 per cent, and enables one to reject quite resonable but incorrect trial potentials. In practical applications, it will be important to minimize errors in the imput data, and there is considerable scope for doing this.

  11. Towards quantifying fuzzy stream power

    NASA Astrophysics Data System (ADS)

    Schwanghart, W.; Korup, O.

    2012-04-01

    Deterministic flow direction algorithms such as the D8 have wide application in numerical models of landscape evolution. These simple algorithms play a central role in quantifying drainage basin area, and hence approximatingvia empirically derived relationships from regional flood frequency and hydraulic geometrystream power or fluvial erosion potential. Here we explore how alternative algorithms that employ a probabilistic choice of flow direction affect quantitative estimates of stream power. We test a probabilistic multi-flow direction algorithm within the MATLAB TopoToolbox in model and real landscapes of low topographic relief and minute gradients, where potentially fuzzy drainage divides are dictated by, among others, alluvial fan dynamics, playa infill, and groundwater fluxes and seepage. We employ a simplistic numerical landscape evolution model that simulates fluvial incision and hillslope diffusion and explicitly models the existence and capture of endorheic basins that prevail in (semi-)arid, low-relief landscapes. We discuss how using this probabilistic multi-flow direction algorithm helps represent and quantify uncertainty about spatio-temporal drainage divide locations and how this bears on quantitative estimates of downstream stream power and fluvial erosion potential as well as their temporal dynamics.

  12. Evidence of Fanning in the Ophiuchus Stream

    NASA Astrophysics Data System (ADS)

    Sesar, Branimir; Price-Whelan, Adrian M.; Cohen, Judith G.; Rix, Hans-Walter; Pearson, Sarah; Johnston, Kathryn V.; Bernard, Edouard J.; Ferguson, Annette M. N.; Martin, Nicolas F.; Slater, Colin T.; Chambers, Kenneth C.; Flewelling, Heather; Wainscoat, Richard J.; Waters, Christopher

    2016-01-01

    The Ophiuchus stellar stream presents a dynamical puzzle: its old stellar populations (12 Gyr) cannot be reconciled with (1) its orbit in a simple model for the Milky Way potential and (2) its short angular extent, both of which imply that the observed stream formed within the last < 1 {{Gyr}}. Recent theoretical work has shown that streams on chaotic orbits may abruptly fan out near their apparent ends; stars in these fans are dispersed in both position and velocity and may be difficult to associate with the stream. Here we present the first evidence of such stream-fanning in the Ophiuchus stream, traced by four blue horizontal branch stars beyond the apparent end of the stream. These stars stand out from the background by their high velocities ({v}{{los}}> 230 km s-1) against 40 other stars: their velocities are comparable to those of the stream, but would be exceptional if they were unrelated halo stars. Their positions and velocities are, however, inconsistent with simple extrapolation of the observed cold, high-density portion of the stream. These observations suggest that stream-fanning may be a real, observable effect and, therefore, that Ophiuchus may be on a chaotic orbit. They also show that the Ophiuchus stream is more extended and hence dynamically older than previously thought, easing the stellar population versus dynamical age tension.

  13. This is your stream. This is your stream on drugs: Scientists' expanding research and technologies show that traces of pharmaceuticals in water may threaten aquatic health.

    E-print Network

    Jordan, Leslie

    2010-01-01

    is not to people,? Brooks said. ?By looking at therapeutic thresh- olds for drugs, we see that these risks are much lower than others we experience in life, such as driving to work. But there are risks for the organ- isms living in these streams... their expired prescription pain-killers. In each case, traces of these drugs and other pharmachemical compounds can make their way through wastewater treatment facilities and eventually into natural water ways that supply drink- ing water for humans...

  14. Is there a future for mesh-based live video streaming? Peer-to-peer live streaming systems allow a bandwidth-

    E-print Network

    Massouli, Laurent

    -based approaches. We answer that question by showing that a carefully- designed mesh-based system can achieve close-to-optimal to construct and is highly resistant to churn. In addition, we identify several design optimiza- tions which. Motivated by these issues, recent research has focused on designing systems that achieve close-to-optimal

  15. Role of microbes associated with organic and inorganic substrates in phosphorus spiralling in a woodland stream

    SciTech Connect

    Elwood, J.W.; Newbold, J.D.; O'Neill, R.V.; Stark, R.W.; Singley, P.T.

    1980-01-01

    Laboratory and field experiments were conducted to determine if nutrient spiralling is primarily a biological process. The experiments were conducted to examine the role of microbial uptake and abiotic sorption onto organic and inorganic substrates in the uptake of PO/sub 4/-P in Walker Branch, a small, first-order woodland stream in east Tennessee, to estimate the total, microbial, and adsorptive pool sizes of exchangeable phosphorus associated with five particulate organic matter from this stream, and to measure the turnover rate of PO/sub 4/-P by live and sterile inorganic substrates in Walker Branch.

  16. Photocontrolled living polymerizations

    NASA Astrophysics Data System (ADS)

    Tanabe, Makoto; Vandermeulen, Guido W. M.; Chan, Wing Yan; Cyr, Paul W.; Vanderark, Lawrence; Rider, David A.; Manners, Ian

    2006-06-01

    Living polymerizations involve the creation of polymer chains without significant irreversible chain transfer or chain termination. Such processes are widely used to access well-defined macromolecular materials with controlled architectures, such as block and star polymers. Although this concept was first realized for anionic polymerizations in the 1950s, many key recent advances have been made, most notably in the area of radical polymerization. Here, we report a living photopolymerization that involves photoexcited monomers. Exposure of metal-containing ferrocenophane monomers to Pyrex-filtered light from a mercury lamp (?>310 nm) or to bright sunlight in the presence of an anionic initiator leads to living polymerizations, in which the conversion and molecular weight of the resulting polymer can be controlled by the irradiation time. Photoirradiation selectively weakens the iron-cyclopentadienyl bond in the monomer, allowing the use of moderately basic and highly functional-group-tolerant initiators. The polymerization proceeds through attack of the initiator and propagating anion on the iron atom of the photoexcited monomer and, remarkably, the polymerization rate decreases with increasing temperature. Block copolymer formation is possible when the light source is alternately switched on and off in between sequential addition of different monomers, providing unprecedented, photocontrolled access to new types of functional polymers.

  17. Families and Assisted Living*

    PubMed Central

    Gaugler, Joseph E.; Kane, Robert L.

    2008-01-01

    Purpose Despite growing research on assisted living (AL) as a residential care option for older adults, the social ramifications of residents' transitions to assisted living is relatively unexplored. This article examines family involvement in AL, including family structures of residents, types of involvement from family members living outside the AL, and outcomes for these family members. Design and Methods We reviewed current literature utilizing the MEDLINE, PSYCINFO, and CINAHL databases to identify AL studies that examined issues pertaining to families or informal care. Following the screening of abstracts, 180 reports were retrieved for further review, and 62 studies were selected for inclusion. Results Families visit residents frequently and provide a wide range of instrumental assistance but provide only minimal personal care. Studies of family outcomes indicated relatively high satisfaction, but potential care burden as well. Implications How family care and involvement occurs in AL in relation to formal care provision and whether various types of formal-informal care integration influence family outcomes remains unclear. We suggest a research agenda that attempts to tease out causal relationships for family involvement, differentiate family roles, and implement longitudinal analyses for a range of family outcomes. PMID:18162571

  18. Cooperation stimulation strategies for peer-to-peer wireless live video-sharing social networks.

    PubMed

    Lin, W Sabrina; Zhao, H Vicky; Liu, K J Ray

    2010-07-01

    Human behavior analysis in video sharing social networks is an emerging research area, which analyzes the behavior of users who share multimedia content and investigates the impact of human dynamics on video sharing systems. Users watching live streaming in the same wireless network share the same limited bandwidth of backbone connection to the Internet, thus, they might want to cooperate with each other to obtain better video quality. These users form a wireless live-streaming social network. Every user wishes to watch video with high quality while paying as little as possible cost to help others. This paper focuses on providing incentives for user cooperation. We propose a game-theoretic framework to model user behavior and to analyze the optimal strategies for user cooperation simulation in wireless live streaming. We first analyze the Pareto optimality and the time-sensitive bargaining equilibrium of the two-person game. We then extend the solution to the multiuser scenario. We also consider potential selfish users' cheating behavior and malicious users' attacking behavior and analyze the performance of the proposed strategies with the existence of cheating users and malicious attackers. Both our analytical and simulation results show that the proposed strategies can effectively stimulate user cooperation, achieve cheat free and attack resistance, and help provide reliable services for wireless live streaming applications. PMID:20227979

  19. Combining Live Video and Audio Broadcasting, Synchronous Chat, and Asynchronous Open Forum Discussions in Distance Education

    ERIC Educational Resources Information Center

    Teng, Tian-Lih; Taveras, Marypat

    2004-01-01

    This article outlines the evolution of a unique distance education program that began as a hybrid--combining face-to-face instruction with asynchronous online teaching--and evolved to become an innovative combination of synchronous education using live streaming video, audio, and chat over the Internet, blended with asynchronous online discussions

  20. INTRODUCTION Fish that live in moving water must contend with complex flows

    E-print Network

    Liao, James C.

    3442 INTRODUCTION Fish that live in moving water must contend with complex flows arising from current moving past objects. Understanding how fish swim in unsteady flows has attracted attention from many disciplines, ranging from stream ecologists investigating how fish relate to habitat, to engineers

  1. Living with Lupus (For Parents)

    MedlinePLUS

    ... With Bullies Pregnant? What to Expect Living With Lupus KidsHealth > Parents > Diseases & Conditions > Arthritis & Rheumatologic Conditions > Living ... disease for both doctors and their patients. About Lupus A healthy immune system produces proteins called antibodies ...

  2. Preventive Services for Healthy Living

    MedlinePLUS

    MENU Return to Web version Preventive Services for Healthy Living Preventive Services for Healthy Living How can my doctor help me stay healthy? ... preventive service"? A preventive service might be a test, or it might be advice from your doctor. ...

  3. Coffee Drinkers May Live Longer

    MedlinePLUS

    ... nlm.nih.gov/medlineplus/news/fullstory_155736.html Coffee Drinkers May Live Longer Regular java and decaf ... 16, 2015 MONDAY, Nov. 16, 2015 (HealthDay News) -- Coffee lovers may live longer than those who don' ...

  4. Network Characteristics of Video Streaming Traffic

    E-print Network

    Rao, Ashwin; Barakat, Chadi; Legout, Arnaud; Towsley, Don; Dabbous, Walid

    2011-01-01

    Video streaming represents a large fraction of Internet traffic. Surprisingly, little is known about the network characteristics of this traffic. In this paper, we study the network characteristics of the two most popular video streaming services, Netflix and YouTube. We show that the streaming strategies vary with the type of the application (Web browser or native mobile application), and the type of container (Silverlight, Flash, or HTML5) used for video streaming. In particular, we identify three different streaming strategies that produce traffic patterns from non-ack clocked ON-OFF cycles to bulk TCP transfer. We then present an analytical model to study the potential impact of these streaming strategies on the aggregate traffic and make recommendations accordingly.

  5. Evidence of Fanning in the Ophiuchus Stream

    E-print Network

    Sesar, B; Cohen, J G; Rix, H -W; Pearson, S; Johnston, K V; Bernard, E J; Ferguson, A M N; Martin, N F; Slater, C T; Chambers, K C; Flewelling, H; Wainscoat, R J; Waters, C

    2015-01-01

    The Ophiuchus stellar stream presents a dynamical puzzle: its old stellar populations ($\\sim 12$ Gyr) cannot be reconciled with (1) its orbit in a simple model for the Milky Way potential and (2) its short angular extent, both of which imply that the observed stream formed within the last $ 230$ km s$^{-1}$) against $\\sim 40$ other stars: their velocities are comparable to those of the stream, but would be exceptional if they were unrelated halo stars. Their positions and velocities are, however, inconsistent with simple extrapolation of the observed cold, high-density portion of the stream. These observations suggest that stream-fanning may be a real, observable effect and, therefore, that Ophiuchus may be on a chaotic orbit. They also show that the Ophiuchus stream is more extended and hence dynamically older than previously thought, easing the stellar population vs. dynamical age tension.

  6. Transitive closure on the imagine stream processor

    SciTech Connect

    Griem, Gorden; Oliker, Leonid

    2003-11-11

    The increasing gap between processor and memory speeds is a well-known problem in modern computer architecture. The Imagine system is designed to address the processor-memory gap through streaming technology. Stream processors are best-suited for computationally intensive applications characterized by high data parallelism and producer-consumer locality with minimal data dependencies. This work examines an efficient streaming implementation of the computationally intensive Transitive Closure (TC) algorithm on the Imagine platform. We develop a tiled TC algorithm specifically for the Imagine environment, which efficiently reuses streams to minimize expensive off-chip data transfers. The implementation requires complex stream programming since the memory hierarchy and cluster organization of the underlying architecture are exposed to the Imagine programmer. Results demonstrate that limited performance of TC is achieved primarily due to the complicated data-dependencies of the blocked algorithm. This work is an ongoing effort to identify classes of scientific problems well-suited for streaming processors.

  7. Live from the Arctic

    NASA Astrophysics Data System (ADS)

    Haines-Stiles, G.; Warnick, W. K.; Warburton, J.; Sunwood, K.

    2003-12-01

    For reasons of geography and geophysics, the poles of our planet, the Arctic and Antarctica, are places where climate change appears first: they are global canaries in the mine shaft. But while Antarctica (its penguins and ozone hole, for example) has been relatively well-documented in recent books, TV programs and journalism, the far North has received somewhat less attention. This project builds on and advances what has been done to date to share the people, places, and stories of the North with all Americans through multiple media, over several years. In a collaborative project between the Arctic Research Consortium of the United States (ARCUS) and PASSPORT TO KNOWLEDGE, Live from the Arctic will bring the Arctic environment to the public through a series of primetime broadcasts, live and taped programming, interactive virtual field trips, and webcasts. The five-year project will culminate during the 2007-2008 International Polar Year (IPY). Live from the Arctic will: A. Promote global understanding about the value and world -wide significance of the Arctic, B. Bring cutting-edge research to both non-formal and formal education communities, C. Provide opportunities for collaboration between arctic scientists, arctic communities, and the general public. Content will focus on the following four themes. 1. Pan-Arctic Changes and Impacts on Land (i.e. snow cover; permafrost; glaciers; hydrology; species composition, distribution, and abundance; subsistence harvesting) 2. Pan-Arctic Changes and Impacts in the Sea (i.e. salinity, temperature, currents, nutrients, sea ice, marine ecosystems (including people, marine mammals and fisheries) 3. Pan-Arctic Changes and Impacts in the Atmosphere (i.e. precipitation and evaporation; effects on humans and their communities) 4. Global Perspectives (i.e. effects on humans and communities, impacts to rest of the world) In The Earth is Faster Now, a recent collection of comments by members of indigenous arctic peoples, arctic residents speak in eloquent terms of the changes they see around them, manifested in new patterns of vegetation, the melting of permafrost and the absence of game species that used to be abundant. Meanwhile, new satellites and more sophisticated sensors on the ground and in the ice, add scientific testimony that seems to support and even extend native perceptions. Live from the Arctic will unify both perspectives, and use todays most powerful and effective communications media to connect young people and general audiences all across America to researchers and communities living and working in the Arctic. During IPY there will be a level of interest in the Polar regions unprecedented in a generation. Live from the Arctic offers unique resources to satisfy that curiosity, and encourage active participation and engagement in understanding some of Earths most significant peoples, places and rapidly changing conditions.

  8. Valuing different human lives.

    PubMed

    Goodwin, Geoffrey P; Landy, Justin F

    2014-04-01

    Do people think of the value of all human lives as equivalent irrespective of age? Affirmations of the equal value of all human lives are culturally prominent, yet much evidence points to the fact that the young are often prioritized over the old in life-and-death decision-making contexts. Studies 1-3 aimed to reconcile this tension by showing that although individuals are seen as more equal with respect to negative rights not to be harmed or killed (though not completely equal), they are seen as less equal with respect to positive rights to be aided or saved. Age exerts a large and systematic impact on decisions about who to save and about whose death is more tragic, suggesting that individuals are seen as possessing differing amounts of contingent value. These initial studies also yielded the novel finding that, although children are prioritized over adults, older children are often prioritized over younger children. Study 4 replicated this finding with a think-aloud methodology; the study showed that the preference for older children appears to be driven by their having had more invested in their lives, their better developed social relations, and their greater understanding of death. Studies 5a-5c demonstrated the independent causal effects of each of these variables on judgments of life's value. Finally, in Studies 6 and 7, mediation methods were used to show that older children's more meaningful social relations primarily explain the greater value of older than of younger children. These findings have implications for bioethics and medical policy. PMID:23647311

  9. Dynamics of Living Polymers

    E-print Network

    Ben O'Shaughnessy; Dimitrios Vavylonis

    2003-09-22

    We study theoretically the dynamics of living polymers which can add and subtract monomer units at their live chain ends. The classic example is ionic living polymerization. In equilibrium, a delicate balance is maintained in which each initiated chain has a very small negative average growth rate (``velocity'') just sufficient to negate the effect of growth rate fluctuations. This leads to an exponential molecular weight distribution (MWD) with mean Nbar. After a small perturbation of relative amplitude epsilon, e.g. a small temperature jump, this balance is destroyed: the velocity acquires a boost greatly exceeding its tiny equilibrium value. For epsilon > epsilon_c = 1/Nbar^{1/2} the response has 3 stages: (1) Coherent chain growth or shrinkage, leaving a highly non-linear hole or peak in the MWD at small chain lengths. During this episode, lasting time taufast ~ Nbar, the MWD's first moment and monomer concentration m relax very close to equilibrium. (2) Hole-filling (or peak decay) after taufill ~ epsilon^2 Nbar^2. The absence or surfeit of small chains is erased. (3) Global MWD shape relaxation after tauslow ~ Nbar^2. By this time second and higher MWD moments have relaxed. During episodes (2) and (3) the fast variables (Nbar,m) are enslaved to the slowly varying number of free initiators (chains of zero length). Thus fast variables are quasi-statically fine-tuned to equilibrium. The outstanding feature of these dynamics is their ultrasensitivity: despite the perturbation's linearity, the response is non-linear until the late episode (3). For very small perturbations, epsilon < epsilon_c, response remains non-linear but with a less dramatic peak or hole during episode (1). Our predictions are in agreement with viscosity measurements on the most widely studied system, alpha-methylstyrene.

  10. Precession of the Sagittarius stream

    E-print Network

    Belokurov, V; Evans, N W; Pearrubia, J; Irwin, M J; Smith, M C; Lewis, G F; Gieles, M; Wilkinson, M; Gilmore, G; Olszewski, E W; Niederste-Ostholt, M N

    2013-01-01

    Using a variety of stellar tracers -- blue horizontal branch stars, main-sequence turn-off stars and red giants -- we follow the path of the Sagittarius (Sgr) stream across the sky in Sloan Digital Sky Survey data. Our study presents new Sgr debris detections, accurate distances and line-of-sight velocities that together help to shed new light on the puzzle of the Sgr tails. For both the leading and the trailing tail, we trace the points of their maximal extent, or apo-centric distances, and find that they lie at R^L = 47.8 +/- 0.5 kpc and R^T = 102.5 +/- 2.5 kpc respectively. The angular difference between the apo-centres is 93.2 +/- 3.5 deg, which is smaller than predicted for isothermal haloes. It is consistent with models of the Milky Way in which the dark matter density falls more quickly with radius. Based on its position and radial velocity, we show that the unusually large globular cluster NGC 2419 is associated with the Sgr trailing stream. We measure the precession of the orbital plane of the Sgr de...

  11. Streaming Instabilities in Protoplanetary Disks

    E-print Network

    Andrew N. Youdin; Jeremy Goodman

    2004-09-10

    Interpenetrating streams of solids and gas in a Keplerian disk produce a local, linear instability. The two components mutually interact via aerodynamic drag, which generates radial drift and triggers unstable modes. The secular instability does not require self-gravity, yet it generates growing particle density perturbations that could seed planetesimal formation. Growth rates are slower than dynamical, but faster than radial drift, timescales. Growth rates, like streaming velocities, are maximized for marginal coupling (stopping times comparable dynamical times). Fastest growth occurs when the solid to gas density ratio is order unity and feedback is strongest. Curiously, growth is strongly suppressed when the densities are too nearly equal. The relation between background drift and wave properties is explained by analogy with Howard's semicircle theorem. The three-dimensional, two-fluid equations describe a sixth order (in the complex frequency) dispersion relation. A terminal velocity approximation allows simplification to an approximate cubic dispersion relation. To describe the simplest manifestation of this instability, we ignore complicating (but possibly relevant) factors like vertical stratification, dispersion of particle sizes, turbulence, and self-gravity. We consider applications to planetesimal formation and compare our work to other studies of particle-gas dynamics.

  12. Living olefin polymerization processes

    DOEpatents

    Schrock, Richard R. (Winchester, MA); Baumann, Robert (Cambridge, MA)

    1999-01-01

    Processes for the living polymerization of olefin monomers with terminal carbon-carbon double bonds are disclosed. The processes employ initiators that include a metal atom and a ligand having two group 15 atoms and a group 16 atom or three group 15 atoms. The ligand is bonded to the metal atom through two anionic or covalent bonds and a dative bond. The initiators are particularly stable under reaction conditions in the absence of olefin monomer. The processes provide polymers having low polydispersities, especially block copolymers having low polydispersities. It is an additional advantage of these processes that, during block copolymer synthesis, a relatively small amount of homopolymer is formed.

  13. Living with lightning

    SciTech Connect

    Lamarre, L.

    1994-01-01

    As many as 100 lightning flashes occur around the world each second. Electric utilities know well the impact of lightning in terms of dollars, lost productivity, and lives. EPRI research, which began with a study of lightning`s natural characteristics, has resulted in tools utilities can use to better track and prepare for thunderstorms. Recently the institute completed a series of tests using small rockets to trigger and direct lightning strikes. Now EPRI-sponsored researchers are developing a laser-based technology they believe will be able to guide thunderbolts safely to the ground and ultimately even to discharge thunderclouds.

  14. Living olefin polymerization processes

    DOEpatents

    Schrock, Richard R.; Bauman, Robert

    2006-11-14

    Processes for the living polymerization of olefin monomers with terminal carbon-carbon double bonds are disclosed. The processes employ initiators that include a metal atom and a ligand having two group 15 atoms and a group 16 atom or three group 15 atoms. The ligand is bonded to the metal atom through two anionic or covalent bonds and a dative bond. The initiators are particularly stable under reaction conditions in the absence of olefin monomer. The processes provide polymers having low polydispersities, especially block copolymers having low polydispersities. It is an additional advantage of these processes that, during block copolymer synthesis, a relatively small amount of homopolymer is formed.

  15. Living olefin polymerization processes

    DOEpatents

    Schrock, Richard R.; Baumann, Robert

    2003-08-26

    Processes for the living polymerization of olefin monomers with terminal carbon-carbon double bonds are disclosed. The processes employ initiators that include a metal atom and a ligand having two group 15 atoms and a group 16 atom or three group 15 atoms. The ligand is bonded to the metal atom through two anionic or covalent bonds and a dative bond. The initiators are particularly stable under reaction conditions in the absence of olefin monomer. The processes provide polymers having low polydispersities, especially block copolymers having low polydispersities. It is an additional advantage of these processes that, during block copolymer synthesis, a relatively small amount of homopolymer is formed.

  16. Honoring living legends.

    PubMed

    Mussivand, Tofy

    2003-06-01

    From August 17 to 19, 2001, the University of Ottawa Heart Institute hosted the 6th Symposium of the World Artificial-Organ, Immunology and Transplantation Society (WAITS 2001). During WAITS 2001 a very special session entitled "Living Legends-Lessons Learned and Future Visions" was held. This session brought together giants in the field who had pioneered organ transplantation, cardiovascular surgery, pacemakers, and artificial hearts, among many other major contributions. The purpose of the session was to both honor and learn from those who have contributed greatly to the major scientific and technological advances in our field during the twentieth century. PMID:12780514

  17. Living olefin polymerization processes

    DOEpatents

    Schrock, R.R.; Baumann, R.

    1999-03-30

    Processes for the living polymerization of olefin monomers with terminal carbon-carbon double bonds are disclosed. The processes employ initiators that include a metal atom and a ligand having two group 15 atoms and a group 16 atom or three group 15 atoms. The ligand is bonded to the metal atom through two anionic or covalent bonds and a dative bond. The initiators are particularly stable under reaction conditions in the absence of olefin monomer. The processes provide polymers having low polydispersities, especially block copolymers having low polydispersities. It is an additional advantage of these processes that, during block copolymer synthesis, a relatively small amount of homopolymer is formed.

  18. Microencapsulation Of Living Cells

    NASA Technical Reports Server (NTRS)

    Chang, Manchium; Kendall, James M.; Wang, Taylor G.

    1989-01-01

    In experimental technique, living cells and other biological materials encapsulated within submillimeter-diameter liquid-filled spheres. Sphere material biocompatible, tough, and compliant. Semipermeable, permitting relatively small molecules to move into and out of sphere core but preventing passage of large molecules. New technique promises to make such spherical capsules at high rates and in uniform, controllable sizes. Capsules injected into patient through ordinary hypodermic needle. Promising application for technique in treatment of diabetes. Also used to encapsulate pituitary cells and thyroid hormone adrenocortical cells for treatment of other hormonal disorders, to encapsulate other secreting cells for transplantation, and to package variety of pharmaceutical products and agricultural chemicals for controlled release.

  19. Living Building Challenge 2.1

    E-print Network

    Reihl, K.; Tullos, A.

    2012-01-01

    stream_source_info ESL-KT-12-10-13.pdf.txt stream_content_type text/plain stream_size 30 Content-Encoding ISO-8859-1 stream_name ESL-KT-12-10-13.pdf.txt Content-Type text/plain; charset=ISO-8859-1 ...

  20. THERMAL HETEROGENEITY, STREAM CHANNEL MORPHOLOGY, AND SALMONID ABUNDANCE IN NORTHEASTERN OREGON STREAMS

    EPA Science Inventory

    Heterogeneity in stream water temperatures created by local influx of cooler subsurface waters into geomorphically complex stream channels was associated with increased abundance of rainbow trout (Oncorhynchus mykiss) and chinook salmon (O. tshawytscha) in northeastern Oregon. Th...

  1. An initial SPARROW model of land use and in-stream controls on total organic carbon in streams of the conterminous United States

    USGS Publications Warehouse

    Shih, Jhih-Shyang; Alexander, Richard B.; Smith, Richard A.; Boyer, Elizabeth W.; Shwarz, Grogory E.; Chung, Susie

    2010-01-01

    Watersheds play many important roles in the carbon cycle: (1) they are a site for both terrestrial and aquatic carbon dioxide (CO2) removal through photosynthesis; (2) they transport living and decomposing organic carbon in streams and groundwater; and (3) they store organic carbon for widely varying lengths of time as a function of many biogeochemical factors. Using the U.S. Geological Survey (USGS) Spatially Referenced Regression on Watershed Attributes (SPARROW) model, along with long-term monitoring data on total organic carbon (TOC), this research quantitatively estimates the sources, transport, and fate of the long-term mean annual load of TOC in streams of the conterminous United States. The model simulations use surrogate measures of the major terrestrial and aquatic sources of organic carbon to estimate the long-term mean annual load of TOC in streams. The estimated carbon sources in the model are associated with four land uses (urban, cultivated, forest, and wetlands) and autochthonous fixation of carbon (stream photosynthesis). Stream photosynthesis is determined by reach-level application of an empirical model of stream chlorophyll based on total phosphorus concentration, and a mechanistic model of photosynthetic rate based on chlorophyll, average daily solar irradiance, water column light attenuation, and reach dimensions. It was found that the estimate of in-stream photosynthesis is a major contributor to the mean annual TOC load per unit of drainage area (that is, yield) in large streams, with a median share of about 60 percent of the total mean annual carbon load in streams with mean flows above 500 cubic feet per second. The interquartile range of the model predictions of TOC from in-stream photosynthesis is from 0.1 to 0.4 grams (g) carbon (C) per square meter (m-2) per day (day-1) for the approximately 62,000 stream reaches in the continental United States, which compares favorably with the reported literature range for net carbon fixation by phytoplankton in lakes and streams. The largest contributors per unit of drainage area to the mean annual stream TOC load among the terrestrial sources are, in descending order: wetlands, urban lands, mixed forests, agricultural lands, evergreen forests, and deciduous forests . It was found that the SPARROW model estimates of TOC contributions to streams associated with these land uses are also consistent with literature estimates. SPARROW model calibration results are used to simulate the delivery of TOC loads to the coastal areas of seven major regional drainages. It was found that stream photosynthesis is the largest source of the TOC yields ( about 50 percent) delivered to the coastal waters in two of the seven regional drainages (the Pacific Northwest and Mississippi-Atchafalaya-Red River basins ), whereas terrestrial sources are dominant (greater than 60 percent) in all other regions (North Atlantic, South Atlantic-Gulf, California, Texas-Gulf, and Great Lakes).

  2. Drawdown and stream depletion produced by pumping in the vicinity of a partially penetrating stream

    USGS Publications Warehouse

    Butler, J.J., Jr.; Zlotnik, V.A.; Tsou, M.-S.

    2001-01-01

    Commonly used analytical approaches for estimation of pumping-induced drawdown and stream depletion are based on a series of idealistic assumptions about the stream-aquifer system. A new solution has been developed for estimation of drawdown and stream depletion under conditions that are more representative of those in natural systems (finite width stream of shallow penetration adjoining an aquifer of limited lateral extent). This solution shows that the conventional assumption of a fully penetrating stream will lead to a significant overestimation of stream depletion (> 100 %) in many practical applications. The degree of overestimation will depend on the value of the stream leakance parameter and the distance from the pumping well to the stream. Although leakance will increase with stream width, a very wide stream will not necessarily be well represented by a model of a fully penetrating stream. The impact of lateral boundaries depends upon the distance from the pumping well to the stream and the stream leakance parameter. In most cases, aquifer width must be on the order of hundreds of stream widths before the assumption of a laterally infinite aquifer is appropriate for stream-depletion calculations. An important assumption underlying this solution is that stream-channel penetration is negligible relative to aquifer thickness. However, an approximate extension to the case of nonnegligible penetration provides reasonable results for the range of relative penetrations found in most natural systems (up to 85%). Since this solution allows consideration of a much wider range of conditions than existing analytical approaches, it could prove to be a valuable new tool for water management design and water rights adjudication purposes.

  3. Living liquid crystals

    PubMed Central

    Zhou, Shuang; Sokolov, Andrey; Lavrentovich, Oleg D.; Aranson, Igor S.

    2014-01-01

    Collective motion of self-propelled organisms or synthetic particles, often termed active fluid, has attracted enormous attention in the broad scientific community because of its fundamentally nonequilibrium nature. Energy input and interactions among the moving units and the medium lead to complex dynamics. Here, we introduce a class of active matterliving liquid crystals (LLCs)that combines living swimming bacteria with a lyotropic liquid crystal. The physical properties of LLCs can be controlled by the amount of oxygen available to bacteria, by concentration of ingredients, or by temperature. Our studies reveal a wealth of intriguing dynamic phenomena, caused by the coupling between the activity-triggered flow and long-range orientational order of the medium. Among these are (i) nonlinear trajectories of bacterial motion guided by nonuniform director, (ii) local melting of the liquid crystal caused by the bacteria-produced shear flows, (iii) activity-triggered transition from a nonflowing uniform state into a flowing one-dimensional periodic pattern and its evolution into a turbulent array of topological defects, and (iv) birefringence-enabled visualization of microflow generated by the nanometers-thick bacterial flagella. Unlike their isotropic counterpart, the LLCs show collective dynamic effects at very low volume fraction of bacteria, on the order of 0.2%. Our work suggests an unorthodox design concept to control and manipulate the dynamic behavior of soft active matter and opens the door for potential biosensing and biomedical applications. PMID:24474746

  4. Living Liquid Crystals

    E-print Network

    Zhou, Shuang; Lavrentovich, Oleg D; Aranson, Igor S

    2013-01-01

    Collective motion of self-propelled organisms or synthetic particles often termed active fluid has attracted enormous attention in broad scientific community because of it fundamentally non-equilibrium nature. Energy input and interactions among the moving units and the medium lead to complex dynamics. Here we introduce a new class of active matter, living liquid crystals (LLCs) that combine living swimming bacteria with a lyotropic liquid crystal. The physical properties of LLCs can be controlled by the amount of oxygen available to bacteria, by concentration of ingredients, or by temperature. Our studies reveal a wealth of new intriguing dynamic phenomena, caused by the coupling between the activity-triggered flow and long-range orientational order of the medium. Among these are (a) non-linear trajectories of bacterial motion guided by non-uniform director, (b) local melting of the liquid crystal caused by the bacteria-produced shear flows, (c) activity-triggered transition from a non-flowing uniform state ...

  5. RACE AS LIVED EXPERIENCE

    PubMed Central

    Garcia, John A.; Sanchez, Gabriel R.; Sanchez-Youngman, Shannon; Vargas, Edward D.; Ybarra, Vickie D.

    2015-01-01

    A growing body of social science research has sought to conceptualize race as a multidimensional concept in which context, societal relations, and institutional dynamics are key components. Utilizing a specially designed survey, we develop and use multiple measures of race (skin color, ascribed race, and discrimination experiences) to capture race as lived experience and assess their impact on Latinos self-rated health status. We model these measures of race as a lived experience to test the explanatory power of race, both independently and as an integrated scale with categorical regression, scaling, and dimensional analyses. Our analyses show that our multiple measures of race have significant and negative effects on Latinos self-reported health. Skin color is a dominant factor that impacts self-reported health both directly and indirectly. We then advocate for the utilization of multiple measures of race, adding to those used in our analysis, and their application to other health and social outcomes. Our analysis provides important contributions across a wide range of health, illness, social, and political outcomes for communities of color. PMID:26681972

  6. Empirical Evaluation of the Congestion Responsiveness of RealPlayer Video Streams

    E-print Network

    Claypool, Mark

    on-demand. Web sites today offer streaming videos of news broadcasts, music television, live sporting. In this work, we evaluate the responsiveness of RealNetworks' RealVideo over UDP by measuring the per- formance at about 0.1 Mbps1, VCR qual- ity videos at about 1.2 Mbps2, broadcast quality videos at about 2-4 Mbps3

  7. Sketching, streaming, and sub-linear space algorithms

    E-print Network

    Reif, Rafael

    Sketching, streaming, and sub-linear space algorithms Piotr Indyk MIT (currently at Rice U) #12;Data Streams A data stream is a sequence of data that is too large to be stored in available memory databases Scientific data streams ...and this talk #12;Outline Data stream model, motivations

  8. Streaming Instability in Growing Cell Populations William Mather,1

    E-print Network

    Tsimring, Lev S.

    Streaming Instability in Growing Cell Populations William Mather,1 Octavio Mondragon-Palomino,1 growing as a quasimonolayer in a confined space can exhibit streaming, with narrow streams of fast the streaming instability. Our analysis demonstrates that streaming can be explained by the interplay between

  9. Stream Feeds -An Abstraction for the World Wide Sensor Web

    E-print Network

    Whitehouse, Kamin

    "play" and "pause" on streaming media objects. feed streaming media PULL PUSH filter filter stream feed feeds (left) only support a PULL abstraction while streaming media (mid- dle) only supports a PUSH will want real-time updates, similar to a media stream. Furthermore, many clients will only want a small

  10. Physical Stream Habitat Dynamics in Lower Bear Creek, Northern Arkansas

    USGS Publications Warehouse

    Reuter, Joanna M.; Jacobson, Robert B.; Elliott, Caroline M.

    2003-01-01

    We evaluated the roles of geomorphic and hydrologic dynamics in determining physical stream habitat in Bear Creek, a stream with a 239 km2 drainage basin in the Ozark Plateaus (Ozarks) in northern Arkansas. During a relatively wet 12-month monitoring period, the geomorphology of Bear Creek was altered by a series of floods, including at least four floods with peak discharges exceeding a 1-year recurrence interval and another flood with an estimated 2- to 4-year recurrence interval. These floods resulted in a net erosion of sediment from the study reach at Crane Bottom at rates far in excess of other sites previously studied in the Ozarks. The riffle-pool framework of the study reach at Crane Bottom was not substantially altered by these floods, but volumes of habitat in riffles and pools changed. The 2- to 4-year flood scoured gravel from pools and deposited it in riffles, increasing the diversity of available stream habitat. In contract, the smaller floods eroded gravel from the riffles and deposited it in pools, possibly flushing fine sediment from the substrate but also decreasing habitat diversity. Channel geometry measured at the beginning of the study was use to develop a two-dimensional, finite-element hydraulic model at assess how habitat varies with hydrologic dynamics. Distributions of depth and velocity simulated over the range of discharges observed during the study (0.1 to 556 cubic meters per second, cms) were classified into habitat units based on limiting depths and Froude number criteria. The results indicate that the areas of habitats are especially sensitive to change to low to medium flows. Races (areas of swift, relatively deep water downstream from riffles) disappear completely at the lowest flows, and riffles (areas of swift, relatively shallow water) contract substantially in area. Pools also contract in area during low flow, but deep scours associated with bedrock outcrops sustain some pool area even at the lowest modeled flows. Modeled boundary shear stresses were used to evaluate which flows are responsible for the most mobilization of the bed, and therefore, habitat maintenance. Evaluation of the magnitude and frequency of bed-sediment entrainment shows that most of the habitat maintenance results from flows that occur on average about 4 to 7 days a year. Our analysis documents the geomorphic and hydrologic dynamics that form and maintain habitats in a warmwater stream in the Ozarks. The range of flows that occurs on this stream can be partitioned into those that sustain habitat by providing the combinations of depth and velocity that stream organisms live with most of the time, and those flows that surpass sediment entrainment thresholds, alter stream geomorphology, and therefore maintain habitat. The quantitative relations show sensitivity of habitats to flow variation, but do not address how flow may vary in the future, or the extent to which stream geomorphology may be affected by variations in sediment supply.

  11. Streaming Multiframe Deconvolutions on GPUs

    NASA Astrophysics Data System (ADS)

    Lee, M. A.; Budavri, T.

    2015-09-01

    Atmospheric turbulence distorts all ground-based observations, which is especially detrimental to faint detections. The point spread function (PSF) defining this blur is unknown for each exposure and varies significantly over time, making image analysis difficult. Lucky imaging and traditional co-adding throws away lots of information. We developed blind deconvolution algorithms that can simultaneously obtain robust solutions for the background image and all the PSFs. It is done in a streaming setting, which makes it practical for large number of big images. We implemented a new tool that runs of GPUs and achieves exceptional running times that can scale to the new time-domain surveys. Our code can quickly and effectively recover high-resolution images exceeding the quality of traditional co-adds. We demonstrate the power of the method on the repeated exposures in the Sloan Digital Sky Survey's Stripe 82.

  12. SmartCapture: a compact video capture, encoding and streaming technology for UAVs

    NASA Astrophysics Data System (ADS)

    Dai, Wei; Topiwala, Pankaj

    2008-04-01

    Live surveillance video is increasingly in demand on the battlefield to achieve Information Dominance, a critical DoD doctrine established long ago. With the increasing data transmit rate and range of the wireless device and development of Multi-hop Mobile Ad-hoc Network (MANet), real-time live video streaming from UAVs to the ground stations will move forward rapidly. UAVs of every size and shape are currently being formulated and fielded at breathtaking pace, some of them no bigger than paper planes. State-of-the-art video compression and transmission technology will be needed to achieve real-time transmission of the on-board sensors. This paper demonstrates a highly compact video capture and encoding technology for UAVs - SmartCapture. FastVDO SmartCapture is an USB-based capture and encoder device, which ingests NTSC/PAL analog audio/video, and outputs compressed MP4-formatted multimedia via USB 2.0. The captured video/audio is compressed using H.264/AAC, today's leading commercial standards. The highly compressed bit streams make live video streaming possible.

  13. Satellite imagery of the onset of streaming flow of ice streams C and D, West Antarctica

    USGS Publications Warehouse

    Hodge, S.M.; Doppelhammer, S.K.

    1996-01-01

    Five overlapping Landsat multispectral scanner satellite images of the interior of the West Antarctic ice sheet were enhanced with principal component analysis, high-pass filtering, and linear contrast stretching and merged into a mosaic by aligning surface features in the overlap areas. The mosaic was registered to geodetic coordinates, to an accuracy of about 1 km, using the five scene centers as control points. The onset of streaming flow of two tributaries of ice stream C and one tributary of ice stream D is visible in the mosaic. The onset appears to occur within a relatively short distance, less than the width of the ice stream, typically at a subglacial topographic feature such as a step or ridge. The ice streams extend farther up into the interior than previously mapped. Ice stream D starts about 150 km from the ice divide, at an altitude of about 1500 m, approximately halfway up the convex-upward dome shape of the interior ice sheet. Ice stream D is relatively much longer than ice stream C, possibly because ice stream D is currently active whereas ice stream C is currently inactive. The grounded portion of the West Antarctic ice sheet is perhaps best conceptualized as an ice sheet in which ice streams are embedded over most of its area, with slow moving ice converging into fast moving ice streams in a widely distributed pattern, much like that of streams and rivers in a hydrologic basin. A relic margin appears to parallel most of the south margin of the tributary of ice stream D, separated from the active shear margin by about 10 km or less for a distance of over 200 km. This means there is now evidence for recent changes having occurred in three of the five major ice streams which drain most of West Antarctica (B, C, and D), two of which (B and D) are currently active.

  14. INDICATORS OF HYDROLOGIC PERMANENCE IN HEADWATER STREAMS

    EPA Science Inventory

    Headwater intermittent streams lie at the aquatic-terrestrial interface and represent much of our nation's stream miles. Recent court cases concerning the definition of jurisdictional waters under the Clean Water Act have illuminated a need to better understand the characteristi...

  15. Incomplete Mixing in a Small, Urban stream

    NASA Astrophysics Data System (ADS)

    Ryan, R. J.; Boufadel, M. C.

    2006-05-01

    Conservative solute tracer experiments were conducted in Indian Creek, a small urban stream located in Philadelphia, Pennsylvania, USA. Estimated flow rates were between 46 L s-1 and 81 L s-1, average stream width was 5.5 m and average stream depth was 0.2 m. Given these dimensions, most researchers would think it reasonable to assume that the stream is completely mixed vertically and horizontally. However, we found that the stream was not vertically completely mixed in a 0.95 m deep, 30 m long pool. The limited mixing was demonstrated by the vertical stratification of a tracer cloud which was completely mixed both laterally and vertically across the stream prior to entering the pool. We suggest that the cause of limited mixing is due to a balance between groundwater inflow and transverse dispersion at the cross section. We show that the unsupported assumption of complete mix may result in a wide range, and thus increased uncertainty, of the values of stream flow and longitudinal dispersion coefficient estimated from these data. We conclude that the assumption of complete mix and one-dimensional modeling must be checked against actual field conditions, even in small streams.

  16. Mining Sequential Patterns from Temporal Streaming Data

    E-print Network

    Malerba, Donato

    Mining Sequential Patterns from Temporal Streaming Data A. Marascu and F. Masseglia INRIA Sophia.Marascu,Florent.Masseglia}@sophia.inria.fr Abstract. In recent years, emerging applications introduced new con- straints for data mining methods of our knowledge, no method has been proposed for mining sequential patterns in data streams. We argue

  17. The Pal 5 Star Stream Gaps

    NASA Astrophysics Data System (ADS)

    Carlberg, R. G.; Grillmair, C. J.; Hetherington, Nathan

    2012-11-01

    Pal 5 is a low-mass, low-velocity-dispersion, globular cluster with spectacular tidal tails. We use the Sloan Digital Sky Survey Data Release 8 data to extend the density measurements of the trailing star stream to 23 deg distance from the cluster, at which point the stream runs off the edge of the available sky coverage. The size and the number of gaps in the stream are measured using a filter which approximates the structure of the gaps found in stream simulations. We find 5 gaps that are at least 99% confidence detections with about a dozen gaps at 90% confidence. The statistical significance of a gap is estimated using bootstrap resampling of the control regions on either side of the stream. The density minimum closest to the cluster is likely the result of the epicyclic orbits of the tidal outflow and has been discounted. To create the number of 99% confidence gaps per unit length at the mean age of the stream requires a halo population of nearly a thousand dark matter sub-halos with peak circular velocities above 1 km s-1 within 30 kpc of the galactic center. These numbers are a factor of about three below cold stream simulation at this sub-halo mass or velocity but, given the uncertainties in both measurement and more realistic warm stream modeling, are in substantial agreement with the LCDM prediction.

  18. Streaming, Absenteeism, and Dropping-Out.

    ERIC Educational Resources Information Center

    Crespo, Manual; Michelena, Justo

    1981-01-01

    Crosstabular analysis tends to show that the streaming system is inversely related to absenteeism and dropping-out, even when intelligence, age, academic performance, and type of school are considered separately. A path analytic model conforms to the crosstabular analysis. The streaming system remains associated with both absenteeism and

  19. COHO SALMON DEPENDENCE ON INTERMITTENT STREAMS

    EPA Science Inventory

    In February 2006, the US Supreme Court heard cases that may affect whether intermittent streams are jurisdictional waters under the Clean Water Act. In June 2006, however, the cases were remanded to the circuit court, leaving the status of intermittent streams uncertain once agai...

  20. COMPARTMENTAL MODEL OF NITRATE RETENTION IN STREAMS

    EPA Science Inventory

    A compartmental modeling approach is presented to route nitrate retention along a cascade of stream reach sections. A process transfer function is used for transient storage equations with first order reaction terms to represent nitrate uptake in the free stream, and denitrifica...

  1. Stabilization of tokamak plasma by lithium streams

    SciTech Connect

    L.E. Zakharov

    2000-08-07

    The stabilization theory of free-boundary magnetohydrodynamic instabilities in tokamaks by liquid lithium streams driven by magnetic propulsion is formulated. While the conventional, wall-locked, resistive wall mode can be well suppressed by the flow, a new, stream-locked mode determines the limits of the flow stabilization.

  2. GAPS IN THE GD-1 STAR STREAM

    SciTech Connect

    Carlberg, R. G.; Grillmair, C. J. E-mail: carl@ipac.caltech.edu

    2013-05-10

    GD-1 is a long, thin, Milky Way star stream that has readily visible density variations along its length. We quantify the locations, sizes, and statistical significance of the density structure, i.e., gaps, using a set of scaled filters. The shapes of the filters are based on the gaps that develop in simulations of dark matter sub-halos crossing a star stream. The high Galactic latitude 8.4 kpc long segment of GD-1 that we examine has 8 {+-} 3 gaps of 99% significance or greater, with the error estimated on the basis of tests of the gap-filtering technique. The cumulative distribution of gaps more than three times the width of the stream is in good agreement with predictions for dark matter sub-halo encounters with cold star streams. The number of gaps narrower than three times the width of the GD-1 stream falls well below the cold stream prediction which is taken into account for the gap creation rate integrated over all sizes. Simple warm stream simulations scaled to GD-1 show that the falloff in gaps is expected for sub-halos below a mass of 10{sup 6} M{sub Sun }. The GD-1 gaps requires 100 sub-halos >10{sup 6} M{sub Sun} within 30 kpc, the apocenter of GD-1 orbit. These results are consistent with LCDM sub-halo predictions but further improvements in stream signal-to-noise and gap modeling will be welcome.

  3. The Gulf Stream and Density of Fluids

    ERIC Educational Resources Information Center

    Landstrom, Erich

    2006-01-01

    A few kilometers from the shores of Palm Beach County, Florida, is the Gulf Stream current--a remarkable "river" within an ocean. The current's journey across the Atlantic Ocean connects southeast Florida and southwest Great Britain as it streams steadily north at speeds of 97 km a day; moving 100 times as much water as all the rivers on Earth.

  4. Ecosystem Services Provided by Stream Fishes

    EPA Science Inventory

    Stream fish provide important services to people, including recreation and food, regulation of ecosystem processes, and aesthetic benefits. If the services provided by fish in different streams can be measured, then they can be valued and considered in restoration decisions. We...

  5. Streams-C Scheduler and Library

    Energy Science and Technology Software Center (ESTSC)

    2001-12-04

    The scheduler accepts a preprocessed C program with optional Streams-C extensions. It translates it to a normalized form with additional information for scheduling it on a reconfigurable architecture. The resulting file is accepted by the Streams-C VHDL generator, not part of this package.

  6. MODELING STREAM CHANNEL ADJUSTMENT TO WOODY VEGETATION

    Technology Transfer Automated Retrieval System (TEKTRAN)

    River restoration and bank stabilization programs often use vegetation for improving stream corridor habitat, aesthetic, and function. Yet no study has examined the use of managed vegetation plantings to transform a straight, degraded stream corridor into a more functional, aesthetically-pleasing m...

  7. MECHANICS OF STREAM-BORNE WOODY DEBRIS

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Large woody debris is increasingly regarded as an integral component of stream stabilization and restoration programs. Unravelling the dynamics of complex interaction of multiple logs among themselves and with the stream environs must start with a correct specification of all the forces acting on i...

  8. Using Queuing Theory to Model Streaming Applications

    E-print Network

    Chamberlain, Roger

    by constructing a Jacksonian queuing network model of a streaming implementation of BLAST deployed on modeling Mercury BLAST [2], [3], an accelerated BLAST that combines general-purpose processors and FPGAsUsing Queuing Theory to Model Streaming Applications Rahav Dor Joseph M. Lancaster Mark A. Franklin

  9. National River and Stream Assessment Monitoring Design

    EPA Science Inventory

    The USEPA designed the National River and Stream Assessment (NRSA) in 2007 and field sampling was completed in 2008-9. The objective of the assessment is to estimate the ecological condition of river and streams nationally. This paper describes the national survey design and re...

  10. Streaming for Mathematics in Victorian Secondary Schools

    ERIC Educational Resources Information Center

    Forgasz, Helen

    2010-01-01

    Streaming (or ability grouping) for mathematics learning is a contentious issue. It can also be considered an issue of equity or social justice as some students may be adversely affected by the practice. Currently, the Victorian Department of Education and Early Childhood Development (DEECD) does not appear to have clear guidelines on streaming.

  11. Conundrum of the Large Scale Streaming

    E-print Network

    T. M. Malm

    1999-09-12

    The etiology of the large scale peculiar velocity (large scale streaming motion) of clusters would increasingly seem more tenuous, within the context of the gravitational instability hypothesis. Are there any alternative testable models possibly accounting for such large scale streaming of clusters?

  12. Effects of Context on Auditory Stream Segregation

    ERIC Educational Resources Information Center

    Snyder, Joel S.; Carter, Olivia L.; Lee, Suh-Kyung; Hannon, Erin E.; Alain, Claude

    2008-01-01

    The authors examined the effect of preceding context on auditory stream segregation. Low tones (A), high tones (B), and silences (-) were presented in an ABA-pattern. Participants indicated whether they perceived 1 or 2 streams of tones. The A tone frequency was fixed, and the B tone was the same as the A tone or had 1 of 3 higher frequencies.

  13. Terrestrial and in-stream influences on the spatial variability of nitrate in a forested headwater catchment

    NASA Astrophysics Data System (ADS)

    Scanlon, Todd M.; Ingram, Spencer M.; Riscassi, Ami L.

    2010-06-01

    A vast majority of monitoring programs designed to assess nutrient fluxes from headwater systems rely upon temporally intensive sampling at a single position within the stream network, essentially measuring the integrated response of the catchment. Missing from such an approach is spatial information related to how nutrient availability varies throughout the network, where freshwater biota live and where biogeochemical processes ultimately shape the downstream water chemistry. Here, we examine the spatial distribution of nitrate (NO3-) concentrations within the Paine Run catchment, a forested headwater catchment in Shenandoah National Park, Virginia. Nitrate concentrations throughout the stream network were measured as part of synoptic surveys conducted in 1992-1994, in the aftermath of region-wide gypsy moth defoliation that caused dramatic increases in stream water NO3- concentrations. A follow-up synoptic survey was conducted in 2007, when the stream water NO3- concentrations had returned to predefoliation levels. Common to each of the eight synoptic surveys were observations of multiple-fold declines in NO3- concentration along the main stem of the stream network from the headwaters to the catchment outlet. A portion of this decline was caused by dilution, as water input by tributaries at the lower elevations of the catchment tended to have lower NO3- concentrations. A stream network model was applied to determine the relative contributions of terrestrial versus in-stream processes to the spatial variability of the NO3- concentrations. Model results suggest that even though nitrate removal within the stream network can be substantial, terrestrial factors that determine the NO3- inputs to streams account for the vast majority of the spatial variability in stream water NO3- concentrations.

  14. Living With Semantic Dementia

    PubMed Central

    Sage, Karen; Wilkinson, Ray; Keady, John

    2014-01-01

    Semantic dementia is a variant of frontotemporal dementia and is a recently recognized diagnostic condition. There has been some research quantitatively examining care partner stress and burden in frontotemporal dementia. There are, however, few studies exploring the subjective experiences of family members caring for those with frontotemporal dementia. Increased knowledge of such experiences would allow service providers to tailor intervention, support, and information better. We used a case study design, with thematic narrative analysis applied to interview data, to describe the experiences of a wife and son caring for a husband/father with semantic dementia. Using this approach, we identified four themes: (a) living with routines, (b) policing and protecting, (c) making connections, and (d) being adaptive and flexible. Each of these themes were shared and extended, with the importance of routines in everyday life highlighted. The implications for policy, practice, and research are discussed. PMID:24532121

  15. Freezing of living cells

    SciTech Connect

    Mazur, P.

    1985-01-01

    It can be calculated that a living cell will survive more than 5000 years at -196/sup 0/C. This ability to essentially stop biological time has important implications in medicine and agriculture, and in biological research. In medicine the chief implications are in the banking of transplantable tissues and organs and in in vitro fertilization. In agriculture the applications stem in part from the role of frozen embryos in amplifying the number of calves produced by high quanlity cows. The problem is how can cells survive both the cooling to such very low temperatures and the return to normal temperatures. The answers involve fundamental characteristics of cells such as the permeability of their surface membranes to water and solutes. These characteristics determine whether or not cells undergo lethal internal ice formation and other response during freezing and thawing. 27 refs., 12 figs.

  16. The thermomechanics of ice-stream margins

    NASA Astrophysics Data System (ADS)

    Suckale, Jenny; Elsworth, Cooper; Platt, John; Perol, Thibaut; Rice, James

    2015-04-01

    The mass balance of the West Antarctic ice sheet depends primarily on the location and flow speed of arterial drainage routes called ice streams, which represent localized zones of rapid ice flow separated by ridges of comparatively stagnant ice. Our understanding of ice-stream dynamics and our ability to predict the flow velocity and configuration of ice streams in light of changing environmental conditions, however, is incomplete. One main challenge in current models of ice streams is the treatment of the shear margin, which plays an important role in the force balance of an active ice stream. The lack of a clear correlation between topography and ice-stream location on the Ross ice shelf in combination with observations of migrating ice-stream margins suggest that a physical mechanism must exist that determines the location of the margin and the flow speed of the stream self-consistently. Three possible mechanisms are the transition from a frozen to a temperate bed in the shear margin, the formation of a subglacial drainage channel or the existence of sticky spots. The goal of this study is to test whether and how these three mechanisms contribute to ice-stream dynamics. We propose a 2D thermo-mechanical model representing a cross-section through the ice-stream margin perpendicular to the downstream flow direction. We assume that the ice flows over a bed consisting of Coulomb-plastic till. The position and extent of the ice stream is determined by where the shear stress at the bed attains the local and spatially variable yield stress. If the basal stress falls below the yield stress, the ice is assumed to lock to the bed. While a simplified variation of this model setup can be solved analytically, we adopt a numerical treatment to be able to incorporate a realistic ice rheology. We validate our numerical approach both against previous analytical solutions and against observations. We find that the rapid velocity increase across the shear margins of the active ice streams is indicative of a temperate zone at depth, where the heat production from lateral shear is most intense. A transition from a temperate to a frozen bed or the existence of drainage channels may both play an important role in the dynamics of active ice streams, but are probably less important close to the initiation region. All three mechanisms, however, are prone to instability suggesting that the ice streams on the Ross ice shelf might be in a precarious balance.

  17. Geomorphic applications of stream-gage information

    USGS Publications Warehouse

    Juracek, K.E.; Fitzpatrick, F.A.

    2009-01-01

    In the United States, several thousand stream gages provide what typically is the only source of continuous, long-term streamflow and channel-geometry information for the locations being monitored. In this paper, the geomorphic content of stream-gage information, previous and potential applications of stream-gage information in fluvial geomorphic research and various possible limitations are described. Documented applications include studies of hydraulic geometry, channel bankfull characteristics, sediment transport and channel geomorphic response to various types of disturbance. Potential applications include studies to determine the geomorphic effectiveness of large floods and in-stream habitat change in response to disturbance. For certain applications, various spatial, temporal and data limitations may render the stream-gage information of limited use; however, such information often is of considerable value to enable or enhance geomorphic investigations.

  18. Stream dynamics at pipeline river crossings

    SciTech Connect

    Beckstead, G.R.E.; Cavers, D.S.

    1996-12-31

    Pipeline crossings of streams, whether large or small, must consider the ability of the stream channel to scour its bed and erode its banks. Case studies are presented to illustrate the kinds of dynamic environments which must be considered in designing pipeline stream crossings. These characteristics may be determined through the use of comparative historical aerial photography and site photographs and surveys. The case studies presented as examples in this paper include gullies, bedrock-lined channels, entrenched meandering streams, multi-channel wandering streams, degrading channels, alluvial fans, and major channels affected by regulation and man-made structures. Natural hazards such as debris jams and beaver dams are also discussed. For each case study, the characteristics of the channels are described, the design approach discussed and site-specific constraints presented which affected the final design.

  19. The composition of corotating energetic particle streams

    NASA Technical Reports Server (NTRS)

    Mcguire, R. E.; Von Renvinge, T. T.; Mcdonald, F. B.

    1978-01-01

    The relative abundances of 1.5 to 23 MeV/nucleon ions in corotating nucleon streams were compared with ion abundances in particle events associated with solar flares and with solar and solar wind abundances. He/O and C/O ratios were found to be a factor of the order two to three times greater in corotating streams than in flare associated events. The distribution of H/He ratios in corotating streams was found to be much narrower and of lower average value than in flare associated events. H/He in corotating energetic particle streams compared favorably both in lack of variability and numerical value to H/He in high speed solar wind plasma streams. This comparison suggested that the source population for the corotating energetic particles was the solar wind.

  20. Comet Machholz and the Quadrantid meteor stream

    NASA Astrophysics Data System (ADS)

    Jones, J.; Jones, W.

    1993-04-01

    Until quite recently, the Quadrantid meteor stream was considered to be an 'orphan'. Because of the difficulty in accounting for the large difference in the longitudes of the ascending nodes, McIntosh (1990) suggested that Comet Machholz and the stream have a sibling rather than a parent-child relationship. Gonczi et al. (1992) proposed that gravitational perturbations by Jupiter may be amplified sufficiently by the 2:1 resonance of the stream with Jupiter to explain the difference in the longitudes of ascending nodes if the stream was born when the comet's perihelion distance was last at its minimum about 4000 yr ago. In this paper, we show by computer simulations that, if the comet was captured at its last close approach with Jupiter about 2200 yr ago, there has been sufficient time for the resulting stream to produce most of the features of the presently observed Quadrantid/Arietid/Southern Delta-Aquarid complex.

  1. In-stream Escherichia coli Modeling

    NASA Astrophysics Data System (ADS)

    Pandey, P.; Soupir, M.

    2013-12-01

    Elevated levels of pathogenic bacteria indicators such as Escherichia coli (E. coli) in streams are a serious concern. Controlling E. coli levels in streams requires improving our existing understanding of fate and transport of E. coli at watershed scale. In-stream E. coli concentrations are potentially linked to non-point pollution sources (i.e., agricultural land). Water of a natural stream can receive E. coli by either through overland flow (via runoff from cropland) or resuspension from the streambed to the water column. Calculating in-stream total E. coli loads requires estimation of particle attached bacteria as well free floating E. coli transport. Currently water quality models commonly used for predicting E. coli levels in stream water have limited capability for predicting E. coli levels in the water column as well as in the streambed sediment. The challenges in calculating in-stream E. coli levels include difficulties in modeling the complex interactions between sediment particles and E. coli. Here we have developed a watershed scale model (integrated with Soil and Water Assessment Tool (SWAT)), which involves calculation of particle attached E. coli, to predict in-stream E. coli concentrations. The proposed model predicts E. coli levels in streambed bed sediment as well as in the water column. An extensive in-stream E. coli monitoring was carried out to verify the model predictions, and results indicate that the model performed well. The study proposed here will improve understanding on in-stream bacterial contamination, and help improving existing water quality models for predicting pathogenic bacteria levels in ambient water bodies.

  2. Unionville, Pennsylvania School's Stream Restoration Project

    NASA Astrophysics Data System (ADS)

    Madsen, S. M.

    2004-12-01

    For the past three years, students and Earth Club members of C.F. Patton Middle School and Unionville High School have been involved in a stream restoration and monitoring project along a tributary to the East Branch of the Red Clay Creek in Pennsylvania. The Red Clay is within the larger Christina River Basin watershed which drains to Delaware Bay. Total funding of \\$962.00 was awarded by the Unionville-Chadds Ford Education Foundation to purchase both stream monitoring equipment and native plant species for stream restoration. Nine science teachers in the school district received certification in stream monitoring by the Pennsylvania State Parks Division. Certification enables the science faculty and their students to enter monitoring data in a statewide stream database. The stream data includes: temperature, levels of dissolved oxygen and nutrients, pH, alkalinity, conductivity, and a complete biosurvey of invertebrates. In addition to ongoing monitoring, the Earth Club sponsored a name-the-stream contest. Quartz Creek was chosen for this previously unnamed tributary. Its' name was approved by the East Marlborough Township Supervisor in May, 2004 and was then submitted to the USGS' Board on Geographic Names. The Earth Club has also sponsored a stream restoration contest. Students in the middle school were encouraged to design a habitat along the stream banks that would keep sediment in-place, while encouraging wildlife. The stream was originally crowded with invasive multi-flora rose but this was removed with the help of parents and students over a two year period. The winning student poster was outstanding and native species were purchased and planted following the poster's design. The planting took place in May, 2004 with over 40 persons involved including 25 middle school and 8 high school students, teachers from the schools, administrators and employees of the Brandywine Conservancy, and Red Clay Valley and Brandywine Valley Associations, and graduate students from the University of Delaware.

  3. Lagrangian Coherent Structures from Video Streams of Jupiter

    E-print Network

    Alireza Hadjighasem; George Haller

    2014-07-15

    Jupiter's fast rotation - one rotation over 10 hours - creates strong jet streams, smearing its clouds into linear bands of dark and light zonal belts that circle the planet on lines of almost constant latitude. Such a high degree of axisymmetry is absent in our own atmosphere. Moreover, Jupiter has the largest and longest-living known atmospheric vortex, the Great Red Spot (GRS). Such vortices abound in nature, but GRS's size, long-term persistence, and temporal longitudinal oscillations make it unique. Here, we uncover, for the first time, unsteady material structures that form the cores of zonal jets and the boundary of the GRS in Jupiter's atmosphere. We perform our analysis on a velocity field extracted from a video footage acquired by the NASA Cassini spacecraft.

  4. Object-based media and stream-based computing

    NASA Astrophysics Data System (ADS)

    Bove, V. Michael, Jr.

    1998-03-01

    Object-based media refers to the representation of audiovisual information as a collection of objects - the result of scene-analysis algorithms - and a script describing how they are to be rendered for display. Such multimedia presentations can adapt to viewing circumstances as well as to viewer preferences and behavior, and can provide a richer link between content creator and consumer. With faster networks and processors, such ideas become applicable to live interpersonal communications as well, creating a more natural and productive alternative to traditional videoconferencing. In this paper is outlined an example of object-based media algorithms and applications developed by my group, and present new hardware architectures and software methods that we have developed to enable meeting the computational requirements of object- based and other advanced media representations. In particular we describe stream-based processing, which enables automatic run-time parallelization of multidimensional signal processing tasks even given heterogenous computational resources.

  5. More of the Same: High Functional Redundancy in Stream Fish Assemblages from Tropical Agroecosystems

    NASA Astrophysics Data System (ADS)

    Casatti, Lilian; Teresa, Fabrcio Barreto; Zeni, Jaquelini de Oliveira; Ribeiro, Mariela Domiciano; Brejo, Gabriel Loureno; Ceneviva-Bastos, Mnica

    2015-06-01

    In this study, we investigated the influence of environmental variables (predictor variables) on the species richness, species diversity, functional diversity, and functional redundancy (response variables) of stream fish assemblages in an agroecosystem that harbor a gradient of degradation. We hypothesized that, despite presenting high richness or diversity in some occasions, fish communities will be more functionally redundant with stream degradation. Species richness, species diversity, and functional redundancy were predicted by the percentage of grass on the banks, which is a characteristic that indicates degraded conditions, whereas the percentage of coarse substrate in the stream bottom was an important predictor of all response variables and indicates more preserved conditions. Despite being more numerous and diverse, the groups of species living in streams with an abundance of grass on the banks perform similar functions in the ecosystem. We found that riparian and watershed land use had low predictive power in comparison to the instream habitat. If there is any interest in promoting ecosystem functions and fish diversity, conservation strategies should seek to restore forests in watersheds and riparian buffers, protect instream habitats from siltation, provide wood debris, and mitigate the proliferation of grass on stream banks. Such actions will work better if they are planned together with good farming practices because these basins will continue to be used for agriculture and livestock in the future.

  6. Biological Conditions in Streams of Johnson County, Kansas, and Nearby Missouri, 2003 and 2004

    USGS Publications Warehouse

    Poulton, Barry C.; Rasmussen, Teresa J.; Lee, Casey J.

    2007-01-01

    Johnson County is one of the fastest growing and most populated counties in Kansas. Urban development affects streams by altering stream hydrology, geomorphology, water chemistry, and habitat, which then can lead to adverse effects on fish and macroinvertebrate communities. In addition, increasing sources of contaminants in urbanizing streams results in public-health concerns associated with exposure to and consumption of contaminated water. Biological assessments, or surveys of organisms living in aquatic environments, are crucial components of water-quality programs because they provide an indication of how well water bodies support aquatic life. This fact sheet describes current biological conditions of Johnson County streams and characterizes stream biology relative to urban development. Biological conditions were evaluated by collecting macroinvertebrate samples from 15 stream sites in Johnson County, Kansas, in 2003 and 2004 (fig. 1). Data from seven additional sites, collected as part of a separate study with similar objectives in Kansas and Missouri (Wilkison and others, 2005), were evaluated to provide a more comprehensive assessment of watersheds that cross State boundaries. Land-use and water- and streambed-sediment-quality data also were used to evaluate factors that may affect macroinvertebrate communities. Metrics are indices used to measure, or evaluate, macroinvertebrate response to various factors such as human disturbance. Multimetric scores, which integrated 10 different metrics that measure various aspects of macroinvertebrate communities, including organism diversity, composition, tolerance, and feeding characteristics, were used to evaluate and compare biological health of Johnson County streams. This information is useful to city and county officials for defining current biological conditions, evaluating conditions relative to State biological criteria, evaluating effects of urbanization, developing effective water-quality management plans, and documenting changes in biological conditions and water quality.

  7. APPLIED ISSUES Effects of stream restoration and wastewater treatment

    E-print Network

    Hershey, Anne

    APPLIED ISSUES Effects of stream restoration and wastewater treatment plant effluent on fish downstream of urbanisation, which was impacted by effluent from a wastewater treatment plant (WWTP). Stream, terrestrial versus aquatic food resources, urban streams, wastewater treatment plant influences Introduction

  8. Compiler optimizations for an asynchronous stream-oriented programming language

    E-print Network

    Craig, Michael B

    2008-01-01

    Stream-oriented programs allow different opportunities for optimization than procedural programs. Moreover, as compared to purely synchronous stream-oriented programs, optimizing for asynchronous stream-based programs is ...

  9. Job Admission and Resource Allocation in Distributed Streaming Systems

    E-print Network

    Feitelson, Dror

    -scale data stream processing jobs. This area of research is relatively new. Early examples include Borealis, TelegraphCQ, STREAM, StreamBase and Aurora [1,3,5,15,23]. These systems mostly take relational model

  10. Effects of urbanization on stream channel morpology, Madisonville, Texas

    E-print Network

    Harris, Daniel Lee

    2002-01-01

    This thesis investigates the effects of urban development on two small streams near Madisonville, Texas. One stream is natural and used as a control against which Town Branch, the urbanized stream, is compared. Changes in width, depth, and channel...

  11. Acoustofluidics 14: Applications of acoustic streaming in microfluidic devices

    E-print Network

    Acoustofluidics 14: Applications of acoustic streaming in microfluidic devices Martin Wiklund ``Acoustofluidics exploiting ultrasonic standing wave forces and acoustic streaming in microfluidic systems for cell and particle manipulation'', we provide a qualitative description of acoustic streaming and review

  12. Streaming potential measurements 2. Relationship between electrical and hydraulic flow

    E-print Network

    Avouac, Jean-Philippe

    Streaming potential measurements 2. Relationship between electrical and hydraulic flow patterns Abstract. Streaming potential and resistivity measurements have been performed on Fontainebleau sandstone. Measurements on individual samples do not show any clear intrinsic dependence of the streaming potential

  13. Threshold-Based Media Streaming Optimization for Heterogeneous

    E-print Network

    Sreenan, Cormac J.

    Threshold-Based Media Streaming Optimization for Heterogeneous Wireless Networks Ahmed H. Zahran heterogeneous network. In this paper, we propose a generic practical framework that optimizes media streaming management algorithms and optimization framework. Index Terms--Media streaming algorithm, heterogeneous

  14. Live imaging of GFP-labeled proteins in Drosophila oocytes.

    PubMed

    Pokrywka, Nancy Jo

    2013-01-01

    The Drosophila oocyte has been established as a versatile system for investigating fundamental questions such as cytoskeletal function, cell organization, and organelle structure and function. The availability of various GFP-tagged proteins means that many cellular processes can be monitored in living cells over the course of minutes or hours, and using this technique, processes such as RNP transport, epithelial morphogenesis, and tissue remodeling have been described in great detail in Drosophila oocytes. The ability to perform video imaging combined with a rich repertoire of mutants allows an enormous variety of genes and processes to be examined in incredible detail. One such example is the process of ooplasmic streaming, which initiates at mid-oogenesis. This vigorous movement of cytoplasmic vesicles is microtubule and kinesin-dependent and provides a useful system for investigating cytoskeleton function at these stages. Here I present a protocol for time lapse imaging of living oocytes using virtually any confocal microscopy setup. PMID:23567977

  15. Ecoregions and stream morphology in eastern Oklahoma

    USGS Publications Warehouse

    Splinter, D.K.; Dauwalter, D.C.; Marston, R.A.; Fisher, W.L.

    2010-01-01

    Broad-scale variables (i.e., geology, topography, climate, land use, vegetation, and soils) influence channel morphology. How and to what extent the longitudinal pattern of channel morphology is influenced by broad-scale variables is important to fluvial geomorphologists and stream ecologists. In the last couple of decades, there has been an increase in the amount of interdisciplinary research between fluvial geomorphologists and stream ecologists. In a historical context, fluvial geomorphologists are more apt to use physiographic regions to distinguish broad-scale variables, while stream ecologists are more apt to use the concept of an ecosystem to address the broad-scale variables that influence stream habitat. For this reason, we designed a study using ecoregions, which uses physical and biological variables to understand how landscapes influence channel processes. Ecoregions are delineated by similarities in geology, climate, soils, land use, and potential natural vegetation. In the fluvial system, stream form and function are dictated by processes observed throughout the fluvial hierarchy. Recognizing that stream form and function should differ by ecoregion, a study was designed to evaluate how the characteristics of stream channels differed longitudinally among three ecoregions in eastern Oklahoma, USA: Boston Mountains, Ozark Highlands, and Ouachita Mountains. Channel morphology of 149 stream reaches was surveyed in 1st- through 4th-order streams, and effects of drainage area and ecoregion on channel morphology was evaluated using multiple regressions. Differences existed (?????0.05) among ecoregions for particle size, bankfull width, and width/depth ratio. No differences existed among ecoregions for gradient or sinuosity. Particle size was smallest in the Ozark Highlands and largest in the Ouachita Mountains. Bankfull width was larger in the Ozark Highlands than in the Boston Mountains and Ouachita Mountains in larger streams. Width/depth ratios of the Boston Mountains and Ozark Highlands were not statistically different. Significant differences existed, however, between the Boston Mountains and Ozark Highlands when compared individually to the Ouachita Mountains. We found that ecoregions afforded a good spatial structure that can help in understanding longitudinal trends in stream reach morphology surveyed at the reach scale. The hierarchy of the fluvial system begins within a broad, relatively homogenous setting that imparts control on processes that affect stream function. Ecoregions provide an adequate regional division to begin a large-scale geomorphic study of processes in stream channels. ?? 2010 Elsevier B.V.

  16. Utilizing the Cyberforest live sound system with social media to remotely conduct woodland bird censuses in Central Japan.

    PubMed

    Saito, Kaoru; Nakamura, Kazuhiko; Ueta, Mutsuyuki; Kurosawa, Reiko; Fujiwara, Akio; Kobayashi, Hill Hiroki; Nakayama, Masaya; Toko, Ayako; Nagahama, Kazuyo

    2015-11-01

    We have developed a system that streams and archives live sound from remote areas across Japan via an unmanned automatic camera. The system was used to carry out pilot bird censuses in woodland; this allowed us to examine the use of live sound transmission and the role of social media as a mediator in remote scientific monitoring. The system has been streaming sounds 8h per day for more than fiveyears. We demonstrated that: (1) the transmission of live sound from a remote woodland could be used effectively to monitor birds in a remote location; (2) the simultaneous involvement of several participants via Internet Relay Chat to listen to live sound transmissions could enhance the accuracy of census data collection; and (3) interactions through Twitter allowed members of the public to engage or help with the remote monitoring of birds and experience inaccessible nature through the use of novel technologies. PMID:26508345

  17. Fast algorithm for automatically computing Strahler stream order

    USGS Publications Warehouse

    Lanfear, Kenneth J.

    1990-01-01

    An efficient algorithm was developed to determine Strahler stream order for segments of stream networks represented in a Geographic Information System (GIS). The algorithm correctly assigns Strahler stream order in topologically complex situations such as braided streams and multiple drainage outlets. Execution time varies nearly linearly with the number of stream segments in the network. This technique is expected to be particularly useful for studying the topology of dense stream networks derived from digital elevation model data.

  18. Agresso has Gone Live! Agresso has Gone Live on schedule.

    E-print Network

    Mitchell, Chris

    to MyView. We would like to thank everyone throughout College who has helped to get us this far and lookAgresso has Gone Live! Agresso has Gone Live on schedule. Details of Key Information is on the Go will be made via BACS, reclaiming travel paid by Oyster cards, advances and using your bicycle on College

  19. Lives Worth Living: Religious Education and Social Movements

    ERIC Educational Resources Information Center

    Ayres, Jennifer R.

    2013-01-01

    When people of faith participate in movements for social change, how are their religious and moral identities formed, challenged, and transformed? Although they have explicit and tangible goals as they participate in advocacy, protest, and boycotts, religious social activists also, James Jasper argues, craft "lives worth living" (1997).

  20. Bacteria Marinobacter aquaeolei. Community Living. Microbes living in coral provide

    E-print Network

    Qiu, Bo

    Bacteria Marinobacter aquaeolei. Community Living. Microbes living in coral provide nutrients in Microbial Oceanography Cleaning up. Bacteria are being tested for use as cleaning agents of toxic chemicals microliter of seawater.The big red and green dots (numbering about 1,000) are bacteria, and the very small

  1. Dynamics of stream-subhalo interactions

    E-print Network

    Sanders, Jason L; Erkal, Denis

    2015-01-01

    We develop a formalism for modelling the impact of dark matter subhaloes on cold thin streams. Our formalism models the formation of a gap in a stream in angle-frequency space and is able to handle general stream and impact geometry. We analyse an N-body simulation of a cold stream formed from a progenitor on an eccentric orbit in an axisymmetric potential, which is perturbed by a direct impact from a $10^8 M_\\odot$ subhalo, and produce a complete generative model of the perturbed stream that matches the simulation well at a range of times. We show how the results in angle-frequency space can be related to physical properties of the gaps and that previous results for more constrained simulations are recovered. We demonstrate how our results are dependent upon the mass of the subhalo and the location of the impact along the stream. We find that gaps formed far downstream grow more rapidly than those closer to the progenitor due to the more ordered nature of the stream members far from the progenitor. Additiona...

  2. Ecological health in the Nation's streams

    USGS Publications Warehouse

    Carlisle, Daren M.; Woodside, Michael D.

    2013-01-01

    Aquatic biological communities, which are collections of organisms, are a direct measure of stream health because they indicate the ability of a stream to support life. This fact sheet highlights selected findings of a national assessment of stream health by the National Water-Quality Assessment (NAWQA) Program of the U.S. Geological Survey (USGS). The assessment was unique in that it integrated the condition of three biological communitiesalgae, macroinvertebrates, and fishas well as measures of streamflow modification, pesticides, nutrients, and other factors. At least one biological community was altered at 83 percent of assessed streams, and the occurrence of altered communities was highest in urban streams. Streamflows were modified at 86 percent of assessed streams, and increasing severity of streamflow modification was associated with increased occurrence of altered biological communities. Agricultural and urban land use in watersheds may contribute pesticides and nutrients to stream waters, and increasing concentrations of these chemicals were associated with increased occurrence of altered biological communities.

  3. A Literature Review on Value Stream Mapping with a Case Study of Applying Value Stream Mapping on Research Process

    E-print Network

    Li, Xiaoqi

    2014-04-23

    has two main objectives. The first is an in-depth literature review on value stream mapping, especially concerning useful value stream mapping tools and the application of value stream mapping in construction industry. The literature review of value...

  4. Living Microlens Arrays

    PubMed Central

    Zimberlin, Jessica A.; Wadsworth, Patricia; Crosby, Alfred J.

    2010-01-01

    Both individual cells and sheets of cells exert traction forces on the substrate and these forces have been investigated using a wide range of methods. Here we compare the mechanical properties of fibroblasts and epithelial cells using a novel surface geometry. Living cells are added to a thin film of polystyrene [PS] attached to a substrate of crosslinked poly(dimethyl siloxane) [PDMS] microwells. The contractile nature of the cells attached to the surface and the compliance of the PDMS surface geometry allows the PS thin film to buckle, forming arrays of convex microlenses. The resulting curvature of the microlenses allows us to determine the applied strain of growing cell sheets. We report that a monolayer of epithelial cells exerts more stress on the substrate than fibroblasts and attribute this to the collective behavior of the epithelium. By subsequently adding different chemical triggers to the system, the contractile nature of the cells changes, thus modifying the focal length of the microlenses. Together, these findings demonstrate the importance of studying the mechanics of cell sheets and also introduce a new design paradigm for advanced materials, offering great promise for a range of applications. PMID:18615631

  5. Creating living machines

    PubMed Central

    Kamm, Roger D.; Bashir, Rashid

    2015-01-01

    Development of increasingly complex integrated cellular systems will be a major challenge for the next decade and beyond, as we apply the knowledge gained from the sub-disciplines of tissue engineering, synthetic biology, micro-fabrication and nanotechnology, systems biology, and developmental biology. In this prospective, we describe the current state-of-the-art in the context of differentiating source cells from more primitive, pluripotent cells, and organizing these cells into populations of a single cell type to produce the components or building blocks of higher order systems and finally, combining multiple cell types, possibly in combination with scaffolds possessing specific physical or chemical properties, to produce greater functionality. As these living machines increase in capabilities, exhibit emergent behavior and potentially reveal the ability for self-assembly, self-repair, and even self-replication, questions arise regarding the ethical implications of this work. Future prospects as well as ways of addressing these complex ethical questions will be addressed. PMID:24006130

  6. Time-Based Data Streams: Fundamental Concepts for a Data Resource for Streams

    SciTech Connect

    Beth A. Plale

    2009-10-10

    Real time data, which we call data streams, are readings from instruments, environmental, bodily or building sensors that are generated at regular intervals and often, due to their volume, need to be processed in real time. Often a single pass is all that can be made on the data, and a decision to discard or keep the instance is made on the spot. Too, the stream is for all practical purposes indefinite, so decisions must be made on incomplete knowledge. This notion of data streams has a different set of issues from a file, for instance, that is byte streamed to a reader. The file is finite, so the byte stream is becomes a processing convenience more than a fundamentally different kind of data. Through the duration of the project we examined three aspects of streaming data: the first, techniques to handle streaming data in a distributed system organized as a collection of web services, the second, the notion of the dashboard and real time controllable analysis constructs in the context of the Fermi Tevatron Beam Position Monitor, and third and finally, we examined provenance collection of stream processing such as might occur as raw observational data flows from the source and undergoes correction, cleaning, and quality control. The impact of this work is severalfold. We were one of the first to advocate that streams had little value unless aggregated, and that notion is now gaining general acceptance. We were one of the first groups to grapple with the notion of provenance of stream data also.

  7. Prediction of stream volatilization coefficients

    USGS Publications Warehouse

    Rathbun, Ronald E.

    1990-01-01

    Equations are developed for predicting the liquid-film and gas-film reference-substance parameters for quantifying volatilization of organic solutes from streams. Molecular weight and molecular-diffusion coefficients of the solute are used as correlating parameters. Equations for predicting molecular-diffusion coefficients of organic solutes in water and air are developed, with molecular weight and molal volume as parameters. Mean absolute errors of prediction for diffusion coefficients in water are 9.97% for the molecular-weight equation, 6.45% for the molal-volume equation. The mean absolute error for the diffusion coefficient in air is 5.79% for the molal-volume equation. Molecular weight is not a satisfactory correlating parameter for diffusion in air because two equations are necessary to describe the values in the data set. The best predictive equation for the liquid-film reference-substance parameter has a mean absolute error of 5.74%, with molal volume as the correlating parameter. The best equation for the gas-film parameter has a mean absolute error of 7.80%, with molecular weight as the correlating parameter.

  8. Methods of separating particulate residue streams

    DOEpatents

    Hoskinson, Reed L. (Rigby, ID); Kenney, Kevin L. (Idaho Falls, ID); Wright, Christopher T. (Idaho Falls, ID); Hess, J. Richard (Idaho Falls, ID)

    2011-04-05

    A particulate residue separator and a method for separating a particulate residue stream may include an air plenum borne by a harvesting device, and have a first, intake end and a second, exhaust end; first and second particulate residue air streams that are formed by the harvesting device and that travel, at least in part, along the air plenum and in a direction of the second, exhaust end; and a baffle assembly that is located in partially occluding relation relative to the air plenum and that substantially separates the first and second particulate residue air streams.

  9. Hydrovisbreaking process for hydrocarbon containing feed streams

    SciTech Connect

    Howell, J.A.; Kukes, S.G.

    1986-08-26

    A process is described for hydrovisbreaking a hydrocarbon-containing feed stream comprising the steps of: introducing a decomposable molybdenum additive selected from the group consisting of a mixture of molybdenum dithiophosphate and a molybdenum carboxylate and a mixture of a molybdenum dithiocarbamate and a molybdenum carboxylate into the hydrocarbon-containing feed stream; and contacting the hydrocarbon-containing feed stream containing the decomposable molybdenum additive under hydrovisbreaking conditions with hydrogen, wherein the contacting is carried out in the absence of a solid support for the decomposable molybdenum additive.

  10. Herbicides in streams. Midwestern United States

    USGS Publications Warehouse

    Goolsby, Donald A.; Thurman, E. Michael; Kolpin, Dana W.

    1991-01-01

    Results from a 2-year study of 149 streams geographically distributed across the corn-producing region of 10 midwestern States show that detectable concentrations of herbicides persist year round in most streams. Some herbicides exceeded proposed maximum contaminant levels for drinking water for periods of several weeks to several months following application. Atrazine was the most frequently detected and most persistent herbicide measured, followed by desethylatrazine and metolachlor. The seasonal distribution of atrazine indicates that aquifers contributing base flow to many of the streams are contaminated with herbicides.

  11. RADIOACTIVE WASTE STREAMS FROM VARIOUS POTENTIAL NUCLEAR FUEL CYCLE OPTIONS

    SciTech Connect

    Nick Soelberg; Steve Piet

    2010-11-01

    Five fuel cycle options, about which little is known compared to more commonly known options, have been studied in the past year for the United States Department of Energy. These fuel cycle options, and their features relative to uranium-fueled light water reactor (LWR)-based fuel cycles, include: Advanced once-through reactor concepts (Advanced Once-Through, or AOT) intended for high uranium utilization and long reactor operating life, use depleted uranium in some cases, and avoid or minimize used fuel reprocessing Fission-fusion hybrid (FFH) reactor concepts potential variations are intended for high uranium or thorium utilization, produce fissile material for use in power generating reactors, or transmute transuranic (TRU) and some radioactive fission product (FP) isotopes High temperature gas reactor (HTGR) concepts - intended for high uranium utilization, high reactor thermal efficiencies; they have unique fuel designs Molten salt reactor (MSR) concepts can breed fissile U-233 from Th fuel and avoid or minimize U fuel enrichment, use on-line reprocessing of the used fuel, produce lesser amounts of long-lived, highly radiotoxic TRU elements, and avoid fuel assembly fabrication Thorium/U-233 fueled LWR (Th/U-233) concepts can breed fissile U-233 from Th fuel and avoid or minimize U fuel enrichment, and produce lesser amounts of long-lived, highly radiotoxic TRU elements. These fuel cycle options could result in widely different types and amounts of used or spent fuels, spent reactor core materials, and waste streams from used fuel reprocessing, such as: Highly radioactive, high-burnup used metal, oxide, or inert matrix U and/or Th fuels, clad in Zr, steel, or composite non-metal cladding or coatings Spent radioactive-contaminated graphite, SiC, carbon-carbon-composite, metal, and Be reactor core materials Li-Be-F salts containing U, TRU, Th, and fission products Ranges of separated or un-separated activation products, fission products, and actinides. Waste forms now used or studied for used LWR fuels can be used for some of these waste streams but some waste forms may need to be developed for unique waste streams.

  12. A Stellar Stream Surrounds the Whale Galaxy

    NASA Astrophysics Data System (ADS)

    Kohler, Susanna

    2015-10-01

    The -cold dark matter cosmological model predicts that galaxies are assembled through the disruption and absorption of small satellite dwarf galaxies by their larger hosts. A recent study argues that NGC 4631, otherwise known as the Whale galaxy, shows evidence of such a recent merger in the form of an enormous stellar stream extending from it.Stream SignaturesAccording to the -CDM model, stellar tidal streams should be a ubiquitous feature among galaxies. When satellite dwarf galaxies are torn apart, they spread out into such streams before ultimately feeding the host galaxy. Unfortunately, these streams are very faint, so were only recently starting to detect these features.Stellar tidal streams have been discovered around the Milky Way and Andromeda, providing evidence of these galaxies growth via recent (within the last 8 Gyr) mergers. But discovering stellar streams around other Milky Way-like galaxies would help us to determine if the model of hierarchical galaxy assembly applies generally.To this end, the Stellar Tidal Stream Survey, led by PI David Martnez-Delgado (Center for Astronomy of Heidelberg University), is carrying out the first systematic survey of stellar tidal streams. In a recent study, Martnez-Delgado and collaborators present their detection of a giant (85 kpc long!) stellar tidal stream extending into the halo of NGC 4631, the Whale galaxy.Modeling a SatelliteThe top image is a snapshot from an N-body simulation of a single dwarf satellite, 3.5 Gyr after it started interacting with the Whale galaxy. The satellite has been torn apart and spread into a stream that reproduces observations, which are shown in the lower image (scale is not the same). [Martnez-Delgado et al. 2015]The Whale galaxy is a nearby edge-on spiral galaxy interacting with a second spiral, NGC 4656. But the authors dont believe that the Whale galaxys giant tidal stellar stream is caused by its interactions with NGC 4656. Instead, based on their observations, they believe that a dwarf satellite galaxy was disrupted to make that stream.To support their observations, the authors modeled the system using an N-body simulation. They were able to reproduce the appearance of the stream by sending a single, massive dwarf satellite onto a moderately eccentric orbit around the Whale galaxy. The team showed that, over the span of about 3.5 Gyr, the satellite became disrupted and spread into a structure very similar to the stellar tidal stream we now observe. In this simulation, the last remains of the dwarf satellite are contained within the northwest arm of the stream.The authors point out that the Whale galaxy has additional gaseous tidal features that likely originated from a more recent, gas-rich accretion event. There are also two bright regions that may be more dwarf satellites around the galaxy (labeled DW1 and DW2 in the header image). If the authors interpretation of the observed stellar stream is correct, then the Whale galaxy shows evidence for multiple recent mergers. This would support the idea that hierarchical formation models apply to other galaxies similar to the Milky Way.CitationDavid Martnez-Delgado et al 2015 AJ 150 116. doi:10.1088/0004-6256/150/4/116

  13. A Stellar Stream Surrounds the Whale Galaxy

    NASA Astrophysics Data System (ADS)

    Kohler, Susanna

    2016-01-01

    The -cold dark matter cosmological model predicts that galaxies are assembled through the disruption and absorption of small satellite dwarf galaxies by their larger hosts. A recent study argues that NGC 4631, otherwise known as the Whale galaxy, shows evidence of such a recent merger in the form of an enormous stellar stream extending from it.Stream SignaturesAccording to the -CDM model, stellar tidal streams should be a ubiquitous feature among galaxies. When satellite dwarf galaxies are torn apart, they spread out into such streams before ultimately feeding the host galaxy. Unfortunately, these streams are very faint, so were only recently starting to detect these features.Stellar tidal streams have been discovered around the Milky Way and Andromeda, providing evidence of these galaxies growth via recent (within the last 8 Gyr) mergers. But discovering stellar streams around other Milky Way-like galaxies would help us to determine if the model of hierarchical galaxy assembly applies generally.To this end, the Stellar Tidal Stream Survey, led by PI David Martnez-Delgado (Center for Astronomy of Heidelberg University), is carrying out the first systematic survey of stellar tidal streams. In a recent study, Martnez-Delgado and collaborators present their detection of a giant (85 kpc long!) stellar tidal stream extending into the halo of NGC 4631, the Whale galaxy.Modeling a SatelliteThe top image is a snapshot from an N-body simulation of a single dwarf satellite, 3.5 Gyr after it started interacting with the Whale galaxy. The satellite has been torn apart and spread into a stream that reproduces observations, which are shown in the lower image (scale is not the same). [Martnez-Delgado et al. 2015]The Whale galaxy is a nearby edge-on spiral galaxy interacting with a second spiral, NGC 4656. But the authors dont believe that the Whale galaxys giant tidal stellar stream is caused by its interactions with NGC 4656. Instead, based on their observations, they believe that a dwarf satellite galaxy was disrupted to make that stream.To support their observations, the authors modeled the system using an N-body simulation. They were able to reproduce the appearance of the stream by sending a single, massive dwarf satellite onto a moderately eccentric orbit around the Whale galaxy. The team showed that, over the span of about 3.5 Gyr, the satellite became disrupted and spread into a structure very similar to the stellar tidal stream we now observe. In this simulation, the last remains of the dwarf satellite are contained within the northwest arm of the stream.The authors point out that the Whale galaxy has additional gaseous tidal features that likely originated from a more recent, gas-rich accretion event. There are also two bright regions that may be more dwarf satellites around the galaxy (labeled DW1 and DW2 in the header image). If the authors interpretation of the observed stellar stream is correct, then the Whale galaxy shows evidence for multiple recent mergers. This would support the idea that hierarchical formation models apply to other galaxies similar to the Milky Way.CitationDavid Martnez-Delgado et al 2015 AJ 150 116. doi:10.1088/0004-6256/150/4/116

  14. Community Living Skills: Nutrition I.

    ERIC Educational Resources Information Center

    Kreps, Alice Roelofs; Dreith, Rita Vallero

    One of twenty course guides in the Community Living Skills Guide for the College for Living series, this document provides guidelines and workbook activities for the course, Nutrition I. The series of courses for developmentally disabled adults is intended to supplement residential programs and to aid in orienting institutionalized persons to

  15. Learning Lives and Alumni Voices

    ERIC Educational Resources Information Center

    Jacobs, Andrea; Leach, Camilla; Spencer, Stephanie

    2010-01-01

    Changes in governmental financial support are causing many would-be students to question the value of higher education or to consider attending a local university. Oral history testimonies provide a source for understanding the role that living, as well as working, within an academic community plays in the learning lives of its alumni. An

  16. Engineering Knowledge for Assistive Living

    NASA Astrophysics Data System (ADS)

    Chen, Liming; Nugent, Chris

    This paper introduces a knowledge based approach to assistive living in smart homes. It proposes a system architecture that makes use of knowledge in the lifecycle of assistive living. The paper describes ontology based knowledge engineering practices and discusses mechanisms for exploiting knowledge for activity recognition and assistance. It presents system implementation and experiments, and discusses initial results.

  17. Influences of wildfire and channel reorganization on spatial and temporal variation in stream temperature and the distribution of fish and amphibians

    USGS Publications Warehouse

    Dunham, J.B.; Rosenberger, A.E.; Luce, C.H.; Rieman, B.E.

    2007-01-01

    Wildfire can influence a variety of stream ecosystem properties. We studied stream temperatures in relation to wildfire in small streams in the Boise River Basin, located in central Idaho, USA. To examine the spatio-temporal aspects of temperature in relation to wildfire, we employed three approaches: a pre-post fire comparison of temperatures between two sites (one from a burned stream and one unburned) over 13 years, a short-term (3 year) pre-post fire comparison of a burned and unburned stream with spatially extensive data, and a short-term (1 year) comparative study of spatial variability in temperatures using a "space for time" substitutive design across 90 sites in nine streams (retrospective comparative study). The latter design included streams with a history of stand-replacing wildfire and streams with severe post-fire reorganization of channels due to debris flows and flooding. Results from these three studies indicated that summer maximum water temperatures can remain significantly elevated for at least a decade following wildfire, particularly in streams with severe channel reorganization. In the retrospective comparative study we investigated occurrence of native rainbow trout (Oncorhynchus mykiss) and tailed frog larvae (Ascaphus montanus) in relation to maximum stream temperatures during summer. Both occurred in nearly every site sampled, but tailed frog larvae were found in much warmer water than previously reported in the field (26.6??C maximum summer temperature). Our results show that physical stream habitats can remain altered (for example, increased temperature) for many years following wildfire, but that native aquatic vertebrates can be resilient. In a management context, this suggests wildfire may be less of a threat to native species than human influences that alter the capacity of stream-living vertebrates to persist in the face of natural disturbance. ?? 2007 Springer Science+Business Media, LLC.

  18. Web-Streamed Didactic Instruction on Substance Use Disorders Compares Favorably with Live-Lecture Format

    ERIC Educational Resources Information Center

    Maher, Karam-Hage; Brower, Kirk J.; Mullan, Patricia B.; Gay, Tamara; Gruppen, Larry D.

    2013-01-01

    Objective: Education about substance use disorders in medical schools and, subsequently, physicians' identification of and intervention in these diagnoses lag behind that of most other disabling disorders. To reduce barriers and improve access to education about this major public health concern, medical schools are increasingly adopting web-based

  19. Efficient Analysis of Live and Historical Streaming Data and its Application to Cybersecurity

    E-print Network

    Reiss, Frederick; Stockinger, Kurt; Wu, Kesheng; Shoshani, Arie; Hellerstein, Joseph M.

    2007-01-01

    desc Dispersion Goal: Find subnets at a IP pre?x length thatip order by fanout desc limit 100 per window; FastBit Query: Findsip order by sum(bytes sent) desc limit 100 per window; Portscans Goal: Find

  20. A portable identification guide to invertebrates living in freshwater streams, lakes, creeks and ponds

    E-print Network

    Thorp, James H.

    , Class Turbellaria Chapter 08 Hairworms: Phylum Nematomorpha Chapter 09 Snails: Phylum Mollusca, Class Gastropoda Chapter 10 Mussels and Clams: Phylum Mollusca, Class Bivalvia Chapter 11 Aquatic Segmented Worms

  1. Live-streaming: Time-lapse video evidence of novel streamer formation mechanism and varying viscosity.

    PubMed

    Parvinzadeh Gashti, Mazeyar; Bellavance, Julien; Kroukamp, Otini; Wolfaardt, Gideon; Taghavi, Seyed Mohammad; Greener, Jesse

    2015-07-01

    Time-lapse videos of growing biofilms were analyzed using a background subtraction method, which removed camouflaging effects from the heterogeneous field of view to reveal evidence of streamer formation from optically dense biofilm segments. In addition, quantitative measurements of biofilm velocity and optical density, combined with mathematical modeling, demonstrated that streamer formation occurred from mature, high-viscosity biofilms. We propose a streamer formation mechanism by sudden partial detachment, as opposed to continuous elongation as observed in other microfluidic studies. Additionally, streamer formation occurred in straight microchannels, as opposed to serpentine or pseudo-porous channels, as previously reported. PMID:26339304

  2. New medium, new practice : civic production in live-streaming mobile video

    E-print Network

    Dougherty, Audubon McKeown

    2010-01-01

    The ubiquity of camera phones, coupled with the increasing mobility of citizens and the rise of digital production as an embedded technosocial practice, is creating incentives for many people around the globe to engage in ...

  3. OPTIMAL SERVER BANDWIDTH ALLOCATION AMONG MULTIPLE P2P MULTICAST LIVE VIDEO STREAMING SESSIONS

    E-print Network

    Girod, Bernd

    to support more direct chil- dren, however, supporting more direct children reduces the impact of peer the optimal number of direct chil- dren for each tree. Although we focus on minimizing the to- tal distortion

  4. The living publication

    SciTech Connect

    Terwilliger, Thomas C.

    2012-06-04

    Within the ICSTI Insights Series we offer three articles on the 'living publication' that is already available to practitioners in the important field of crystal structure determination and analysis. While the specific examples are drawn from this particular field, we invite readers to draw parallels in their own fields of interest. The first article describes the present state of the crystallographic living publication, already recognized by an ALPSP (Association of Learned and Professional Society Publishers) Award for Publishing Innovation in 2006. The second article describes the potential impact on the record of science as greater post-publication analysis becomes more common within currently accepted data deposition practices, using processed diffraction data as the starting point. The third article outlines a vision for the further improvement of crystallographic structure reports within potentially achievable enhanced data deposition practices, based upon raw (unprocessed) diffraction data. The IUCr in its Commissions and Journals has for many years emphasized the importance of publications being accompanied by data and the interpretation of the data in terms of atomic models. This has been followed as policy by numerous other journals in the field and its cognate disciplines. This practice has been well served by databases and archiving institutions such as the Protein Data Bank (PDB), the Cambridge Crystallographic Data Centre (CCDC), and the Inorganic Crystal Structure Database (ICSD). Normally the models that are archived are interpretations of the data, consisting of atomic coordinates with their displacement parameters, along with processed diffraction data from X-ray, neutron or electron diffraction studies. In our current online age, a reader can not only consult the printed word, but can display and explore the results with molecular graphics software of exceptional quality. Furthermore, the routine availability of processed diffraction data allows readers to perform direct calculations of the electron density (using X-rays and electrons as probes) or the nuclear density (using neutrons as probe) on which the molecular models are directly based. This current community practice is described in our first article. There are various ways that these data and tools can be used to further analyze the molecules that have been crystallized. Notably, once a set of results is announced via the publication, the research community can start to interact directly with the data and models. This gives the community the opportunity not only to read about the structure, but to examine it in detail, and even generate subsequent improved models. These improved models could, in principle, be archived along with the original interpretation of the data and can represent a continuously improving set of interpretations of a set of diffraction data. The models could improve both by correction of errors in the original interpretation and by the use of new representations of molecules in crystal structures that more accurately represent the contents of a crystal. These possible developments are described in our second article. A current, significant, thrust for the IUCr is whether it would be advantageous for the crystallographic community to require, rather than only encourage, the archiving of the raw (unprocessed) diffraction data images measured from a crystal, a fibre or a solution. This issue is being evaluated in detail by an IUCr Working Group (see http://forums.iucr.org). Such archived raw data would be linked to and from any associated publications. The archiving of raw diffraction data could allow as yet undeveloped processing methods to have access to the originally measured data. The debate within the community about this much larger proposed archiving effort revolves around the issue of 'cost versus benefit'. Costs can be minimized by preserving the raw data in local repositories, either at centralized synchrotron and neutron research institutes, or at research universities. Archiving raw data is also perceived as bein

  5. Riparian and in-stream controls on nutrient concentrations and fluxes in a headwater forested stream

    NASA Astrophysics Data System (ADS)

    Bernal, S.; Lupon, A.; Ribot, M.; Sabater, F.; Mart, E.

    2015-03-01

    Headwater streams are recipients of water sources draining through terrestrial ecosystems. At the same time, stream biota can transform and retain nutrients dissolved in stream water. Yet studies considering simultaneously these two sources of variation in stream nutrient chemistry are rare. To fill this gap of knowledge, we analyzed stream water and riparian groundwater concentrations and fluxes as well as in-stream net uptake rates for nitrate (NO3-), ammonium (NH4+), and soluble reactive phosphorus (SRP) along a 3.7 km reach on an annual basis. Chloride concentrations (used as conservative tracer) indicated a strong hydrological connection at the riparian-stream interface. However, stream and riparian groundwater nutrient concentrations showed a moderate to null correlation, suggesting high in-stream biogeochemical processing. In-stream net nutrient uptake (Fsw) was highly variable across contiguous segments and over time, but its temporal variation was not related to the vegetative period of the riparian forest. For NH4+, the occurrence of Fsw > 0 ?g N m-1 s-1 (gross uptake > release) was high along the reach, while for NO3-, the occurrence of Fsw < 0 ?g N m-1 s-1 (gross uptake < release) increased along the reach. Within segments and dates, Fsw, whether negative or positive, accounted for a median of 6, 18, and 20% of the inputs of NO3-, NH4+, and SRP, respectively. Whole-reach mass balance calculations indicated that in-stream net uptake reduced stream NH4+ flux up to 90%, while the stream acted mostly as a source of NO3- and SRP. During the dormant period, concentrations decreased along the reach for NO3-, but increased for NH4+ and SRP. During the vegetative period, NH4+ decreased, SRP increased, and NO3- showed a U-shaped pattern along the reach. These longitudinal trends resulted from the combination of hydrological mixing with terrestrial inputs and in-stream nutrient processing. Therefore, the assessment of these two sources of variation in stream water chemistry is crucial to understand the contribution of in-stream processes to stream nutrient dynamics at relevant ecological scales.

  6. Recovery of three arctic stream reaches from experimental nutrient enrichment

    USGS Publications Warehouse

    Benstead, J.P.; Green, A.C.; Deegan, Linda A.; Peterson, B.J.; Slavik, K.; Bowden, W.B.; Hershey, A.E.

    2007-01-01

    1. Nutrient enrichment and resulting eutrophication is a widespread anthropogenic influence on freshwater ecosystems, but recovery from nutrient enrichment is poorly understood, especially in stream environments. We examined multi-year patterns in community recovery from experimental low-concentration nutrient enrichment (N + P or P only) in three reaches of two Arctic tundra streams (Kuparuk River and Oksrukuyik Creek) on the North Slope of Alaska (U.S.A.). 2. Rates of recovery varied among community components and depended on duration of enrichment (2-13 consecutive growing seasons). Biomass of epilithic algae returned to reference levels rapidly (within 2 years), regardless of nutrients added or enrichment duration. Aquatic bryophyte cover, which increased greatly in the Kuparuk River only after long-term enrichment (8 years), took 8 years of recovery to approach reference levels, after storms had scoured most remnant moss in the recovering reach. 3. Multi-year persistence of bryophytes in the Kuparuk River appeared to prevent recovery of insect populations that had either been positively (e.g. the mayfly Ephemerella, most chironomid midge taxa) or negatively (e.g. the tube-building chironomid Orthocladius rivulorum) affected by this shift in dominant primary producer. These lags in recovery (of >3 years) were probably driven by the persistent effect of bryophytes on physical benthic habitat. 4. Summer growth rates of Arctic grayling (both adults and young-of-year) in Oksrukuyik Creek (fertilised for 6 years with no bryophyte colonisation), which were consistently increased by nutrient addition, returned to reference rates within 1-2 years. 5. Rates of recovery of these virtually pristine Arctic stream ecosystems from low-level nutrient enrichment appeared to be controlled largely by duration of enrichment, mediated through physical habitat shifts caused by eventual bryophyte colonisation, and subsequent physical disturbance that removed bryophytes. Nutrient enrichment of oligotrophic Arctic stream ecosystems caused by climate change or local anthropogenic activity may have dramatic and persistent consequences if it results in the colonisation of long-lived primary producers that alter physical habitat. ?? 2007 The Authors.

  7. Stream-Network navigation in the U.S. geological survey streamStats web application

    USGS Publications Warehouse

    Ries, K.G.; Steeves, P.A.; Guthrie, J.D.; Rea, A.H.; Stewart, D.W.

    2009-01-01

    StreamStats is a U.S. Geological Survey Webbased geographic information systems application developed as a tool for water-resources planning and management, engineering design, and other applications. The primary functionality of StreamStats allows users to obtain drainage-basin boundaries, basin characteristics, and streamflow statistics for gaged and ungaged sites. Recently, tools that allow stream-network navigation were added to StreamStats. These tools allow users to select any point along a stream and locate activities upstream and downstream from the selected point, such as streamgaging stations, dams, and point-source discharges, and obtain information about such activities. Users also can obtain stream-reach addresses and estimates of streamflow statistics for the selected points.

  8. Stream-network navigation in the U.S. Geological Survey StreamStats Web Application

    USGS Publications Warehouse

    Ries, Kernell G., III; Steeves, Peter A.; Guthrie, John D.; Rea, Alan H.; Stewart, David W.

    2009-01-01

    StreamStats is a U.S. Geological Survey Webbased geographic information systems application developed as a tool for water-resources planning and management, engineering design, and other applications. The primary functionality of StreamStats allows users to obtain drainage-basin boundaries, basin characteristics, and streamflow statistics for gaged and ungaged sites. Recently, tools that allow stream-network navigation were added to StreamStats. These tools allow users to select any point along a stream and locate activities upstream and downstream from the selected point, such as streamgaging stations, dams, and point-source discharges, and obtain information about such activities. Users also can obtain stream-reach addresses and estimates of streamflow statistics for the selected points.

  9. Low-flow characteristics of Alabama streams

    USGS Publications Warehouse

    Bingham, Roy H.

    1982-01-01

    A new procedure for estimating the 7-day, 2-year and the 7-day, 10-year low flow of ungaged Alabama streams is based on geology, drainage area, and mean annual precipitation. One equation for each of the two low-flow frequencies applies statewide to all natural flow streams; the equations do not apply to streams where flow is significantly altered by activities of man. The standard error of estimate of each equation based on map values is 40 percent for 7-day, 2-year low flow and 44 percent for 7-day, 10-year low flow. The rate of streamflow recession is used to account for the effects of geology on low flow. Streamflow recession rate depends primarily on transmissivity and storage characteristics of the aquifers, and average distance from stream channels to divides. Relations of low-flow discharge to geology, drainage area, and mean annual precipitation were analyzed by multiple regression techniques.

  10. Salt vulnerability assessment methodology for urban streams

    NASA Astrophysics Data System (ADS)

    Betts, A. R.; Gharabaghi, B.; McBean, E. A.

    2014-09-01

    De-icing agents such as road salts while used for winter road maintenance can cause negative effects on urban stream water quality and drinking water supplies. A new methodology using readily available spatial data to identify Salt Vulnerable Areas (SVAs) for urban streams is used to prioritize implementation of best management practices. The methodology calculates the probable chloride concentration statistics at specified points in the urban stream network and compares the results with known aquatic species exposure tolerance limits to characterize the vulnerability scores. The approach prioritizes implementation of best management practices to areas identified as vulnerable to road salt. The vulnerability assessment is performed on seven sites in four watersheds in the Greater Toronto Area and validated using the Hanlon Creek watershed in Guelph. The mean annual in-stream chloride concentration equation uses readily available spatial data - with province-wide coverage - that can be easily used in any urban watershed.

  11. Reactive solute transport in acidic streams

    USGS Publications Warehouse

    Broshears, R.E.

    1996-01-01

    Spatial and temporal profiles of Ph and concentrations of toxic metals in streams affected by acid mine drainage are the result of the interplay of physical and biogeochemical processes. This paper describes a reactive solute transport model that provides a physically and thermodynamically quantitative interpretation of these profiles. The model combines a transport module that includes advection-dispersion and transient storage with a geochemical speciation module based on MINTEQA2. Input to the model includes stream hydrologic properties derived from tracer-dilution experiments, headwater and lateral inflow concentrations analyzed in field samples, and a thermodynamic database. Simulations reproduced the general features of steady-state patterns of observed pH and concentrations of aluminum and sulfate in St. Kevin Gulch, an acid mine drainage stream near Leadville, Colorado. These patterns were altered temporarily by injection of sodium carbonate into the stream. A transient simulation reproduced the observed effects of the base injection.

  12. Improving the Software Upgrade Value Stream

    E-print Network

    Ippolito, Brian

    This paper reports findings from a two-year study to identify Lean practices for deriving software requirements from aerospace system level requirements, with a goal towards improving the software upgrade value stream.

  13. Flood-frequency characteristics of Wisconsin streams

    USGS Publications Warehouse

    Walker, John F.; Krug, William R.

    2003-01-01

    Flood-frequency characteristics for 312 gaged sites on Wisconsin streams are presented for recurrence intervals of 2 to 100 years using flood-peak data collected through water year 2000. Equations of the relations between flood-frequency and drainage-basin characteristics were developed by multiple-regression analyses. Flood-frequency characteristics for ungaged sites on unregulated, rural streams can be estimated by use of these equations. The state was divided into five areas with similar physiographic characteristics. The most significant basin characteristics are drainage area, main-channel slope, soil permeability, storage, rainfall intensity, and forest cover. The standard error of prediction for the equation for the 100-year flood discharge ranges from 22 to 44 percent in the state. A graphical method for estimating flood-frequency characteristics of regulated streams was developed from the relation of discharge and drainage area. Graphs for the major regulated streams are presented.

  14. Dorsal stream : from algorithm to neuroscience

    E-print Network

    Jhuang, Hueihan

    2011-01-01

    The dorsal stream in the primate visual cortex is involved in the perception of motion and the recognition of actions. The two topics, motion processing in the brain, and action recognition in videos, have been developed ...

  15. One Video Stream to Serve Diverse Receivers

    E-print Network

    Woo, Grace

    2008-10-18

    The fundamental problem of wireless video multicast is to scalably serve multiple receivers which may have very different channel characteristics. Ideally, one would like to broadcast a single stream that allows each ...

  16. The SPRAWL distributed stream dissemination system

    E-print Network

    Mei, Yuan, Ph. D. Massachusetts Institute of Technology

    2015-01-01

    Many large financial, news, and social media companies process and stream large quantities of data to customers, either through the public Internet or on their own internal networks. These customers often depend on that ...

  17. A dynamically reconfigurable data stream processing system

    SciTech Connect

    Nogiec, J.M.; Trombly-Freytag, K.; /Fermilab

    2004-11-01

    This paper describes a component-based framework for data stream processing that allows for configuration, tailoring, and runtime system reconfiguration. The system's architecture is based on a pipes and filters pattern, where data is passed through routes between components. A network of pipes and filters can be dynamically reconfigured in response to a preplanned sequence of processing steps, operator intervention, or a change in one or more data streams. This framework provides several mechanisms supporting dynamic reconfiguration and can be used to build static data stream processing applications such as monitoring or data acquisition systems, as well as self-adjusting systems that can adapt their processing algorithm, presentation layer, or data persistency layer in response to changes in input data streams.

  18. Water Stream "Loop-the-Loop"

    ERIC Educational Resources Information Center

    Jefimenko, Oleg

    1974-01-01

    Discusses the design of a modified loop-the-loop apparatus in which a water stream is used to illustrate centripetal forces and phenomena of high-velocity hydrodynamics. Included are some procedures of carrying out lecture demonstrations. (CC)

  19. The invariance hypothesis and the ventral stream

    E-print Network

    Leibo, Joel Zaidspiner

    2014-01-01

    The invariance hypothesis is the claim that properties of the ventral stream can be deduced from 1. a consideration of the computational problem with which it is engaged: invariant object recognition, 2. constraints of the ...

  20. Noise Prediction Module for Offset Stream Nozzles

    NASA Technical Reports Server (NTRS)

    Henderson, Brenda S.

    2011-01-01

    A Modern Design of Experiments (MDOE) analysis of data acquired for an offset stream technology was presented. The data acquisition and concept development were funded under a Supersonics NRA NNX07AC62A awarded to Dimitri Papamoschou at University of California, Irvine. The technology involved the introduction of airfoils in the fan stream of a bypass ratio (BPR) two nozzle system operated at transonic exhaust speeds. The vanes deflected the fan stream relative to the core stream and resulted in reduced sideline noise for polar angles in the peak jet noise direction. Noise prediction models were developed for a range of vane configurations. The models interface with an existing ANOPP module and can be used or future system level studies.

  1. Stream ecology in an Alaskan tundra watershed

    SciTech Connect

    Oswood, M.W.

    1991-03-01

    This study was part of the R4D Project'', a large, multi- investigator study of an arctic watershed on the Alaskan North Slope. The ultimate goal of this program was to examine the response, resistance, and resilience to, and recovery from disturbances in arctic tundra ecosystems (hence, R4D). This report concerns the Steam Ecology portion of the R4D, project under the direction of Dr. Mark Oswood. Consideration of arctic streams is critical to rational management of the arctic landscape. Since streams drain upslope areas, disturbances visited upon valley slopes often have unwelcome consequences to the stream at the bottom of the valley. Degradation of water quality is generally not limited to a localized stretch of stream but transported some distance downstream and may involve changes in water quality or fish and wildlife populations in downstream rivers lakes, or estuaries. 14 refs.

  2. Optimizations in stream programming for multimedia applications

    E-print Network

    Wong, Eric, M. Eng. Massachusetts Institute of Technology

    2012-01-01

    Multimedia applications are the most dominant workload in desktop and mobile computing. Such applications regularly process continuous sequences of data and can be naturally represented under the stream programming domain ...

  3. Web Audio/Video Streaming Tool

    NASA Technical Reports Server (NTRS)

    Guruvadoo, Eranna K.

    2003-01-01

    In order to promote NASA-wide educational outreach program to educate and inform the public of space exploration, NASA, at Kennedy Space Center, is seeking efficient ways to add more contents to the web by streaming audio/video files. This project proposes a high level overview of a framework for the creation, management, and scheduling of audio/video assets over the web. To support short-term goals, the prototype of a web-based tool is designed and demonstrated to automate the process of streaming audio/video files. The tool provides web-enabled users interfaces to manage video assets, create publishable schedules of video assets for streaming, and schedule the streaming events. These operations are performed on user-defined and system-derived metadata of audio/video assets stored in a relational database while the assets reside on separate repository. The prototype tool is designed using ColdFusion 5.0.

  4. A kinetic cross-field streaming instability

    NASA Technical Reports Server (NTRS)

    Wu, C. S.; Winske, D.; Papadopoulos, K.; Zhou, Y. M.; Tsai, S. T.; Guo, S. C.

    1983-01-01

    In a high-beta plasma the so-called modified-two-stream instability, which results from strongly magnetized electrons drifting relative to unmagnetized ions across a homogeneous magnetic field, is misnamed because the mode is highly kinetic, particularly when the relative streaming velocity exceeds the Alfven speed of the plasma. This kinetic cross-field streaming instability is investigated in detail, examining the effect of the electromagnetic terms and the stability boundaries in both low- and high-beta plasmas. An approximate dispersion relation showing the relation of this mode to the whistler is derived and solutions of it are compared with those obtained from the exact dispersion relation. The kinetic mode, unlike the usual modified-two-stream instability, is not stabilized by electromagnetic effects when the relative electron-ion drift speed exceeds the Alfven speed.

  5. Data Streams: An Overview and Scientific Applications

    NASA Astrophysics Data System (ADS)

    Aggarwal, Charu C.

    In recent years, advances in hardware technology have facilitated the ability to collect data continuously. Simple transactions of everyday life such as using a credit card, a phone, or browsing the web lead to automated data storage. Similarly, advances in information technology have lead to large flows of data across IP networks. In many cases, these large volumes of data can be mined for interesting and relevant information in a wide variety of applications. When the volume of the underlying data is very large, it leads to a number of computational and mining challenges: With increasing volume of the data, it is no longer possible to process the data efficiently by using multiple passes. Rather, one can process a data item at most once. This leads to constraints on the implementation of the underlying algorithms. Therefore, stream mining algorithms typically need to be designed so that the algorithms work with one pass of the data. In most cases, there is an inherent temporal component to the stream mining process. This is because the data may evolve over time. This behavior of data streams is referred to as temporal locality. Therefore, a straightforward adaptation of one-pass mining algorithms may not be an effective solution to the task. Stream mining algorithms need to be carefully designed with a clear focus on the evolution of the underlying data. Another important characteristic of data streams is that they are often mined in a distributed fashion. Furthermore, the individual processors may have limited processing and memory. Examples of such cases include sensor networks, in which it may be desirable to perform in-network processing of data stream with limited processing and memory [1, 2]. This chapter will provide an overview of the key challenges in stream mining algorithms which arise from the unique setup in which these problems are encountered. This chapter is organized as follows. In the next section, we will discuss the generic challenges that stream mining poses to a variety of data management and data mining problems. The next section also deals with several issues which arise in the context of data stream management. In Sect. 3, we discuss several mining algorithms on the data stream model. Section 4 discusses various scientific applications of data streams. Section 5 discusses the research directions and conclusions.

  6. Polymictic pool behavior in Sierra Nevada Streams

    NASA Astrophysics Data System (ADS)

    Lucas, R. G.; Conklin, M. H.; Tyler, S. W.; Suarez, F. I.; Moran, J. E.; Esser, B. K.

    2010-12-01

    Pools in streams and meadows in the mid to high Sierra Nevada (1800-2300 m) in low flow scenarios were observed to exhibit polymictic behavior during summer months. Although daily thermal stratification has been observed in pools of various sizes and in multiple locations, the degree and timing of stratification is highly variable and not well understood. Previous studies have shown that thermally stratified stream pools can provide cold water refugia for thermally sensitive species, specifically salmonid fish. Diel temperature patterns demonstrating daily thermal stratification and nightly mixing of small (1-4 m diameter and 1-2 m deep) pools in the Long Meadow complex (Sequoia National Park, CA) were observed during the deployment of a distributed temperature sensor (DTS) in 2008. Similar behavior was also noted in stream pools along Chilnualna Creek, a tributary of the South Fork of the Merced River, Yosemite National Park, CA. To further investigate this polymictic behavior, we developed a two-dimensional model of water temperature and flow using Fluent, a computational fluid dynamics solver. The model successfully simulated thermal patterns similar to those observed and indicated that groundwater inflow has a significant influence on pool stratification, consistent with observed low temperatures and raised Radon-222 activity in highly localized areas in the pool bottoms. Similar polymictic behavior was observed in larger (4-10 m diameter and 1.5-2 m deep) stream pools on Chilnualna Creek in the late summer under baseflow conditions. The significant factors that determine stratification or mixing conditions are stream flow velocity, groundwater influence, and density variations due to radiative heating. We use the Richardson number, which was originally developed for assessing thermal stratification in lakes and reservoirs, to develop a one-dimensional tool for prediction of stream pool stratification at multiple scales. This application allows us to assess the stream velocity versus the density discrepancy dictated by the thermal gradient of a given stream pool. Using approximations of stream velocity, stream and groundwater temperatures, we can predict the potential for a stream pool to provide a refuge of cold water.

  7. Wireless image streaming in mobile ultrasound.

    PubMed

    Dickson, Brett W; Pedersen, Peder C

    2010-03-01

    This work evaluates the feasibility of using 802.11 g ad hoc and 3G cellular broadband networks to wirelessly stream ultrasound video in real-time. Telemedicine ultrasound applications in events such as disaster relief and first-response triage can incorporate these technologies, enabling onsite medical personnel to receive assistance with diagnostic decisions by remote medical experts. The H.264 scalable video codec was used to encode echocardiographic video streams at various image resolutions (video graphics array [VGA] and quarter video graphics array [QVGA]) and frame rates (10, 15, 20, and 30 frames/s). The video stream was transmitted using 802.11 g and 3G cellular technologies, and pertinent transmission parameters such as data rate, packet loss, delay jitter, and latency were measured. 802.11 g permits high frame rate and VGA resolution and has low latency and jitter, but it is suitable only for short communication ranges, whereas the 3G cellular network allows medium to low frame rate streaming at QVGA image resolution with medium latency. However, video streaming can take place from any location with 3G service to any other site with Internet connectivity. The transmitted ultrasound video streams were subsequently recorded and evaluated by physicians with expertise in medical ultrasonography who evaluated the diagnostic value of the received video streams relative to the original videos. They expressed the opinion that image quality in the case of both 802.11 g and 3G was fully to adequately preserved, but missed frames could momentarily decrease the diagnostic value. This research demonstrates that 3G and 802.11 g wireless networks combined with efficient video compression make diagnostically valuable wireless streaming of ultrasound video feasible. PMID:20136557

  8. Side Stream Filtration for Cooling Towers

    SciTech Connect

    2012-10-20

    This technology evaluation assesses side stream filtration options for cooling towers, with an objective to assess key attributes that optimize energy and water savings along with providing information on specific technology and implementation options. This information can be used to assist Federal sites to determine which options may be most appropriate for their applications. This evaluation provides an overview of the characterization of side stream filtration technology, describes typical applications, and details specific types of filtration technology.

  9. Mining for Surprise Events within Text Streams

    SciTech Connect

    Whitney, Paul D.; Engel, David W.; Cramer, Nicholas O.

    2009-04-30

    This paper summarizes algorithms and analysis methodology for mining the evolving content in text streams. Text streams include news, press releases from organizations, speeches, Internet blogs, etc. These data are a fundamental source for detecting and characterizing strategic intent of individuals and organizations as well as for detecting abrupt or surprising events within communities. Specifically, an analyst may need to know if and when the topic within a text stream changes. Much of the current text feature methodology is focused on understanding and analyzing a single static collection of text documents. Corresponding analytic activities include summarizing the contents of the collection, grouping the documents based on similarity of content, and calculating concise summaries of the resulting groups. The approach reported here focuses on taking advantage of the temporal characteristics in a text stream to identify relevant features (such as change in content), and also on the analysis and algorithmic methodology to communicate these characteristics to a user. We present a variety of algorithms for detecting essential features within a text stream. A critical finding is that the characteristics used to identify features in a text stream are uncorrelated with the characteristics used to identify features in a static document collection. Our approach for communicating the information back to the user is to identify feature (word/phrase) groups. These resulting algorithms form the basis of developing software tools for a user to analyze and understand the content of text streams. We present analysis using both news information and abstracts from technical articles, and show how these algorithms provide understanding of the contents of these text streams.

  10. Streaming Caused by Impulse Acoustic Wave

    E-print Network

    Anna Perelomova

    2002-10-07

    Five eigenvectors of the linear thermoviscous flow over the homogeneous background derived for the quasi-plane geometry of the flow. The corresponding projectors are calculated and applied to get the nonlinear evolution equations for the interacting vortical and acoustic modes. Equation on streaming cased by arbitrary acoustic wave is specified. The correspondence to the known results on streaming cased by quasi-periodic source is traced. The radiation acoustic force is calculated for the mono-polar source.

  11. Are cosmological neutrinos free-streaming?

    E-print Network

    Anders Basboll; Ole Eggers Bjaelde; Steen Hannestad; Georg G. Raffelt

    2008-06-10

    Precision data from cosmology suggest neutrinos stream freely and hence interact very weakly around the epoch of recombination. We study this issue in a simple framework where neutrinos recouple instantaneously and stop streaming freely at a redshift z_i. The latest cosmological data imply z_i 1 x 10^10 s (m_2/50 meV)^3 for the decay nu_2 -> nu_1+phi.

  12. Rotenone persistence model for montane streams

    USGS Publications Warehouse

    Brown, Peter J.; Zale, Alexander V.

    2012-01-01

    The efficient and effective use of rotenone is hindered by its unknown persistence in streams. Environmental conditions degrade rotenone, but current label instructions suggest fortifying the chemical along a stream based on linear distance or travel time rather than environmental conditions. Our objective was to develop models that use measurements of environmental conditions to predict rotenone persistence in streams. Detailed measurements of ultraviolet radiation, water temperature, dissolved oxygen, total dissolved solids (TDS), conductivity, pH, oxidationreduction potential (ORP), substrate composition, amount of organic matter, channel slope, and travel time were made along stream segments located between rotenone treatment stations and cages containing bioassay fish in six streams. The amount of fine organic matter, biofilm, sand, gravel, cobble, rubble, small boulders, slope, pH, TDS, ORP, light reaching the stream, energy dissipated, discharge, and cumulative travel time were each significantly correlated with fish death. By using logistic regression, measurements of environmental conditions were paired with the responses of bioassay fish to develop a model that predicted the persistence of rotenone toxicity in streams. This model was validated with data from two additional stream treatment reaches. Rotenone persistence was predicted by a model that used travel time, rubble, and ORP. When this model predicts a probability of less than 0.95, those who apply rotenone can expect incomplete eradication and should plan on fortifying rotenone concentrations. The significance of travel time has been previously identified and is currently used to predict rotenone persistence. However, rubble substrate, which may be associated with the degradation of rotenone by adsorption and volatilization in turbulent environments, was not previously considered.

  13. 20 CFR 234.21 - Definitions of living with and living in the same household.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... living with and living in the same household. (a) Living with. A widow(er) is considered living with... support. (b)(1) Living in the same household. An employee and spouse were living in the same household if they lived together as a married couple in the same residence. However, an employee and...

  14. 20 CFR 234.21 - Definitions of living with and living in the same household.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... living with and living in the same household. (a) Living with. A widow(er) is considered living with... support. (b)(1) Living in the same household. An employee and spouse were living in the same household if they lived together as a married couple in the same residence. However, an employee and...

  15. Io revealed in the Jovian dust streams

    E-print Network

    Amara Lynn Graps; Eberhard Grn; Harald Krger; Mih?y Hornyi; Hkan Svedhem

    2002-06-04

    The Jovian dust streams are high-speed bursts of submicron-sized particles traveling in the same direction from a source in the Jovian system. Since their discovery in 1992, they have been observed by three spacecraft: Ulysses, Galileo and Cassini. The source of the Jovian dust streams is dust from Io's volcanoes. The charged and traveling dust stream particles have particular signatures in frequency space and in real space. The frequency-transformed Galileo dust stream measurements show different signatures, varying orbit-to-orbit during Galileo's first 29 orbits around Jupiter. Time-frequency analysis demonstrates that Io is a localized source of charged dust particles. Aspects of the particles' dynamics can be seen in the December-2000 joint Galileo-Cassini dust stream measurements. To match the travel times, the smallest dust particles could have the following range of parameters: radius: 6nm, density: 1.35-1.75gr/cm$^3$, sulfur charging conditions, which produce dust stream speeds: 220|450km/sec (Galileo|Cassini) and charge potentials: 5.5|6.3Volt (Galileo|Cassini).

  16. REVISED STREAM CODE AND WASP5 BENCHMARK

    SciTech Connect

    Chen, K

    2005-05-01

    STREAM is an emergency response code that predicts downstream pollutant concentrations for releases from the SRS area to the Savannah River. The STREAM code uses an algebraic equation to approximate the solution of the one dimensional advective transport differential equation. This approach generates spurious oscillations in the concentration profile when modeling long duration releases. To improve the capability of the STREAM code to model long-term releases, its calculation module was replaced by the WASP5 code. WASP5 is a US EPA water quality analysis program that simulates one-dimensional pollutant transport through surface water. Test cases were performed to compare the revised version of STREAM with the existing version. For continuous releases, results predicted by the revised STREAM code agree with physical expectations. The WASP5 code was benchmarked with the US EPA 1990 and 1991 dye tracer studies, in which the transport of the dye was measured from its release at the New Savannah Bluff Lock and Dam downstream to Savannah. The peak concentrations predicted by the WASP5 agreed with the measurements within {+-}20.0%. The transport times of the dye concentration peak predicted by the WASP5 agreed with the measurements within {+-}3.6%. These benchmarking results demonstrate that STREAM should be capable of accurately modeling releases from SRS outfalls.

  17. Live attenuated oral cholera vaccines.

    PubMed

    Ryan, Edward T; Calderwood, Stephen B; Qadri, Firdausi

    2006-08-01

    Live, orally administered, attenuated vaccine strains of Vibrio cholerae have many theoretical advantages over killed vaccines. A single oral inoculation could result in intestinal colonization and rapid immune responses, obviating the need for repetitive dosing. Live V. cholerae organisms can also respond to the intestinal environment and immunological exposure to in vivo expressed bacterial products, which could result in improved immunological protection against wild-type V. cholerae infection. The concern remains that live oral cholera vaccines may be less effective among partially immune individuals in cholera endemic areas as pre-existing antibodies can inhibit live organisms and decrease colonization of the gut. A number of live oral cholera vaccines have been developed to protect against cholera caused by the classical and El Tor serotypes of V. cholerae O1, including CVD 103-HgR, Peru-15 and V. cholerae 638. A number of live oral cholera vaccines have also been similarly developed to protect against cholera caused by V. cholerae O139, including CVD 112 and Bengal-15. Live, orally administered, attenuated cholera vaccines are in various stages of development and evaluation. PMID:16989629

  18. Stream flow, salmon and beaver dams: roles in the structuring of stream fish communities within an anadromous salmon dominated stream.

    PubMed

    Mitchell, Sean C; Cunjak, Richard A

    2007-11-01

    The current paradigm of fish community distribution is one of a downstream increase in species richness by addition, but this concept is based on a small number of streams from the mid-west and southern United States, which are dominated by cyprinids. Further, the measure of species richness traditionally used, without including evenness, may not be providing an accurate reflection of the fish community. We hypothesize that in streams dominated by anadromous salmonids, fish community diversity will be affected by the presence of the anadromous species, and therefore be influenced by those factors affecting the salmonid population. Catamaran Brook, New Brunswick, Canada, provides a long-term data set to evaluate fish community diversity upstream and downstream of an obstruction (North American beaver Castor canadensis dam complex), which affects distribution of Atlantic salmon Salmo salar. The Shannon Weiner diversity index and community evenness were calculated for sample sites distributed throughout the brook and over 15 years. Fish community diversity was greatest upstream of the beaver dams and in the absence of Atlantic salmon. The salmon appear to depress the evenness of the community but do not affect species richness. The community upstream of the beaver dams changes due to replacement of slimy sculpin Cottus cognatus by salmon, rather than addition, when access is provided. Within Catamaran Brook, location of beaver dams and autumn streamflow interact to govern adult Atlantic salmon spawner distribution, which then dictates juvenile production and effects on fish community. These communities in an anadromous Atlantic salmon dominated stream do not follow the species richness gradient pattern shown in cyprinid-dominated streams and an alternative model for stream fish community distribution in streams dominated by anadromous salmonids is presented. This alternative model suggests that community distribution may be a function of semipermeable obstructions, streamflow and the distribution of the anadromous species affecting resident stream fish species richness, evenness, biomass and production. PMID:17922703

  19. To create live treatments of actuality : an investigation of the emerging field of live documentary practice

    E-print Network

    Fischer, Julie (Julie Lynn)

    2014-01-01

    Keywords: documentary, interactive, live, liveness, ephemerality, interactivity, theater, performance, television, televisuality, database, data, live data, real time Abstract: The field of documentary is undergoing a ...

  20. River restoration and biocoenoses improvement in two streams renaturated using bioengeneering.

    NASA Astrophysics Data System (ADS)

    Leoni, B.; Forasacco, E.; Dobner, R.; Cotta Ramusino, M.

    2003-04-01

    The Bioengineering is a constructive discipline having its own technical, ecological and environmental friendly scopes, by using living materials. The aim of this study is to assess the river restoration efficiency of Bioengineering. The basic goals of many management-concepts are the integrity of the river habitat, self-regulation and self-regeneration, the preservation of intact resources, to recreate the uniqueness, diversity and beauty of natural river landscape. From an ecological point of view the richness, diversity and age composition of the populations developing after restoration as a result of habitat improvement reveal the degree to which comprehensive concepts were applied (Jungwirth et al., 1995). The following results summarised an investigation on streams Boesio and Rancina in Valcuvia, (Varese, Northern Italy). These streams are characterised by human impacts like water pollution, river engineering and river bioengineering (palificata doppia viva). The samples of macrobenthic fauna were collected between August 2000 and July 2001 in 4 stations for each stream, where the 3rd station of Boesio and Rancina streams is characterised by bioengeneering measure, using a Surber sampler (0.125 m2, mesh size 0.45 mm). The zoobenthic communities of these pre-alpine streams are characterised by low richness and diversity and few families and genera were predominant. In Rancina stream, Ephemeroptera (genus Baetis), Trichoptera (families Hydropsychidae, Limnephilidae and Rhyacophilidae) and Diptera (families Chironomidae and Simuliidae) are present throughout the year with significant densities. The faunal composition of Boesio stream is similar. It differs, only, from stream Rancina to costant presence of Plecoptera with genus Leuctra. To evaluate the restoration of environmental quality two indices were applied: Indice Biotico Esteso (I.B.E.- Ghetti, 1995); Indice di Funzionalit Fluviale (I.F.F.- Siligardi, 2000). The E.B.I. scores of Boesio stream indicate that stations 1 and 2 are in good condition (Ecological status classification: II): therefore the level of diversity and abundance of macrobenthic taxa is slightly outside the range associated with the normal conditions and the most of the sensitive taxa of the type specific communities are present. The stations 3 and 4 are in moderate condition (Ecological status classification: III): the level of diversity and abundance of invertebrate taxa is moderately outside the normal condition range, the taxa indicative of pollution are present and many of the sensitive taxa of the type specific communities are absent. In the Rancina stream in all of the 4 stations the ecological status is indicated like moderate (Ecological status classification: III): there is a predominance of taxa more resistant at pollution and at changes in other biological components of the stream. The I.F.F. show that in Boesio stream the right shore score is moderate-good and the left shore score is moderate-poor. Differently, the Rancina stream presents the right shore with a value poor and the left shore with a wide gradient between good and poor-bad. In conclusion, we can affirm the low efficiency of Bioengineering to restore the Boesio and Rancina streams, because we cannot observe the habitat and aquatic biocoenoses improvement. An explication could be that the conversions are restricted to morphological measures, which are carried out on a small way of banks. Whereas, the restoration using the Bioengineering requires taking the entire catchment area into consideration.

  1. 16 February 2005 Stream Semantics 1 Semantics of Data

    E-print Network

    Bertini, Robert L.

    1 16 February 2005 Stream Semantics 1 Semantics of Data Streams and Operators David Maier, Jin Li Stream Semantics 2 What do you say in an invited talk? Retrospective Tutorial All the stuff you've been, reconstruction functions, monotonicity, punctuation, disorder, windows #12;2 16 February 2005 Stream Semantics 3

  2. THE USE OF GEOMORPHOLOGICAL CLASSIFICATION FOR RISK MANAGEMENT OF STREAMS

    EPA Science Inventory

    Changes in the amount and types of land use in a watershed can destabilize stream channel structure, increase sediment loading and degrade in-stream habitat. Stream classification systems (e.g., Rosgen) may be useful for determining the susceptibility of stream channel segments t...

  3. Uncovering Global Icebergs in Distributed Streams: Results and Implications

    E-print Network

    Chuah, Chen-Nee

    Uncovering Global Icebergs in Distributed Streams: Results and Implications Guanyao Huang Ashwin at Springerlink.com Abstract Discovering icebergs in distributed streams of data is an important problem these icebergs in the non-distributed streaming case or in the non-streaming distributed case, we present

  4. Adaptation Reveals Multiple Levels of Representation in Auditory Stream Segregation

    ERIC Educational Resources Information Center

    Snyder, Joel S.; Carter, Olivia L.; Hannon, Erin E.; Alain, Claude

    2009-01-01

    When presented with alternating low and high tones, listeners are more likely to perceive 2 separate streams of tones ("streaming") than a single coherent stream when the frequency separation ([delta]f) between tones is greater and the number of tone presentations is greater ("buildup"). However, the same large-[delta]f sequence reduces streaming

  5. Distributed video game streaming system for pervasive gaming

    E-print Network

    Eisert, Peter

    graphics rendering, the game output is locally rendered at the server and streamed as H.264/AVC videoDistributed video game streaming system for pervasive gaming A. Jurgelionis1 , F. Bellotti2 , A. De video game streaming system. Newly developed streaming protocols and system architectures enable

  6. 40 CFR 434.61 - Commingling of waste streams.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 40 Protection of Environment 30 2011-07-01 2011-07-01 false Commingling of waste streams. 434.61... STANDARDS Miscellaneous Provisions 434.61 Commingling of waste streams. Where waste streams from any facility covered by this part are combined for treatment or discharge with waste streams from...

  7. 40 CFR 434.61 - Commingling of waste streams.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 40 Protection of Environment 31 2012-07-01 2012-07-01 false Commingling of waste streams. 434.61... PERFORMANCE STANDARDS Miscellaneous Provisions 434.61 Commingling of waste streams. Where waste streams from any facility covered by this part are combined for treatment or discharge with waste streams...

  8. 40 CFR 434.61 - Commingling of waste streams.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 29 2010-07-01 2010-07-01 false Commingling of waste streams. 434.61... STANDARDS Miscellaneous Provisions 434.61 Commingling of waste streams. Where waste streams from any facility covered by this part are combined for treatment or discharge with waste streams from...

  9. 40 CFR 434.61 - Commingling of waste streams.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 40 Protection of Environment 30 2014-07-01 2014-07-01 false Commingling of waste streams. 434.61... PERFORMANCE STANDARDS Miscellaneous Provisions 434.61 Commingling of waste streams. Where waste streams from any facility covered by this part are combined for treatment or discharge with waste streams...

  10. 40 CFR 434.61 - Commingling of waste streams.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 40 Protection of Environment 31 2013-07-01 2013-07-01 false Commingling of waste streams. 434.61... PERFORMANCE STANDARDS Miscellaneous Provisions 434.61 Commingling of waste streams. Where waste streams from any facility covered by this part are combined for treatment or discharge with waste streams...

  11. RIPARIAN FOREST INDICATORS OF POTENTIAL FUTURE STREAM CONDITION

    EPA Science Inventory

    Large wood in streams can play an extraordinarily important role in influencing the physical structure of streams and in providing habitat for aquatic organisms. Since wood is continually lost from streams, predicting the future input of wood to streams from riparian forests is c...

  12. Differentially Private Linear Algebra in the Streaming Model Jalaj Upadhyay

    E-print Network

    International Association for Cryptologic Research (IACR)

    Differentially Private Linear Algebra in the Streaming Model Jalaj Upadhyay University of Waterloo privacy on streaming data using sketch- based algorithms. Previous works, like Dwork et al. (ICS 2010, STOC 2010), explored random sampling based streaming algorithms. We work in the well studied streaming

  13. Cache-Aware Timing Analysis of Streaming Applications

    E-print Network

    Mitra, Tulika

    Cache-Aware Timing Analysis of Streaming Applications Samarjit Chakraborty1 Tulika Mitra1 Abhik hardware and software for streaming ap- plications. Such applications process potentially infinite streams phones to set-top boxes. Given a streaming application and an architecture, the timing analysis problem

  14. Unidirectional Input/Output Streaming Complexity of Reversal and Sorting

    E-print Network

    Jain, Rahul

    Unidirectional Input/Output Streaming Complexity of Reversal and Sorting Nathanal Franois1, Sorbonne Paris-Cit, 75205 Paris, France Abstract We consider unidirectional data streams with restricted access, such as read-only and write-only streams. For read-write streams, we also introduce a new

  15. Toward a Neurophysiological Theory of Auditory Stream Segregation

    ERIC Educational Resources Information Center

    Snyder, Joel S.; Alain, Claude

    2007-01-01

    Auditory stream segregation (or streaming) is a phenomenon in which 2 or more repeating sounds differing in at least 1 acoustic attribute are perceived as 2 or more separate sound sources (i.e., streams). This article selectively reviews psychophysical and computational studies of streaming and comprehensively reviews more recent

  16. Deplump for Streaming Data Nicholas Bartlett Frank Wood

    E-print Network

    Wood, Frank

    Deplump for Streaming Data Nicholas Bartlett Frank Wood Department of Statistics, Columbia University, New York, USA Abstract We present a general-purpose, lossless compressor for streaming data asyptotics necessary for stream compression. We demonstrate the performance of this streaming deplump variant

  17. SHORT COMMUNICATION Flow rate-modified streaming effects in heterogeneous

    E-print Network

    Xuan, Xiangchun "Schwann"

    SHORT COMMUNICATION Flow rate-modified streaming effects in heterogeneous microchannels Junjie Zhu relations is developed to study the streaming potential and streaming current in heterogeneous micro or perpendicular to the flow axis. Both streaming effects are modified by the flow rate through the heterogeneous

  18. Sketching and Streaming HighDimensional Jelani Nelson

    E-print Network

    Wolfe, Patrick J.

    Sketching and Streaming High­Dimensional Vectors by Jelani Nelson S.B., Massachusetts Institute by . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Leslie A. Kolodziejski Chairman, Department Committee on Graduate Students #12; Sketching and Streaming pass over the data, a so­called streaming algorithm. Sketching and streaming have found numerous

  19. Compressive Sampling for Streaming Signals with Sparse Frequency Content

    E-print Network

    Boufounos, Petros T.

    Compressive Sampling for Streaming Signals with Sparse Frequency Content Petros Boufounos. In this paper we discuss a streaming CS framework and greedy reconstruction algorithm, the Streaming Greedy and the SGP are explicitly intended for streaming applications and signals of unknown length. The measurement

  20. Cache Write Policy for Streaming Output Data Jason Fritts

    E-print Network

    Fritts, Jason

    bottlenecks in media processing. The existence of streaming data in multimedia and the benefits of streaming evaluation that evaluates the effectiveness of various cache parameters on streaming output data in media bottlenecks in media processing. One aspect of that research has been to examine the streaming output data

  1. Analysis of Multimedia Workloads with Implications for Internet Streaming

    E-print Network

    Chen, Songqing

    and streaming ser- vices automatically for media objects hosted on standard Web sites in server farms, pseudo streaming, and streaming. Initially, multimedia objects were distributed in the same way as non-media, such as Win- dows Media Player and Real Player, support the pseudo streaming mechanism. A major limit

  2. URBAN STREAM BURIAL INCREASES WATERSHED-SCALE NITRATE EXPORT

    EPA Science Inventory

    Nitrogen (N) uptake in streams is an important ecosystem service that may be affected by the widespread burial of streams in stormwater pipes in urban watersheds. We predicted that stream burial reduces the capacity of streams to remove nitrate (NO3-) from the water column by in...

  3. Towards a Demand Driven, Autonomous Processing and Streaming Architecture Gerald Friedland and Karl Pauls

    E-print Network

    Ziegler, Günter M.

    Towards a Demand Driven, Autonomous Processing and Streaming Architecture Gerald Friedland and Karl a general processing and stream- ing architecture featuring autonomous assembly of stream- processing streaming applications and associated tools. It supports stream synchronization transparently, while

  4. Resource synergy in stream periphyton communities

    SciTech Connect

    Hill, Walter; Fanta, S.E.; Roberts, Brian J; Francoeur, Steven N.

    2011-03-01

    1. Light and nutrients play pivotal roles in determining the growth of autotrophs, yet the potential for synergistic interactions between the two resources in algal communities is poorly understood, especially in stream ecosystems. In this study, light and phosphorus were manipulated in large experimental streams to examine resource colimitation and synergy in stream periphyton. 2. Whole-stream metabolism was simultaneously limited by light and phosphorus. Increasing the supply of either light or phosphorus resulted in significant increases in primary production and the transformation of the streams from heterotrophy to autotrophy. 3. Resource-driven changes in periphyton community structure occurred in concert with changes in production. Algal assemblages in highly shaded streams were composed primarily of small diatoms such as Achnanthidium minutissima, whereas larger diatoms such as Melosira varians predominated at higher irradiances. Phosphorus enrichment had relatively little effect on assemblage structure, but it did substantially diminish the abundance of Meridion circulare, a diatom whose mucilaginous colonies were conspicuously abundant in phosphorus-poor, high-light streams. Bacterial biomass declined relative to algal biomass with increases in primary productivity, regardless of whether the increases were caused by light or phosphorus. 4. Synergistic effects on primary production appeared to occur because the availability of one resource facilitated the utilization of the other. Light increased the abundance of large diatoms, which are known to convert high concentrations of nutrients into primary production more effectively than smaller taxa. Phosphorus enrichment led to the replacement of Meridion circulare by non-mucilaginous taxa in phosphorus-enriched streams, and we hypothesize that this change enabled more efficient use of light in photosynthesis. Higher ratios of chlorophyll a : biomass in phosphorus-enriched streams may have also led to more efficient photon capture and higher photosynthetic rates. 5.Synthesis. Our results underscore the potential for resource colimitation, even in habitats where a single resource is as strongly limiting as is light in shaded streams. The capacity of autotrophic communities to respond to more than one limiting resource suggests that prevailing single-resource models of ecosystem productivity are overly simplistic.

  5. Advanced Visualization of Experimental Data in Real Time Using LiveView3D

    NASA Technical Reports Server (NTRS)

    Schwartz, Richard J.; Fleming, Gary A.

    2006-01-01

    LiveView3D is a software application that imports and displays a variety of wind tunnel derived data in an interactive virtual environment in real time. LiveView3D combines the use of streaming video fed into a three-dimensional virtual representation of the test configuration with networked communications to the test facility Data Acquisition System (DAS). This unified approach to real time data visualization provides a unique opportunity to comprehend very large sets of diverse forms of data in a real time situation, as well as in post-test analysis. This paper describes how LiveView3D has been implemented to visualize diverse forms of aerodynamic data gathered during wind tunnel experiments, most notably at the NASA Langley Research Center Unitary Plan Wind Tunnel (UPWT). Planned future developments of the LiveView3D system are also addressed.

  6. A Dualistic Stream Classification System for Oregon: In Support of a Stream Compensatory Mitigation Framework

    NASA Astrophysics Data System (ADS)

    Nadeau, T.; Wigington, P. J.; Comeleo, R. L.; Leibowitz, S. G.; Brooks, J.; Patil, S.; Sobota, D. J.

    2012-12-01

    To meet the goals of the U.S. federal Clean Water Act (CWA) and Oregon's Removal-Fill (R-F) Law, unavoidable impacts to jurisdictional waters, including streams and rivers, must be compensated for through compensatory mitigation under the CWA Section 404 and R-F permitting programs. Compensatory mitigation for impacts to the stream resource is not routinely required, as it generally is for wetlands, and that which does occur is often opportunistic or out-of-kind restoration (e.g. different stream type, wetlands) which does not provide functional replacement for impacts. As part of the effort to improve compensatory mitigation outcomes in Oregon, a stream classification system was needed to inform a more function-based, site level assessment of streams. To meet this need, we have developed a stream/watershed classification system for streams and rivers of various sizes, based in part on a hydrologic landscape classification system, addressing local assessment units, previously developed for Oregon. The system is hierarchical, expandable, and dualisticproviding information at both the local (reach) and watershed (integrative) scales. It recognizes the hydrologic and geologic drivers of stream functions, and meets several a priori criteria established to assure statewide applicability: (1) the same variables are applied regardless of geography to assure consistency across regions, (2) classification is accomplished through an automated GIS process, (3) classes do not require field verification, (4) data used are at appropriate resolution, and (5) classes are consistent with policy intent. Each stream type is defined by basic hydrologic and physical characteristics and determinants of flow regime, and reflects broad functional expectations. Because stream processes are highly influenced by watershed scale parameters, we developed watershed scale data layers to address such questions as annual water surplus availability, seasonality of surplus release, and floodplain influence. Adding a watershed component to the classification promotes consideration of watershed processes in developing and implementing an effective stream mitigation program, and informing implementation of other water-related programs.

  7. Technology for Independent Living: Sourcebook.

    ERIC Educational Resources Information Center

    Enders, Alexandra, Ed.

    This sourcebook provides information for the practical implementation of independent living technology in the everyday rehabilitation process. "Information Services and Resources" lists databases, clearinghouses, networks, research and development programs, toll-free telephone numbers, consumer protection caveats, selected publications, and

  8. Living with a Single Parent

    MedlinePLUS

    ... in the United States live with one parent. Separation and divorce are the most common reasons for this. In ... What Kids Say About: Parents What Is a Divorce? What Kids Who Are Moving Should Do Going ...

  9. Living with Carotid Artery Disease

    MedlinePLUS

    ... from the NHLBI on Twitter. Living With Carotid Artery Disease If you have carotid artery disease, you can take steps to manage the ... treatment plan, and getting ongoing care. Having carotid artery disease raises your risk of having a stroke . ...

  10. Assisted Living Federation of America

    MedlinePLUS

    ... professional networking and online tools designed to foster innovation and entrepreneurism in the field of senior living. ... Research, Aid Older Adults 11/23/2015 PACE Innovation Act Becomes Law 11/23/2015 Study: U.S. ...

  11. Living with Deep Vein Thrombosis

    MedlinePLUS

    ... page from the NHLBI on Twitter. Living With Deep Vein Thrombosis NHLBI Resources Pulmonary Embolism (Health Topics) Non-NHLBI Resources Deep Vein Thrombosis (MedlinePlus) Pulmonary Embolism (MedlinePlus) Clinical Trials ...

  12. Living with Spinal Cord Injury

    MedlinePLUS

    ... techniques that may prevent injury and disease. A spinal cord injury (SCI) can result from trauma, such as ... with daily living skills. What can persons with spinal cord injuries and their friends and families do? ? Get ...

  13. Blood Banking in Living Droplets

    E-print Network

    Samot, Josh

    Blood banking has a broad public health impact influencing millions of lives daily. It could potentially benefit from emerging biopreservation technologies. However, although vitrification has shown advantages over traditional ...

  14. StreamIt: A Compiler for Streaming Applications William Thies, Michal Karczmarek, Michael Gordon, David Maze, Jeremy Wong,

    E-print Network

    Amarasinghe, Saman

    StreamIt: A Compiler for Streaming Applications William Thies, Michal Karczmarek, Michael Gordon of Technology Cambridge, MA 02139 February 12, 2002 ABSTRACT Streaming programs represent an increasingly communication patterns, a stream program is naturally written as a set of concurrent filters with regular steady

  15. Quality control in the recycling stream of PVC from window frames by hyperspectral imaging

    NASA Astrophysics Data System (ADS)

    Luciani, Valentina; Serranti, Silvia; Bonifazi, Giuseppe; Di Maio, Francesco; Rem, Peter

    2013-05-01

    Polyvinyl chloride (PVC) is one of the most commonly used thermoplastic materials in respect to the worldwide polymer consumption. PVC is mainly used in the building and construction sector, products such as pipes, window frames, cable insulation, floors, coverings, roofing sheets, etc. are realised utilising this material. In recent years, the problem of PVC waste disposal gained increasing importance in the public discussion. The quantity of used PVC items entering the waste stream is gradually increased as progressively greater numbers of PVC products approach to the end of their useful economic lives. The quality of the recycled PVC depends on the characteristics of the recycling process and the quality of the input waste. Not all PVC-containing waste streams have the same economic value. A transparent relation between value and composition is required to decide if the recycling process is cost effective for a particular waste stream. An objective and reliable quality control technique is needed in the recycling industry for the monitoring of both recycled flow streams and final products in the plant. In this work hyperspectral imaging technique in the near infrared (NIR) range (1000-1700 nm) was applied to identify unwanted plastic contaminants and rubber present in PVC coming from windows frame waste in order to assess a quality control procedure during its recycling process. Results showed as PVC, PE and rubber can be identified adopting the NIR-HSI approach.

  16. [Passive euthanasia and living will].

    PubMed

    Julesz, Mt

    2014-07-01

    This article deals with the intentional distinction between murder of first degree and passive euthanasia. In Hungary, active euthanasia is considered to be a murder of first degree, whilst the Netherlands, Belgium, Luxemburg and Switzerland have legalized the active form of mercy killing in Europe. The palliative terminal care, when e.g. giving pain-killer morphine to the patient, might result in decreasing the patient's life-span, and thus causing indirect euthanasia. However, the legal institution of living will exists in several counter-euthanasia countries. The living will allows future patients to express their decision in advance to refuse a life-sustaining treatment, e.g. in case of irreversible coma. The institution of living will exists in Germany and in Hungary too. Nevertheless, the formal criteria of living will make it hardly applicable. The patient ought to express his/her will before a notary public in advance, and he/she should hand it over when being hospitalized. If the patient is not able to present his/her living will to his/her doctor in the hospital, then his/her only hope remains that he/she has given a copy of the living will to the family doctor previously, and the family doctor will notify the hospital. PMID:24974840

  17. Grazing management effects on stream bank erosion and phosphorus delivery to a pasture stream

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Pasture lands may deliver significant sediment and phosphorus (P) to surface waters. To determine the effects of beef (Bos taurus) grazing practices on stream bank erosion and P losses, three treatments [rotational stocking (RS), continuous stocking with restricted stream access (CSR), and continuou...

  18. BlueStreaming: Towards Power-Efficient Internet P2P Streaming to Mobile Devices

    E-print Network

    Chen, Songqing

    . These lead to exces- sive battery power consumption on the mobile device. In this paper, we first conduct streaming services. The experimental results show that BlueStreaming can save up to 46% battery power com more Internet traf- fic than iPhone users for accessing popular services such as US- AToday, Google

  19. DIATOM SPECIES RICHNESS IN STREAMS OF THE EASTERN US: STREAM SIZE AND HABITAT EFFECTS

    EPA Science Inventory

    We analyzed the relationship between benthic diatom assemblages, stream size, and habitat characteristics in 445 first through seventh order streams in the Mid-Atlantic (n=230), South Atlantic (n=61), Ohio (n=140), and Tennessee (n=14) hydrologic regions. Diatom samples were col...

  20. VIDEO STREAM INTEGRATION The integration of video streams and the 3-

    E-print Network

    Shahabi, Cyrus

    VIDEO STREAM INTEGRATION The integration of video streams and the 3- D model allows the user (cshahabi@cs.usc.edu) Craig Knoblock (knoblock@isi.edu) Ulrich Neumann (uneumann@usc.edu) Ram Nevatia (nevatia@usc.edu) Suya You (suyay@imsc.usc.edu) Staff Yao-Yi Chiang (yaoyichi@isi.edu) Kelvin Chung

  1. Modeling Fluvial Response to In-stream Woody Vegetation: Implications for Stream Corridor Restoration

    Technology Transfer Automated Retrieval System (TEKTRAN)

    River restoration and bank stabilization programs often use vegetation for improving stream corridor habitat, aesthetic, and function. Yet no study has examined the use of managed vegetation plantings to transform a straight, degraded stream corridor into a more functional, aesthetically-pleasing m...

  2. Perspectives on ecological research at the Outdoor StreamLab, a field-scale experimental stream

    NASA Astrophysics Data System (ADS)

    Merten, E. C.; Dieterman, D.; Kramarczuk, K.; Lightbody, A.; Orr, C. H.; Wellnitz, T.

    2009-12-01

    Artificial streams hold great promise for examining ecological processes. They lend themselves to manipulations of discharge, sediment load, water chemistry, and other parameters difficult or impossible to control in natural streams. However, artificial streams also have important limitations. In this presentation we describe insights gained from several ecological studies conducted at the St. Anthony Falls Laboratorys Outdoor StreamLab, including, 1) short-term turbidity exposure effects on fish health, 2) macroinvertebrate grazing rates on periphyton as a function of velocity, 3) rates of macroinvertebrate colonization as related to velocity, and 4) fine-scale correlations of periphytic biomass with hydraulic conditions. Several lessons emerge from these initial attempts at ecological research in the Outdoor StreamLab. We have learned that the size, flow rate, substrate, water chemistry, and available colonization population of the artificial stream limit the kinds of organisms and types of ecological processes that can be examined and the types of experiments that can be run. We suggest that short-term biotic responses are best for study in a system of this type, and note that constant experiment maintenance is essential. Operating artificial streams to meet the needs of multiple researchers also presents challenges of scheduling, coordination, and conflict resolution. Although ecological research in artificial streams has considerable potential, the planning required is no less than that of traditional field studies.

  3. Statistical model of meteor streams. IV - A study of radio streams from the synoptic year

    NASA Technical Reports Server (NTRS)

    Sekanina, Z.

    1976-01-01

    The paper gives a detailed description of a search procedure for radio meteor streams and reports the detection of 275 streams in a synoptic-year sample of 19,698 radio meteors observed by the radar system of the Radio Meteor Project at Havana, Illinois. The orbital elements and related parameters of the detected streams are presented, the two parameters of the D-distribution of the streams are determined, and their mean radiants are plotted. Possible associations between the streams and possible parent objects are identified; it is found that streams may be associated with seven periodic comets, five other comets, at least nine asteroids (especially Adonis), and several fireballs. The mean space density in the streams is found to be much lower than the sporadic density, although the central density may be considerably greater than the sporadic density. It is shown that the derived absolute stream-density values are in agreement with the order of magnitude of the space densities estimated from cometary production rates for solid material of comparable particle size.

  4. Comparing Streaming Video and Videotapes: Can Streaming Video Convey Affective Meaning as Well as Videotape?

    ERIC Educational Resources Information Center

    Cofield, Jay L.

    This study investigated whether or not low-bandwidth streaming video could be useful for affective purposes. A group of 30 students in a cinema course at a public, liberal arts university viewed a 10-minute dramatic video scene by either videotape or low-bandwidth streaming video. They also took a survey to determine their affective responses and

  5. Streaming Media Seminar--Effective Development and Distribution of Streaming Multimedia in Education

    ERIC Educational Resources Information Center

    Mainhart, Robert; Gerraughty, James; Anderson, Kristine M.

    2004-01-01

    Concisely defined, "streaming media" is moving video and/or audio transmitted over the Internet for immediate viewing/listening by an end user. However, at Saint Francis University's Center of Excellence for Remote and Medically Under-Served Areas (CERMUSA), streaming media is approached from a broader perspective. The working definition includes

  6. Streaming in Flemish Secondary Schools: Exploring Teachers' Perceptions of and Adaptations to Students in Different Streams

    ERIC Educational Resources Information Center

    Stevens, Peter A. J.; Vermeersch, Hans

    2010-01-01

    A rich body of research on streaming or tracking conducted mainly in the USA and UK suggests that teachers have lower expectations of students in lower education streams and adapt their curriculum and pedagogy in line with such expectations. Recent large-scale quantitative research conducted in Flanders (Belgium) shows that teachers teaching in

  7. EFFECTS OF STREAM RESTORATION ON IN-STREAM WATER QUALITY IN AN URBAN WATERSHED

    EPA Science Inventory

    The purpose of this on-going project is to provide information to Municipal Separate Storm Sewer System (MS4s) operators and states on the performance of selected best management practices (BMPs), specifically, stream restoration techniques, on improving biological and in-stream ...

  8. In-stream Physical Heterogeneity, Rainfall Aided Flushing, and Discharge on Stream Water Quality.

    PubMed

    Gomes, Pattiyage I A; Wai, Onyx W H

    2015-08-01

    Implications of instream physical heterogeneity, rainfall-aided flushing, and stream discharge on water quality control have been investigated in a headwater stream of a climatic region that has contrasting dry and wet seasons. Dry (low flow) season's physical heterogeneity showed a positive correlation with good water quality. However, in the wet season, physical heterogeneity showed minor or no significance on water quality variations. Furthermore, physical heterogeneity appeared to be more complementary with good water quality subsequent to rainfall events. In many cases stream discharge was a reason for poor water quality. For the dry season, graywater inputs to the stream could be held responsible. In the wet season, it was probably the result of catchment level disturbances (e.g., regulation of ephemeral freshwater paths). Overall, this study revealed the importance of catchment-based approaches on water quality improvement in tandem with in-stream approaches framed on a temporal scale. PMID:26237692

  9. New insights into hydrological connectivity in the hillslope-riparian-stream system through the use of terrestrial diatoms

    NASA Astrophysics Data System (ADS)

    Martnez-Carreras, Nria; Wetzel, Carlos E.; Frentress, Jay; Tauro, Flavia; Coles, Anna; Ector, Luc; McDonnell, Jeffrey J.; Hoffmann, Lucien; Pfister, Laurent

    2013-04-01

    Diatoms (Bacillariophyta), one of the most common and diverse algal groups (ca. 200000 species, ~10-200 m, unicellular, eukaryotic algae), have recently been used as novel, natural tracers to infer connectivity in the hillslope-riparian-stream system. In the schistous Weierbach catchment (0.45 km2, NW Luxembourg), terrestrial diatom abundance in the stream systematically increased with precipitation during several events, suggesting rapid connectivity between the soil surface and stream water. Nevertheless, a marginal contribution of overland flow to stream water was determined using end-member mixing analysis with geochemical and water isotope tracers. These contradictory results raised new questions regarding how terrestrial diatoms, living on the soil surface, reached the stream network. Taking into consideration that no diatoms were found in groundwater samples, we first hypothesised that flushing of the terrestrial diatoms may take place through networks of macropores in the shallow soils of the catchment. This hypothesis was tested by conducting laboratory percolation experiments with fluorescent diatoms (see contribution by Tauro et al. in session HS2.4) and results suggest that diatom flushing through the soil cores does not occur. A second hypothesis arose when performing simulated rainfall events to determine diatom population depletion. Simulated rainfall experiments showed that terrestrial diatom populations in the riparian zone deplete in response to rainfall. These field and laboratory experimental results suggest that terrestrial diatoms may reach the stream suspended in event water via - yet undocumented - surface or near-surface pathways. Surface saturated and subsurface mixing processes in the riparian zone are currently being investigated in the catchment using water isotope and geochemical tracers, infrared thermography and piezometers (see contribution by Frentress et al. in session HS2.4). Further research will focus on pathways that terrestrial diatoms located further from the stream network (i.e. hillslopes) use to reach the stream. Ultimately, we seek to combine these results from multi-tracer studies to develop an improved, holistic understanding of catchment behaviour.

  10. Plant genes link forests and streams

    NASA Astrophysics Data System (ADS)

    Leroy, C. J.; Whitham, T. G.; Keim, P.; Marks, J. C.

    2005-05-01

    Recent terrestrial research demonstrates the importance of genetic variation within tree species such as oaks, aspen and cottonwoods in affecting the function of forest ecosystems. We show similarly that genetic variation within cottonwoods can affect stream ecosystem function through litterfall. The genetic makeup of cottonwood leaf litter directly affects in-stream leaf decomposition rates, aquatic fungal accumulation and macroinvertebrate assemblages. This genetic variation is especially important in the western United States because cottonwoods are a dominant riparian tree and are currently in dramatic decline. In western rivers, cottonwood genetic diversity may be elevated due to naturally-occurring hybridization zones. We collected litter from five genotypes of each of four cottonwood cross types from common garden trees and measured decomposition rates using litterbag techniques in the Weber River (UT). Among the cottonwood genotypes decomposition rates ranged on average from 0.0077 0.0003 day-1 for backcross to P. angustifolia hybrids to 0.0105 0.0003 day-1 for P. fremontii. Similar and substantial differences among F1 and backcross hybrids provide evidence for genetic control over in-stream decomposition rates. Prior studies have shown that species diversity influences litter quality and stream function. This study extends this by linking genetic diversity to stream ecosystem function.

  11. Jet Noise Scaling in Dual Stream Nozzles

    NASA Technical Reports Server (NTRS)

    Khavaran, Abbas; Bridges, James

    2010-01-01

    Power spectral laws in dual stream jets are studied by considering such flows a superposition of appropriate single-stream coaxial jets. Noise generation in each mixing region is modeled using spectral power laws developed earlier for single stream jets as a function of jet temperature and observer angle. Similarity arguments indicate that jet noise in dual stream nozzles may be considered as a composite of four single stream jets representing primary/secondary, secondary/ambient, transition, and fully mixed zones. Frequency filter are designed to highlight spectral contribution from each jet. Predictions are provided at an area ratio of 2.0--bypass ratio from 0.80 to 3.40, and are compared with measurements within a wide range of velocity and temperature ratios. These models suggest that the low frequency noise in unheated jets is dominated by the fully mixed region at all velocity ratios, while the high frequency noise is dominated by the secondary when the velocity ratio is larger than 0.80. Transition and fully mixed jets equally dominate the low frequency noise in heated jets. At velocity ratios less than 0.50, the high frequency noise from primary/bypass becomes a significant contributing factor similar to that in the secondary/ambient jet.

  12. The economic value of stream restoration

    NASA Astrophysics Data System (ADS)

    Collins, Alan; Rosenberger, Randy; Fletcher, Jerald

    2005-02-01

    The economic value of restoring Deckers Creek in Monongalia and Preston counties of West Virginia was determined from mail, Internet, and personal contact surveys. Multiattribute, choice experiments were conducted and nested logit models were estimated to derive the economic values of full restoration for three attributes of this creek: aquatic life, swimming, and scenic quality. Their relative economic values were that aquatic life > scenic quality ~ swimming. These economic values imply that respondents had the highest value for aquatic life when fully restoring Deckers Creek to a sustainable fishery rather than a ``put and take'' fishery that cannot sustain fish populations. The welfare improvement estimates for full restoration of all three attributes ranged between $12 and $16 per month per household. Potential stream users (anglers) had the largest welfare gain from restoration, while nonangler respondents had the lowest. When these estimates were aggregated up to the entire watershed population, the benefit from restoration of Deckers Creek was estimated to be about $1.9 million annually. This benefit does not account for any economic values from partial stream restoration. On the basis of log likelihood tests of the nested logit models, two subsamples of the survey population (the general population and stream users) were found to be from the same population. Thus restoration choices by stream users may be representative of the watershed population, although the sample size of stream users was small in this research.

  13. The economic value of stream restoration

    NASA Astrophysics Data System (ADS)

    Collins, Alan; Rosenberger, Randy; Fletcher, Jerald

    2005-02-01

    The economic value of restoring Deckers Creek in Monongalia and Preston counties of West Virginia was determined from mail, Internet, and personal contact surveys. Multiattribute, choice experiments were conducted and nested logit models were estimated to derive the economic values of full restoration for three attributes of this creek: aquatic life, swimming, and scenic quality. Their relative economic values were that aquatic life > scenic quality ? swimming. These economic values imply that respondents had the highest value for aquatic life when fully restoring Deckers Creek to a sustainable fishery rather than a "put and take" fishery that cannot sustain fish populations. The welfare improvement estimates for full restoration of all three attributes ranged between 12 and 16 per month per household. Potential stream users (anglers) had the largest welfare gain from restoration, while nonangler respondents had the lowest. When these estimates were aggregated up to the entire watershed population, the benefit from restoration of Deckers Creek was estimated to be about $1.9 million annually. This benefit does not account for any economic values from partial stream restoration. On the basis of log likelihood tests of the nested logit models, two subsamples of the survey population (the general population and stream users) were found to be from the same population. Thus restoration choices by stream users may be representative of the watershed population, although the sample size of stream users was small in this research.

  14. High-acuity spatial stream segregation.

    PubMed

    Middlebrooks, John C

    2013-01-01

    In a complex auditory scene, location in space is one of several acoustic features that permit listeners to segregate competing sequences of sounds into discrete perceptual streams. Nevertheless, the spatial acuity of stream segregation is unknown. Moreover, it is not clear whether this is really a spatial effect or whether it reflects a binaural process that only indirectly involves space. We employed "rhythmic masking release" as an objective measure of spatial stream segregation. That task revealed spatial acuity nearly as fine as listeners' discriminations of static locations (i.e., their minimum audible angles). Tests using low-pass, high-pass, and varying-level conditions in the horizontal dimension demonstrated that binaural difference cues provide finer acuity than does any monaural cue and that low-frequency interaural delay cues give finer acuity than do high-frequency interaural level differences. Surprisingly, stream segregation in the vertical dimension, where binaural difference cues are negligible, could be nearly as acute as that in the horizontal dimension. The results show a common spatial underpinning to performance. Nevertheless, a dissociation across conditions between localization acuity and masking-release thresholds suggests that spatial stream segregation is accomplished by brain systems discrete from those responsible for sound-localization judgments. PMID:23716256

  15. Microbial biodiversity in glacier-fed streams

    PubMed Central

    Wilhelm, Linda; Singer, Gabriel A; Fasching, Christina; Battin, Tom J; Besemer, Katharina

    2013-01-01

    While glaciers become increasingly recognised as a habitat for diverse and active microbial communities, effects of their climate change-induced retreat on the microbial ecology of glacier-fed streams remain elusive. Understanding the effect of climate change on microorganisms in these ecosystems is crucial given that microbial biofilms control numerous stream ecosystem processes with potential implications for downstream biodiversity and biogeochemistry. Here, using a space-for-time substitution approach across 26 Alpine glaciers, we show how microbial community composition and diversity, based on 454-pyrosequencing of the 16S rRNA gene, in biofilms of glacier-fed streams may change as glaciers recede. Variations in streamwater geochemistry correlated with biofilm community composition, even at the phylum level. The most dominant phyla detected in glacial habitats were Proteobacteria, Bacteroidetes, Actinobacteria and Cyanobacteria/chloroplasts. Microorganisms from ice had the lowest ? diversity and contributed marginally to biofilm and streamwater community composition. Rather, streamwater apparently collected microorganisms from various glacial and non-glacial sources forming the upstream metacommunity, thereby achieving the highest ? diversity. Biofilms in the glacier-fed streams had intermediate ? diversity and species sorting by local environmental conditions likely shaped their community composition. ? diversity of streamwater and biofilm communities decreased with elevation, possibly reflecting less diverse sources of microorganisms upstream in the catchment. In contrast, ? diversity of biofilms decreased with increasing streamwater temperature, suggesting that glacier retreat may contribute to the homogenisation of microbial communities among glacier-fed streams. PMID:23486246

  16. Mechanical guidance through cell-cell and cell-surface contact during multicellular streaming

    NASA Astrophysics Data System (ADS)

    Wang, Chenlu; Driscoll, Meghan; Gupta, Satyandra K.; Parent, Carole; Losert, Wolfgang

    2014-03-01

    During collective cell migration, mechanical forces arise from the extracellular matrix (ECM) through cell-surface contact and from other cells through cell-cell contact. These forces regulate the motion of migrating cell groups. To determine how these mechanical interactions balance during cell migration, we measured the shape dynamics of Dictyostelium discoideum cells at the multicellular streaming stage. We found that cells can coordinate their motion by synchronizing protrusion waves that travel along their membranes when they form proper cell-cell adhesion and cell-surface adhesion. In addition, our experiments on live actin labeled cells show that intracellular actin polymerization actively responds to the change of cell-cell/surface adhesion and helps to stabilize multicellular migration streams. Our finding suggests that the coordination of motion between neighboring cells in collective migration requires a balance between cell-cell adhesion and cell-surface adhesion, and that the cell cytoskeleton plays an important role in this balance.

  17. The Impact of Point-Source Pollution on the Concentration and Distribution of Escherichia coli in a Stream Draining an Urban Watershed

    E-print Network

    poultry processing plant would lead to an increase in the concentration of total coliform and E. coli downstream from the point of discharge. Our study focused on two categories of E. coli: "free-living" E. coli found in surface water samples and "attached" E. coli found on rocks located in the stream. We also

  18. 1692 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, VOL. 18, NO. 12, DECEMBER 2008 TrustStream: A Secure and Scalable Architecture for

    E-print Network

    Wu, Dapeng Oliver

    . Deployed by ChinaCache, the largest CDN provider in China, TrustStream has broadcasted several popular live1692 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, VOL. 18, NO. 12, DECEMBER 2008 the best features of scalable coding, content distribution network (CDN) and peer-to-peer (P2P) networks

  19. Don't Cross the (Tidal) Streams

    NASA Astrophysics Data System (ADS)

    Kohler, Susanna

    2015-09-01

    In a tidal disruption event (TDE), an unfortunate star passes too close to a dormant supermassive black hole (BH) and gets torn apart by tidal forces, feeding the BH for a short time. Oddly, were not finding nearly as many TDEs typically detected due to their distinctive observational signatures as theory says we should. A recent study suggests that we might be missing many of these events, due to the way the streams of shredded stars fall onto the BHs.Signatures of ShreddingWhen a BH tears a star apart, the stars material is stretched out into whats known as a tidal stream. That stream continues on a trajectory around the BH, with roughly half the material eventually falling back on the BH, whipping around it in a series of orbits. Where those orbits intersect each other, the material smashes together and circularizes, forming a disk that then accretes onto the BH.What does a TDE look like? We dont observe anything until after the tidal streams collide and the material begins to accrete onto the BH. At that point we observe a sudden peak in luminosity, which then gradually decreases (scaling roughly as time-5/3) as the tail end of whats left of the star accretes and the BHs food source eventually runs out.So why have we only been observing about a tenth as many TDEs as theory predicts we should see? By studying the structure of tidal streams in TDEs, James Guillochon (Harvard-Smithsonian Center for Astrophysics) and Enrico Ramirez-Ruiz (UC Santa Cruz) have found a potential reason and the culprit is general relativity.Dark YearsThe authors run a series of simulations of TDEs around black holes of varying masses and spins to see what form the resulting tidal streams take over time. They find that precession of the tidal stream due to the BHs gravitational effects changes how the stream interacts with itself, and therefore what we observe. Some cases behave like what we expect for whats currently considered a typical TDE but some dont.Example from simulations of a tidal streams path around the black hole. Relativistic precession causes this tidal stream to wind around the black hole 13 times before it finally collides with itself. [GuillochonRamirez-Ruiz 2015]For cases where the relativistic effects are small (such as BHs with masses less than a few 106 solar masses), the tidal stream collides with itself after only a few windings around the BH, quickly forming a disk. The disk forms far from the BH, however, so it takes a long time to accrete. As a result, the observed flare can take 100 times longer to peak than whats typically expected for a TDE, so we might be failing to identify these sources as TDEs.Furthermore, for cases where the BH is both massive and has a spin of a 0.2, the tidal stream doesnt collide with itself right away. Instead, it can take many windings around the BH before the first intersection. In these cases, it may potentially be years after a star gets ripped apart before the material accretes and were able to observe the event!CitationJames Guillochon and Enrico Ramirez-Ruiz 2015 ApJ 809 166. doi:10.1088/0004-637X/809/2/166

  20. Waste streams in a crewed space habitat

    NASA Technical Reports Server (NTRS)

    Wydeven, T.; Golub, M. A.

    1991-01-01

    A judicious compilation of generation rates and chemical compositions of potential waste feed streams in a typical crewed space habitat was made in connection with the waste-management aspect of NASA's Physical/Chemical Closed-Loop Life Support Program. Waste composition definitions are needed for the design of waste-processing technologies involved in closing major life support functions in future long-duration human space missions. Tables of data for the constituents and chemical formulas of the following waste streams are presented and discussed: human urine, feces, hygiene (laundry and shower) water, cleansing agents, trash, humidity condensate, dried sweat, and trace contaminants. Tables of data on dust generation and pH values of the different waste streams are also presented and discussed.

  1. Don't Cross the (Tidal) Streams

    NASA Astrophysics Data System (ADS)

    Kohler, Susanna

    2016-01-01

    In a tidal disruption event (TDE), an unfortunate star passes too close to a dormant supermassive black hole (BH) and gets torn apart by tidal forces, feeding the BH for a short time. Oddly, were not finding nearly as many TDEs typically detected due to their distinctive observational signatures as theory says we should. A recent study suggests that we might be missing many of these events, due to the way the streams of shredded stars fall onto the BHs.Signatures of ShreddingWhen a BH tears a star apart, the stars material is stretched out into whats known as a tidal stream. That stream continues on a trajectory around the BH, with roughly half the material eventually falling back on the BH, whipping around it in a series of orbits. Where those orbits intersect each other, the material smashes together and circularizes, forming a disk that then accretes onto the BH.What does a TDE look like? We dont observe anything until after the tidal streams collide and the material begins to accrete onto the BH. At that point we observe a sudden peak in luminosity, which then gradually decreases (scaling roughly as time-5/3) as the tail end of whats left of the star accretes and the BHs food source eventually runs out.So why have we only been observing about a tenth as many TDEs as theory predicts we should see? By studying the structure of tidal streams in TDEs, James Guillochon (Harvard-Smithsonian Center for Astrophysics) and Enrico Ramirez-Ruiz (UC Santa Cruz) have found a potential reason and the culprit is general relativity.Dark YearsThe authors run a series of simulations of TDEs around black holes of varying masses and spins to see what form the resulting tidal streams take over time. They find that precession of the tidal stream due to the BHs gravitational effects changes how the stream interacts with itself, and therefore what we observe. Some cases behave like what we expect for whats currently considered a typical TDE but some dont.Example from simulations of a tidal streams path around the black hole. Relativistic precession causes this tidal stream to wind around the black hole 13 times before it finally collides with itself. [GuillochonRamirez-Ruiz 2015]For cases where the relativistic effects are small (such as BHs with masses less than a few 106 solar masses), the tidal stream collides with itself after only a few windings around the BH, quickly forming a disk. The disk forms far from the BH, however, so it takes a long time to accrete. As a result, the observed flare can take 100 times longer to peak than whats typically expected for a TDE, so we might be failing to identify these sources as TDEs.Furthermore, for cases where the BH is both massive and has a spin of a 0.2, the tidal stream doesnt collide with itself right away. Instead, it can take many windings around the BH before the first intersection. In these cases, it may potentially be years after a star gets ripped apart before the material accretes and were able to observe the event!CitationJames Guillochon and Enrico Ramirez-Ruiz 2015 ApJ 809 166. doi:10.1088/0004-637X/809/2/166

  2. Programmable stream prefetch with resource optimization

    SciTech Connect

    Boyle, Peter; Christ, Norman; Gara, Alan; Mawhinney, Robert; Ohmacht, Martin; Sugavanam, Krishnan

    2013-01-08

    A stream prefetch engine performs data retrieval in a parallel computing system. The engine receives a load request from at least one processor. The engine evaluates whether a first memory address requested in the load request is present and valid in a table. The engine checks whether there exists valid data corresponding to the first memory address in an array if the first memory address is present and valid in the table. The engine increments a prefetching depth of a first stream that the first memory address belongs to and fetching a cache line associated with the first memory address from the at least one cache memory device if there is not yet valid data corresponding to the first memory address in the array. The engine determines whether prefetching of additional data is needed for the first stream within its prefetching depth. The engine prefetches the additional data if the prefetching is needed.

  3. Digital Multicasting of Multiple Audio Streams

    NASA Technical Reports Server (NTRS)

    Macha, Mitchell; Bullock, John

    2007-01-01

    The Mission Control Center Voice Over Internet Protocol (MCC VOIP) system (see figure) comprises hardware and software that effect simultaneous, nearly real-time transmission of as many as 14 different audio streams to authorized listeners via the MCC intranet and/or the Internet. The original version of the MCC VOIP system was conceived to enable flight-support personnel located in offices outside a spacecraft mission control center to monitor audio loops within the mission control center. Different versions of the MCC VOIP system could be used for a variety of public and commercial purposes - for example, to enable members of the general public to monitor one or more NASA audio streams through their home computers, to enable air-traffic supervisors to monitor communication between airline pilots and air-traffic controllers in training, and to monitor conferences among brokers in a stock exchange. At the transmitting end, the audio-distribution process begins with feeding the audio signals to analog-to-digital converters. The resulting digital streams are sent through the MCC intranet, using a user datagram protocol (UDP), to a server that converts them to encrypted data packets. The encrypted data packets are then routed to the personal computers of authorized users by use of multicasting techniques. The total data-processing load on the portion of the system upstream of and including the encryption server is the total load imposed by all of the audio streams being encoded, regardless of the number of the listeners or the number of streams being monitored concurrently by the listeners. The personal computer of a user authorized to listen is equipped with special- purpose MCC audio-player software. When the user launches the program, the user is prompted to provide identification and a password. In one of two access- control provisions, the program is hard-coded to validate the user s identity and password against a list maintained on a domain-controller computer at the MCC. In the other access-control provision, the program verifies that the user is authorized to have access to the audio streams. Once both access-control checks are completed, the audio software presents a graphical display that includes audiostream-selection buttons and volume-control sliders. The user can select all or any subset of the available audio streams and can adjust the volume of each stream independently of that of the other streams. The audio-player program spawns a "read" process for the selected stream(s). The spawned process sends, to the router(s), a "multicast-join" request for the selected streams. The router(s) responds to the request by sending the encrypted multicast packets to the spawned process. The spawned process receives the encrypted multicast packets and sends a decryption packet to audio-driver software. As the volume or muting features are changed by the user, interrupts are sent to the spawned process to change the corresponding attributes sent to the audio-driver software. The total latency of this system - that is, the total time from the origination of the audio signals to generation of sound at a listener s computer - lies between four and six seconds.

  4. Conversion method for gas streams containing hydrocarbons

    DOEpatents

    Mallinson, Richard G. (Norman, OK); Lobban, Lance (Norman, OK); Liu, Chang-jun (Tianjin, CN)

    2000-01-01

    An apparatus and a method of using the apparatus are provided for converting a gas stream containing hydrocarbons to a reaction product containing effluent molecules having at least one carbon atom, having at least one interior surface and at least one exterior surface, a first electrode and a second electrode with the first and second electrodes being selectively movable in relation to each other and positioned within the housing so as to be spatially disposed a predetermined distance from each other, a plasma discharge generator between the first and second electrodes, gas stream introducer and a collector for collecting the reaction product effluent produced by the reaction of the gas stream containing hydrocarbons with the plasma discharge between the first and second electrodes.

  5. Apparatus for focusing flowing gas streams

    DOEpatents

    Nogar, N.S.; Keller, R.A.

    1985-05-20

    Apparatus for focusing gas streams. The principle of hydrodynamic focusing is applied to flowing gas streams in order to provide sample concentration for improved photon and sample utilization in resonance ionization mass spectrometric analysis. In a concentric nozzle system, gas samples introduced from the inner nozzle into the converging section of the outer nozzle are focused to streams 50-250-..mu..m in diameter. In some cases diameters of approximately 100-..mu..m are maintained over distances of several centimeters downstream from the exit orifice of the outer nozzle. The sheath gas employed has been observed to further provide a protective covering around the flowing gas sample, thereby isolating the flowing gas sample from possible unwanted reactions with nearby surfaces. A single nozzle variation of the apparatus for achieving hydrodynamic focusing of gas samples is also described.

  6. On why gravel bed streams are paved

    SciTech Connect

    Parker, G.; Klingeman, P.C.

    1982-10-01

    Bedload transport in poorly sorted gravel bed streams downstream of dams is considered. Bedload and typical bed material (subpavement) size distributions are observed to be similar; it follows that the coarse half of the subpavement moves through a reach at a rate near that of the fine half. Since coarser grains are intrinsically less mobile than fine grains, it follows that some mechanism must act to nearly equalize mobility. It is hypothesized that the pavement seen in gravel bed streams at low flow is in fact in place during typical transport events capable of moving all available sizes. This pavement can provide the equalizing mechanism by exposing proportionally more coarse grains to the flow. Field data are used to quantify this concept and to develop a predictive relation for river pavement. The model indicates that pavement should be absent in most sand bed streams, in agreement with observation.

  7. On the genealogy of the Orphan Stream

    NASA Astrophysics Data System (ADS)

    Sales, Laura V.; Helmi, Amina; Starkenburg, Else; Morrison, Heather L.; Engle, Ethan; Harding, Paul; Mateo, Mario; Olszewski, Edward W.; Sivarani, Thirupathi

    2008-09-01

    We use N-body simulations to explore the origin and a plausible orbit for the Orphan Stream, one of the faintest substructures discovered so far in the outer halo of our Galaxy. We are able to reproduce its position, velocity and distance measurements by appealing to a single wrap of a double-component satellite galaxy. We find that the progenitor of the Orphan Stream could have been an object similar to today's Milky Way dwarfs, such as Carina, Draco, LeoII or Sculptor; and unlikely to be connected to Complex A or Ursa MajorII. Our models suggest that such progenitors, if accreted on orbits with apocentres smaller than ~35 kpc, are likely to give rise to very low surface brightness streams, which may be hiding in the outer halo and remain largely undetected with current techniques. The systematic discovery of these ghostly substructures may well require wide field spectroscopic surveys of the Milky Way's outer stellar halo.

  8. On the genealogy of the Orphan Stream

    E-print Network

    L. V. Sales; A. Helmi; E. Starkenburg; H. L. Morrison; E. Engle; P. Harding; M. Mateo; E. W. Olszewski; T. Sivarani

    2008-07-30

    We use N-body simulations to explore the origin and a plausible orbit for the Orphan Stream, one of the faintest substructures discovered so far in the outer halo of our Galaxy. We are able to reproduce its position, velocity and distance measurements by appealing to a single wrap of a double-component satellite galaxy. We find that the progenitor of the Orphan Stream could have been an object similar to today's Milky Way dwarfs, such as Carina, Draco, Leo II or Sculptor; and unlikely to be connected to Complex A or Ursa Major II. Our models suggest that such progenitors, if accreted on orbits with apocenters smaller than ~35 kpc, are likely to give rise to very low surface brightness streams, which may be hiding in the outer halo and remain largely undetected with current techniques. The systematic discovery of these ghostly substructures may well require wide field spectroscopic surveys of the Milky Way's outer stellar halo.

  9. On the genealogy of the Orphan Stream

    E-print Network

    Sales, L V; Starkenburg, E; Morrison, H L; Engle, E; Harding, P; Mateo, M; Olszewski, E W; Sivarani, T

    2008-01-01

    We use N-body simulations to explore the origin and a plausible orbit for the Orphan Stream, one of the faintest substructures discovered so far in the outer halo of our Galaxy. We are able to reproduce its position, velocity and distance measurements by appealing to a single wrap of a double-component satellite galaxy. We find that the progenitor of the Orphan Stream could have been an object similar to today's Milky Way dwarfs, such as Carina, Draco, Leo II or Sculptor; and unlikely to be connected to Complex A or Ursa Major II. Our models suggest that such progenitors, if accreted on orbits with apocenters smaller than ~35 kpc, are likely to give rise to very low surface brightness streams, which may be hiding in the outer halo and remain largely undetected with current techniques. The systematic discovery of these ghostly substructures may well require wide field spectroscopic surveys of the Milky Way's outer stellar halo.

  10. VOTable JAVA Streaming Writer and Applications.

    NASA Astrophysics Data System (ADS)

    Kulkarni, P.; Kembhavi, A.; Kale, S.

    2004-07-01

    Virtual Observatory related tools use a new standard for data transfer called the VOTable format. This is a variant of the xml format that enables easy transfer of data over the web. We describe a streaming interface that can bridge the VOTable format, through a user friendly graphical interface, with the FITS and ASCII formats, which are commonly used by astronomers. A streaming interface is important for efficient use of memory because of the large size of catalogues. The tools are developed in JAVA to provide a platform independent interface. We have also developed a stand-alone version that can be used to convert data stored in ASCII or FITS format on a local machine. The Streaming writer is successfully being used in VOPlot (See Kale et al 2004 for a description of VOPlot).We present the test results of converting huge FITS and ASCII data into the VOTable format on machines that have only limited memory.

  11. Cytoplasmic Streaming - Skylab Student Experiment ED-63

    NASA Technical Reports Server (NTRS)

    1973-01-01

    This chart describes the Skylab student experiment (ED-63), Cytoplasmic Streaming, proposed by Cheryl A. Peitz of Arapahoe High School, Littleton, Colorado. Experiment ED-63 was to observe the effect of zero-gravity on cytoplasmic streaming in the aquatic plant named Elodea, commonly called water weed or water thyme. The phenomenon of cytoplasmic streaming is not well understood, but it is recognized as the circulation mechanism of the internal materials or cytoplasm of a cell. Cytoplasm is a gelatinous substance that has the ability to change its viscosity and flow, carrying various cell materials with it. The activity can be stimulated by sunlight or heat. In March 1972, NASA and the National Science Teachers Association selected 25 experiment proposals for flight on Skylab. Science advisors from the Marshall Space Flight Center aided and assisted the students in developing the proposals for flight on Skylab.

  12. Observations of ion streaming during substorms

    NASA Technical Reports Server (NTRS)

    Lui, A. T. Y.; Williams, D. J.; Eastman, T. E.; Frank, L. A.

    1983-01-01

    The ion beam phenomenon at the plasma sheet boundary is examined for individually identifiable substorms, and the substorm-associated particle phenomena are evaluated in terms of the energy-angle distributions of the plasma population and three-dimensional energetic ion distributions. In all seven cases studied it is found that ion beams streaming earthward and/or tailward are always present at the edge of the plasma sheet adjacent to the tail lobe. Ion beams penetrating into the plasma sheet region with no detectable density gradient are also observed. Beams at tens to hundreds of eV often stream tailward and are often long lasting, suggesting that they may be related to ionospheric sources. Both tailward and earthward streaming beams are detected for ion beams above 1 keV, consistent with an origin from the distant tail, propagation toward earth, and mirroring back under single particle motions.

  13. Identifying hidden voice and video streams

    NASA Astrophysics Data System (ADS)

    Fan, Jieyan; Wu, Dapeng; Nucci, Antonio; Keralapura, Ram; Gao, Lixin

    2009-04-01

    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%.

  14. Beaded streams of Arctic permafrost landscapes

    NASA Astrophysics Data System (ADS)

    Arp, C. D.; Whitman, M. S.; Jones, B. M.; Grosse, G.; Gaglioti, B. V.; Heim, K. C.

    2014-07-01

    Beaded streams are widespread in permafrost regions and are considered a common thermokarst landform. However, little is known about their distribution, how and under what conditions they form, and how their intriguing morphology translates to ecosystem functions and habitat. Here we report on a Circum-Arctic inventory of beaded streams and a watershed-scale analysis in northern Alaska using remote sensing and field studies. We mapped over 400 channel networks with beaded morphology throughout the continuous permafrost zone of northern Alaska, Canada, and Russia and found the highest abundance associated with medium- to high-ice content permafrost in moderately sloping terrain. In the Fish Creek watershed, beaded streams accounted for half of the drainage density, occurring primarily as low-order channels initiating from lakes and drained lake basins. Beaded streams predictably transition to alluvial channels with increasing drainage area and decreasing channel slope, although this transition is modified by local controls on water and sediment delivery. Comparison of one beaded channel using repeat photography between 1948 and 2013 indicate relatively stable form and 14C dating of basal sediments suggest channel formation may be as early as the Pleistocene-Holocene transition. Contemporary processes, such as deep snow accumulation in stream gulches effectively insulates river ice and allows for perennial liquid water below most beaded stream pools. Because of this, mean annual temperatures in pool beds are greater than 2 C, leading to the development of perennial thaw bulbs or taliks underlying these thermokarst features. In the summer, some pools stratify thermally, which reduces permafrost thaw and maintains coldwater habitats. Snowmelt generated peak-flows decrease rapidly by two or more orders of magnitude to summer low flows with slow reach-scale velocity distributions ranging from 0.1 to 0.01 m s-1, yet channel runs still move water rapidly between pools. This repeating spatial pattern associated with beaded stream morphology and hydrological dynamics may provide abundant and optimal foraging habitat for fish. Thus, beaded streams may create important ecosystem functions and habitat in many permafrost landscapes and their distribution and dynamics are only beginning to be recognized in Arctic research.

  15. Are cosmological neutrinos free-streaming?

    SciTech Connect

    Basboell, Anders; Bjaelde, Ole Eggers; Hannestad, Steen; Raffelt, Georg G.

    2009-02-15

    Precision data from cosmology suggest neutrinos stream freely and hence interact very weakly around the epoch of recombination. We study this issue in a simple framework where neutrinos recouple instantaneously and stop streaming freely at a redshift z{sub i}. The latest cosmological data imply z{sub i} < or approx. 1500, the exact constraint depending somewhat on the assumed prior on z{sub i}. This bound can be translated into a bound on the coupling strength between neutrinos and majoronlike particles.

  16. Investigating methods of stream planform identification

    NASA Astrophysics Data System (ADS)

    Lohberg, M. M.; Lusk, K.; Miller, D.; Stonedahl, F.; Stonedahl, S. H.

    2013-12-01

    Stream planforms are used to map scientific measurements, estimate volumetric discharge, and model stream flow. Changes in these planforms can be used to quantify erosion and water level fluctuations. This research investigated five cost-effective methods of identifying stream planforms: (1) consumer-grade digital camera GPS (2) multi-view stereo 3D scene reconstruction (using Microsoft Photosynth (TM)) (3) a cross-sectional measurement approach (4) a triangulation-based measurement approach and (5) the 'square method' - a novel photogrammetric procedure which involved floating a large wooden square in the stream, photographing the square and banks from numerous angles and then using the square to correct for perspective and extract the outline (using custom post-processing software). Data for each of the five methods was collected at Blackhawk Creek in Davenport, Iowa. Additionally we placed 30 control points near the banks of the stream and measured 88 lengths between these control points. We measured or calculated the locations of these control points with each of our five methods and calculated the average percent error associated with each method using the predicted control point locations. The effectiveness of each method was evaluated in terms of accuracy, affordability, environmental intrusiveness, and ease of use. The camera equipped with GPS proved to be a very ineffective method due to an extremely high level of error, 289%. The 3D point cloud extracted from Photosynth was missing markers for many of the control points, so the error calculation (which yielded 11.7%) could only be based on five of the 88 lengths and is thus highly uncertain. The two non-camera methods (cross-sectional and triangulation measurements) resulted in low percent error (2.04% and 1.31% respectively) relative to the control point lengths, but these methods were very time consuming, exhausting, and only provided low resolution outlines. High resolution data collection would require even smaller increments, drastically increasing field work time. These two non-photo methods also disturb the sediments in the stream, which may be undesirable. Finally, the 'square method' provided a high resolution outline with only a 1.51% error and was relatively easy to complete in the field. It did, however, require a great-deal of manual post-processing time. Despite this caveat, we recommend the square method as an inexpensive procedure for obtaining fine resolution planform data with minimal disturbance to the stream environment. Stream planforms and calculated control point locations with respective average percent errors

  17. Sulfur dioxide removal from gas streams

    SciTech Connect

    Urban, P.; Ginger, E.A.

    1986-11-11

    A process is described for removal of sulfur dioxide pollutant gas from gas stream which comprises contacting the gas stream with pretreated shale in the form of an aqueous solution of aluminum sulfate including from about 0.1 to about 2.0% by weight of the pretreated shale. The pretreatment of the shale comprises the heating of the shale in the presence of a gas unable to support combustion at a temperature in a range of from about 340/sup 0/C. to about 480/sup 0/C.

  18. Detection and Identification of Free-living Amoeba from Environmental Water in Taiwan by PCR Method

    NASA Astrophysics Data System (ADS)

    Tsai, H. F.; Hsu, B. M.; Huang, K. H.; She, C. Y.; Kao, P. M.; Shen, S. M.; Tseng, S. F.; Chen, J. S.

    2012-04-01

    Acanthamoeba, Naegleria, Balamuthia and Hartmannella all belong to free-living amoebae that are present ubiquitously in the environment including water, soil, and air. Free-living amoebae are parasites which can infect humans and can lead to serious illness and even death. The aim of this study is to investigate the presence of free-living amoebae in aquatic environment in Taiwan, and to compare the differences between Acanthamoeba and Naegleria in diverse cultivation methods and conditions. In this study, we used molecular method by PCR amplification with specific primers to analyze the occurrence of free-living amoebae. We collected 176 samples from environmental water including drinking water treatment plants, stream water, and hot spring recreational areas in Taiwan. Based on the results of PCR, 43 water samples (24.4%) were detected positive for free-living amoebae. The most common Acanthamoeba genotype isolated from samples including T2, T4, T5, T12, and T15. N. australiensis and N. lovaniensis were also identified by molecular biology techniques. Furthermore, we found that both Acanthamoeba and Naegleria can be cultured by PYG in 30 C, but not all free-living amoebae can be isolated and enriched by using storage-cultivation method. Because of the widespread presence of Acanthamoeba and Naegleria in aquatic environments, the water quality and safety of aquatic environments should be more conscious in Taiwan and worldwide. Keywords: free-living amoebae; Acanthamoeba; Naegleria; Balamuthia; Hartmannella; PCR

  19. 40 CFR Table 7 to Subpart Ffff of... - Requirements for Wastewater Streams and Liquid Streams in Open Systems Within an MCPU

    Code of Federal Regulations, 2014 CFR

    2014-07-01

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  20. 40 CFR Table 7 to Subpart Ffff of... - Requirements for Wastewater Streams and Liquid Streams in Open Systems Within an MCPU

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 false Requirements for Wastewater Streams and Liquid Streams in Open Systems...FFFF of Part 63Requirements for Wastewater Streams and Liquid Streams in Open Systems...following table that applies to your wastewater streams and liquid streams in open...