Sample records for itunes live streaming

  1. iTunes

    NSDL National Science Digital Library

    Since its initial release, iTunes has become a popular favorite with Mac users. Recently, Apple released this free version of iTunes for Windows. For those who haven't tried iTunes yet, the program functions as a digital-jukebox, and includes the ability to listen to over 250 free Internet radio stations and the ability to burn custom playlists to CDs and MP3 CDs as well. Other novel features include iMix, which lets users post and email songs in their playlists for the consideration of others. This version of iTunes is compatible with those systems running Windows 2000 or XP.

  2. iTunes Remote Control

    NSDL National Science Digital Library

    Houston, James

    2006-01-01

    As of late, there are dozens of programs that allow users to customize the iTunes program in a number of compelling ways. Some of them are fairly straight-forward, such as this version of iTunes Remote Control. As its name implies, the application gives users the ability to control iTunes on a remote machine, along with basic playlist support. This version is compatible with computers running Max OS X 10.4 and newer.

  3. High Bandwidth Live Media Stream Replication

    Microsoft Academic Search

    Aniruddha Bohra; Samrat Ganguly; Akhilesh Saxena; Rauf Izmailov

    Meeting the ever increasing need for streaming high bandwidth live media to users, we present Rainbow Streaming Network. Rainbow is a system for replicating high bandwidth stream to edge servers in a content distribution network in real-time. In Rainbow, live media is distributed using multiple overlay multicast trees to extract higher bandwidth from the underlying network leveraging the benefit of

  4. Dynamic adaptive HTTP streaming of live content

    Microsoft Academic Search

    Thorsten Lohmar; Torbjorn Einarsson; Per Frojdh; Frederic Gabin; Markus Kampmann

    2011-01-01

    MPEG has recently released a first public draft of the new Dynamic Adaptive Streaming over HTTP (DASH) specification. The new streaming technique is based on the 3GPP and partly also on the Open IPTV Forum (OIPF) specifications. In this paper, we give an overview about the new DASH specification with a special focus on Live streaming services. In order to

  5. SALSA: Super-Peer Assisted Live Streaming Architecture

    E-print Network

    Bahk, Saewoong

    SALSA: Super-Peer Assisted Live Streaming Architecture Jongtack Kim School of EECS, INMC Seoul streaming system, called super-peer assisted live streaming architecture (SALSA). In SALSA, super-peers assisted live streaming architecture (SALSA). In SALSA, super-peers with high upload bandwidth convey

  6. 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…

  7. Multipath Live Streaming via TCP: Performance and Benefits

    Microsoft Academic Search

    Bing Wang; Wei Wei; Zheng Guo; Don Towsley

    Abstract Recently, a number of studies have demonstrated that multipath streaming is a promising technique to overcome the challenges of multimedia,streaming over the best-effort Internet. These studies all focus on UDP-based streaming. Motivated by the wide use of TCP for streaming in practice and our earlier results on single-path TCP streaming, we study multipath live streaming via TCP in this

  8. Multipath Live Streaming via TCP: Performance and Benefits

    Microsoft Academic Search

    Bing Wang; Wei Weiy; Zheng Guo; Don Towsleyy

    Recently, a number of studies have demonstrated that multipath streaming is a promising technique to overcome the challenges of multimedia streaming over the best-effort Internet. These studies all focus on UDP-based streaming. Motivated by the wide use of TCP for streaming in practice and our earlier results on single-path TCP streaming, we study multipath live streaming via TCP in this

  9. iTunes 4.0

    NSDL National Science Digital Library

    This latest version of iTunes will be a welcome addition to Mac users, as it allows individuals to create their own personal music library. Perhaps the most notable feature of this version is that users can now instantly buy and download music from the vast collection contained within the iTunes Music Store. Within the store, users can download free previews, view album cover art, and examine a list of new releases and staff favorites. iTunes 4.0 is compatible with all systems running Mac OS X.

  10. Multipath live streaming via TCP: scheme, performance and benefits

    Microsoft Academic Search

    Bing Wang; Wei Wei; Zheng Guo; Donald F. Towsley

    2007-01-01

    Motivated by the wide use of TCP for streaming in prac- tice and the increasing availability of multipath between end hosts, we study multipath live streaming via TCP in this pa- per. We first design a simple and practical TCP-based multi- path streaming scheme, namedDynamic MPath-streaming (DMP-streaming), which dynamically distributes packets over multiple paths by implicitly inferring the available bandwidths

  11. An evaluation of live adaptive HTTP segment streaming request strategies

    Microsoft Academic Search

    Tomas Kupka; Pal Halvorsen; Carsten Griwodz

    2011-01-01

    Nowadays, several live and on-demand streaming solutions use HTTP for signaling and data delivery. A frequently used technique is to chop a continuous stream into segments, encode these in multiple qualities and make these available for download using plain HTTP methods. This approach has become known as dynamic adaptive segment streaming over HTTP. Its advantage is that the deployed web

  12. Adaptive Traffic-Based Techniques For Live Multimedia Streaming

    E-print Network

    Adaptive Traffic-Based Techniques For Live Multimedia Streaming Gabriel-Miro Muntean and LiamMiro.Muntean@ucd.ie, Liam.Murphy@ucd.ie Abstract The growing number of multimedia stream transmissions done through the time-sensitive applications and especially the continuity of multimedia streaming. The paper presents

  13. Feedback control for adaptive live video streaming

    Microsoft Academic Search

    Luca De Cicco; Saverio Mascolo; Vittorio Palmisano

    2011-01-01

    Multimedia content feeds an ever increasing fraction of the Internet traffic. Video streaming is one of the most important applications driving this trend. Adaptive video streaming is a relevant advancement with respect to classic progressive download streaming such as the one employed by YouTube. It consists in dynamically adapting the content bitrate in order to provide the maximum Quality of

  14. Low latency live video streaming using HTTP chunked encoding

    Microsoft Academic Search

    Viswanathan Swaminathan; Sheng Wei

    2011-01-01

    Hypertext transfer protocol (HTTP) based streaming solutions for live video and video on demand (VOD) applications have become available recently. However, the existing HTTP streaming solutions cannot provide a low latency experience due to the fact that inherently in all of them, latency is tied to the duration of the media fragments that are individually requested and obtained over HTTP.

  15. LACES: Live Authoring through Compositing and Editing of Streaming Video

    E-print Network

    LACES: Live Authoring through Compositing and Editing of Streaming Video Dustin Freeman, Stephanie of Toronto {dustin,ssantosa,fanny,ravin,karan}@dgp.toronto.edu ABSTRACT Video authoring activity typically polished or professional video, video clips pro- duced by casual video makers as seen in online forums

  16. A hierarchical characterization of a live streaming media workload

    Microsoft Academic Search

    Eveline Veloso; Virgílio Almeida; Wagner Meira Jr.; Azer Bestavros; Shudong Jin

    2006-01-01

    We present a thorough characterization of what we believe to be the first significant live Internet streaming media workload in the scientific literature. Our characterization of over 3.5 million requests spanning a 28-day period is done at three increasingly granular levels, corresponding to clients, sessions, and transfers. Our findings support two important conclusions. First, we show that the nature of

  17. A hierarchical characterization of a live streaming media workload

    Microsoft Academic Search

    Eveline Veloso; Virgílio A. F. Almeida; Wagner Meira Jr.; Azer Bestavros; Shudong Jin

    2006-01-01

    We present a thorough characterization of what we believe to be the first significant live Internet streaming media workload in the scientific literature. Our characterization of over 3.5 million requests spanning a 28-day period is done at three in- creasingly granular levels, corresponding to clients, sessions, and transfers. Our findings support two important conclusions. First, we show that the nature

  18. Apple Education iTunes U User's Guide

    E-print Network

    Li, Teng

    Apple Education iTunes U User's Guide December 11, 2006 #12; Apple Computer, Inc. © 2006 Apple Computer, Inc. All rights reserved. Apple, the Apple logo, iPod, iTunes, and Mac are trademarks of Apple Computer, Inc., registered in the U.S. and other countries. Safari is a trademark of Apple Computer, Inc. i

  19. Apple Education iTunes U User's Guide

    E-print Network

    Bieber, Michael

    Apple Education iTunes U User's Guide September 4, 2007 #12; Apple Inc. © 2007 Apple Inc. All rights reserved. Apple, the Apple logo, iPod, iTunes, Mac, and QuickTime are trademarks of Apple Inc., registered in the U.S. and other countries. Apple TV, iPhone, and Safari are trademarks of Apple Inc. i

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

    E-print Network

    Kleinberg, Robert D.

    PROCEEDINGS OF THE IEEE 1 A Transport Layer for Live Streaming in a Content Delivery Network the author was with Akamai Technologies. higher pressure on caches. Furthermore, live streaming does not lend of streaming than it is in the context of HTTP content delivery. This is due to the fact that stream startup

  1. CoolStreaming\\/DONet: A Data-Driven Overlay Network for Efficient Live Media Streaming

    Microsoft Academic Search

    Xinyan Zhang; Bo Liz; Tak-Shing Peter Yum

    2005-01-01

    This paper presents DONet, a Data-driven Overlay Network for live media streaming. The core operations in DONet are very simple: every node peri- odically exchanges data availability information with a set of partners, and retrieves unavailable data from one or more partners, or supplies available data to partners. We emphasize three salient features of this data-driven design: 1) easy to

  2. Magellan: Charting Large-Scale Peer-to-Peer Live Streaming Topologies

    Microsoft Academic Search

    Chuan Wu; Baochun Li; Shuqiao Zhao

    2007-01-01

    Live peer-to-peer (P2P) streaming applications have been successfully deployed in the Internet. With relatively simple peer selection protocol design, modern live P2P streaming applications are able to provide millions of con- current users adequately satisfying viewing experiences. That said, few existing research has provided sufficient in- sights on the time-varying internal characteristics of P2P topologies in live streaming. With 120

  3. Streams

    NSDL National Science Digital Library

    This site is part of the Gulf of Maine Aquarium, and focuses on stream environments in Maine. Topics include: Maine's Water Roots, which looks at the human history of Maine as it can be traced along its waterways; What is a Stream?; Life in the Mainstream, Living on the Edge; A Role for Everyone, and Bibliography. Concepts addressed include water quality, watersheds, the hydrologic cycle, aquatic stages, and stream ecology.

  4. CodePlay: Live Multimedia Streaming in VANETs using Symbol-Level Network Coding

    E-print Network

    Li, Ming

    1 CodePlay: Live Multimedia Streaming in VANETs using Symbol-Level Network Coding Zhenyu Yang challenges of providing live mul- timedia streaming (LMS) services in vehicular ad hoc net- works (VANETs while using minimal bandwidth resources, especially under the highly dynamic topology of VANETs

  5. CoreCast: Efficient Live Streaming in the Core-Edge Separated Internet

    E-print Network

    Politècnica de Catalunya, Universitat

    The increasing bandwidth offered by home broadband connections makes delivering live streaming and IPTV content. 1. INTRODUCTION In today's IPTV and live streaming landscape we see two major directions. On one to their customers in triple-play packages consisting of IPTV, IP telephony and Internet access. On the other hand we

  6. A performance evaluation of scalable live video streaming with nano data centers

    E-print Network

    Chaintreau, Augustin

    : Available online 25 October 2008 Keywords: Nano data centers Live video streaming Peer-to-peer technologyA performance evaluation of scalable live video streaming with nano data centers Jiayue He here nano data centers, which contrast with the churn and resource heterogeneity of peers

  7. Lava: A Reality Check of Network Coding in Peer-to-Peer Live Streaming

    E-print Network

    Li, Baochun

    1 Lava: A Reality Check of Network Coding in Peer-to-Peer Live Streaming Mea Wang, Baochun Li are progressively received. We then implement a realistic testbed, called Lava, with actual network traffic

  8. Quality-adaptive scheduling for live streaming over multiple access networks

    Microsoft Academic Search

    Kristian Evensen; Tomas Kupka; Dominik Kaspar; Pål Halvorsen; Carsten Griwodz

    2010-01-01

    Video streaming ranks among the most popular services offered through the Internet today. At the same time, accessing the Internet over public WiFi and 3G networks has become part of our everyday lives. However, streaming video in wireless environments is often subject to frequent periods of rebuffering and characterized by low picture quality. In particular, achieving smooth and quality-adaptive streaming

  9. A Scalable Mobile Live Video Streaming System Based on RTMP and HTTP Transmissions

    Microsoft Academic Search

    Qian Chang; Zehong Yang; Yixu Song

    \\u000a In this paper we introduce a scalable 3G live streaming system. It has a mobile client which captures and publishes video\\u000a streams to a media server. Then the server broadcasts and archives received streams simultaneously. Our system uses flash\\u000a technology in the end-user development and thus we get very wide device support. By applying self-adaptive HTTP and RTMP transmissions,\\u000a our

  10. A Live-Bucket for Use in Surveys of Small Streams

    Microsoft Academic Search

    Daniel J. Isaak; Wayne A. Hubert

    1997-01-01

    Conventional equipment and methods used to hold fish during surveys of small streams are either cumbersome or cause injury and kill fish. We designed a live-bucket that is spillproof, inexpensive (US$20), easily assembled, keeps fish in good condition, and does not restrict a person's movements. The livebucket was used during electrofishing surveys on 120 stream reaches ranging in water surface

  11. Small-scale dispersal and population structure in stream-living brown trout (Salmo trutta) inferred

    E-print Network

    Bernatchez, Louis

    Small-scale dispersal and population structure in stream-living brown trout (Salmo trutta) inferred-scale location change of resident brown trout (Salmo trutta) in a small stream (1500 m). During the first summer pour étudier l'importance des changements d'emplacement à petite échelle de la truite de mer (Salmo

  12. Should only live diatoms be used in the bioassessment of small mountain streams?

    Microsoft Academic Search

    Nadezhda Gillett; Yangdong Pan; Christian Parker

    2009-01-01

    It is unclear whether differentiating live and dead diatoms would enhance the accuracy and precision of diatom-based stream\\u000a bioassessment. We collected benthic diatom samples from 25 stream sites in the Northern Oregon Coast ecoregion. We counted\\u000a live diatoms (cells with visible chloroplasts) and then compared the counts with those generated using the conventional method\\u000a (clean counts). Non-metric multidimensional scaling (NMDS)

  13. Syncing Your iPhone with iTunes

    Microsoft Academic Search

    Steve Sande; Erica Sadun

    \\u000a Your iPhone is a media machine at heart. Whether you like watching movies or TV shows, listening to music, or checking in\\u000a on your favorite podcasts, the iPhone is able to supply you with plenty of media in a pocket-sized box. Music and video content\\u000a starts with iTunes. It doesn’t matter whether you bought your songs and video at the

  14. Are populations of mayflies living in adjacent fish and fishless streams genetically differentiated?

    Microsoft Academic Search

    BARBARA L. P ECKARSKY; JANE M. H UGHES; PETER B. M ATHER; MIA H ILLYER

    2005-01-01

    SUMMARY 1. Conspecific populations living in habitats with different risks of predation often show phenotypic variation in defensive traits. Traits of two species of mayflies (Baetidae: Baetis bicaudatus and Baetis sp. nov.) differ between populations living in fish and fishless streams in a high altitude drainage basin in western Colorado, U.S.A. We tested for genetic differentiation between mayfly populations in

  15. Crane Cam: Live Streaming Video of Sandhill Crane Migration

    NSDL National Science Digital Library

    A National Geographic feature, Crane Cam provides multimedia shows, a photo gallery, map, and viewings from a live remote camera at Audubon's Rowe Sanctuary. While the live broadcast has ended, visitors can still access the information about cranes and view highlights from the footage that was captured. Requires Real Player 10.5 plug-in.

  16. StreamSide LiveStock excLuSion: A tool for increasing farm income and improving water quality

    E-print Network

    Liskiewicz, Maciej

    StreamSide LiveStock excLuSion: A tool for increasing farm income and improving water quality by R, and improvements in riparian vegetation and in-stream water quality. Livestock stream exclusion practices and improving water quality 1 There are several reasons why a producer might choose to limit livestock stream

  17. Initial Offset Placement in p2p Live Streaming Systems

    Microsoft Academic Search

    Chunxi Li; Changjia Chen

    2008-01-01

    Initial offset placement in p2p streaming systems is studied in this paper. Proportional placement (PP) scheme is proposed. In this scheme, peer places the initial offset as the offset reported by other reference peer with a shift proportional to the buffer width or offset lag of this reference peer. This will introduce a stable placement that supports larger buffer width

  18. Design and deployment of a hybrid CDN-P2P system for live video streaming: experiences with LiveSky

    Microsoft Academic Search

    Hao Yin; Xuening Liu; Tongyu Zhan; Vyas Sekar; Feng Qiu; Chuang Lin; Hui Zhang; Bo Li

    2009-01-01

    We present our design and deployment experiences with LiveSky, a commercially deployed hybrid CDN-P2P live stream- ing system. CDNs and P2P systems are the common tech- niques used for live streaming, each having its own set of advantages and disadvantages. LiveSky inherits the best of both worlds: the quality control and reliability of a CDN and the inherent scalability of

  19. Deploying P2P networks for large-scale live video-streaming service [Peer-to-Peer Multimedia Streaming

    Microsoft Academic Search

    Y. Tang Yun; J.-G. Luo Jian-Guang; M. Zhang Meng; S.-Q. Yang Shi-Qiang; Q. Zhang Qian

    2007-01-01

    Peer-to-peer (P2P) networks have been adopted for Internet live video-streaming service, and several practical systems have been deployed in past years due to the inherent scalability and ease of deployment. However, most of these systems are commercial and proprietary, and hence little research was done in the area of characterizing practical system performance properties. In this article, we mainly present

  20. The role of live diatoms in bioassessment: a large-scale study of Western US streams

    Microsoft Academic Search

    Nadezhda D. Gillett; Yangdong Pan; Kalina M. Manoylov; R. Jan Stevenson

    2011-01-01

    Diatom-based stream bioassessment is constantly being improved to meet the increasing demands of water quality management.\\u000a This study examined whether percentage of live diatoms (PLD) in periphyton communities can be used as a metric of human disturbance\\u000a in streams and rivers. The analyzed dataset (587 sites) was collected over the course of 3 years (2000–2002) from 12 Western\\u000a US states

  1. Initial Offset Placement in p2p Live Streaming Systems

    E-print Network

    Li, Chunxi

    2008-01-01

    Initial offset placement in p2p streaming systems is studied in this paper. Proportional placement (PP) scheme is proposed. In this scheme, peer places the initial offset as the offset reported by other reference peer with a shift proportional to the buffer width or offset lag of this reference peer. This will introduce a stable placement that supports larger buffer width for peers and small buffer width for tracker. Real deployed placement method in PPLive is studied through measurement. It shows that, instead of based on offset lag, the placement is based on buffer width of the reference peer to facilitate the initial chunk fetching. We will prove that, such a PP scheme may not be stable under arbitrary buffer occupation in the reference peer. The required average buffer width then is derived. A simple good peer selection mechanism to check the buffer occupation of reference peer is proposed for a stable PP scheme based on buffer width

  2. 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

  3. Who Wants To Live Here? Water Sampling At Our Local Pond and Stream

    NSDL National Science Digital Library

    Susan Van Kekerix

    This activity is a field activity where students will perform various water quality tests to determine the types of organisms that live in a local pond and stream, and the characteristics that those aquatic environments seem to have that the organisms favor.

  4. CodePlay: Live Multimedia Streaming In VANETs using Symbol-Level Network Coding

    E-print Network

    Hou, Y. Thomas

    CodePlay: Live Multimedia Streaming In VANETs using Symbol-Level Network Coding Zhenyu Yang, Ming hoc networks (VANETs) for their capa bility of providing comprehensive and user-friendly information of VANETs and the lossy nature of vehicular wireless communications. A recent technique, symbol

  5. On Minimizing Average End-to-End Delay in P2P Live Streaming Systems

    E-print Network

    Ravindran, Binoy

    streaming applications have exhibited grow- ing popularity, such as IPTV, VOIP, and video conferencing deployment of P2P systems. For example, IPTV deployment from commercial service providers is far below downloading capacities on peers, but also allows IPTV service providers to deliver live content at diverse

  6. Stochastic Analysis of A Randomized Detection Algorithm for Pollution Attack in P2P Live Streaming

    E-print Network

    Lui, John C.S.

    Stochastic Analysis of A Randomized Detection Algorithm for Pollution Attack in P2P Live Streaming Systems Yongkun Li John C.S. Lui The Chinese University of Hong Kong Abstract Pollution attack is known- width. We propose a distributed defense and detection mechanism to resolve pollution attacks

  7. Deployment of Live-Video Services Based on Streaming Technology over an HFC Network

    Microsoft Academic Search

    David Melendi; Xabiel G. Pañeda; Roberto García; Ricardo Bonis; Víctor G. García

    2004-01-01

    1 Abstract: This paper presents an approach to the deployment of a live-video service based on streaming technology over an HFC network. This approach covers most of the issues that may arise while putting one of these services into operation, taking into account new aspects such as those oriented to the improvement and prior analysis of the service's behaviour. An

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

    Microsoft Academic Search

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

    This paper describes our experiences building a coherent framework for ef- ficient simultaneous querying of live and archived stream data. This work was motivated by the need to analyze the network traffic patterns of research labora- tories funded by the U.S. Department of Energy. We review the requirements of such a system and implement a prototype based on the TelegraphCQ

  9. Performance Bounds for Peer-Assisted Live Streaming Shao Liu, Rui Zhang-Shen, Wenjie Jiang, Jennifer Rexford, Mung Chiang

    E-print Network

    Chiang, Mung

    , we argue that service providers can deploy a peer- assisted streaming architecture to offer high-assisted streaming architecture combines the best fea- tures of server-based and peer-based solutions. In an emergingPerformance Bounds for Peer-Assisted Live Streaming Shao Liu, Rui Zhang-Shen, Wenjie Jiang

  10. 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.

  11. A peer-to-peer architecture for efficient live scalable media streaming on internet

    Microsoft Academic Search

    Xuguang Lan; Nanning Zheng; Jianru Xue; Xiaoguang Wu; Bin Gao

    2007-01-01

    This paper presents a manageable overlay network architecture SVCP2P for live scalable media streaming. Every peer in SVCP2P periodically exchanges data availability information with one of distributed central servers which act as the centralized index for storing peer list, program list and buffer information of peers. An efficient scheduling algorithm is proposed, which achieves real-time and continuous transmission of the

  12. A performance evaluation of scalable live video streaming with nano data centers

    Microsoft Academic Search

    Jiayue He; Augustin Chaintreau; Christophe Diot

    2009-01-01

    To improve the efficiency and the quality of a service, a network operator may consider deploying a peer-to-peer architecture among controlled peers, also called here nano data centers, which contrast with the churn and resource heterogeneity of peers in uncontrolled environments. In this paper, we consider a prevalent peer-to-peer application: live video streaming. We demonstrate how nano data centers can

  13. A Novel Distributed and Practical Incentive Mechanism for Peer to Peer Live Video Streaming

    Microsoft Academic Search

    Yun Tang; Lifeng Sun; Meng Zhang; Shiqiang Yang; Yuzhuo Zhong

    2006-01-01

    The successful deployment of peer-to-peer (P2P) live video streaming systems has practically demonstrated that it can scale to reliably support a large population of peers. How- ever, peers, representing rational end users, tend to be non- cooperative when it comes to the duty rather than the self- interests, running counter to the fundamental design philos- ophy of P2P concept. The

  14. Towards an Incentive Mechanism for Peer-to-Peer Multimedia Live Streaming Systems

    Microsoft Academic Search

    Thomas Silverston; Olivier Fourmaux; Jon Crowcroft

    2008-01-01

    Incentive mechanisms are essential components of peer-to- peer systems for file sharing such as BitTorrent, since they enforce peers to share their resources and to participate. Recent P2P systems that distribute live multimedia streams take their inspiration from BitTorrent, but have not defined incentive mechanisms appropriate to the nature of contin- uous media. In this article, we uncover the way

  15. TOW:A novel time and popularity sensitive cache algorithm for P2P live media streaming

    Microsoft Academic Search

    Maozhi Hu; Ke Xu; Shu-tao Xia; Mingjiang Ye

    2008-01-01

    P2P applications are widely used and make tremendous traffic in today's network. With the increasing number of IPTV users, it is reasonable to foresee that P2P live media streaming media will account for a considerable proportion in future backbone traffic. Few works focus on the P2P live media streaming cache in the view of ISP and directly compare its performance

  16. Occurrence of free-living amoebae in streams of the Mexico Basin.

    PubMed

    Bonilla-Lemus, Patricia; Caballero Villegas, Adán S; Carmona Jiménez, Javier; Lugo Vázquez, Alfonso

    2014-11-01

    Free-living amoebae (FLA) are protozoa that are widely distributed in nature. They are important in the cycling of nutrients in aquatic food chains, but their distribution in natural aquatic environments is not well known. We conducted a survey to determine the presence and distribution of FLA and their relation to some physicochemical parameters in streams of the Mexico Basin in Central Mexico. Thirty-two sites from 18 streams were sampled. Samples were centrifuged and cultured onto NNA-media to isolate amoebae. Identifications were based on morphology. The pathogenicity of Acanthamoeba isolates was tested. Oxygen saturation, temperature, pH, specific conductance, water flow, dissolved reactive phosphorus, nitrites, nitrates, ammonia, dissolved inorganic nitrogen and coliforms were determined. One hundred-and-twenty FLA representing 18 genera were identified. The most frequent genera were Vannella, Rosculus and Acanthamoeba. The frequency of potentially pathogenic FLA was low and only 3 Acanthamoeba isolates were invasive in mice. The highest species richness of FLA was found in streams located into agriculture activity areas and those close to small villages that discharge wastewater into them. Water temperatures were always below 17°C. Oxygen saturation and pH were within the limits for the growth of most FLA. The presence of Acanthamoeba and Naegleria was low; nevertheless, they include potentially pathogenic species and can act as vectors and reservoirs for microbial pathogens and can produce human infections. PMID:25014111

  17. Analysis of adaptive streaming for hybrid CDN\\/P2P live video systems

    Microsoft Academic Search

    Ahmed Mansy; Mostafa Ammar

    2011-01-01

    Most commercial video streaming systems rely on Content Distribution Networks (CDNs) to distribute video content. HTTP adaptive streaming has been recently adopted by major video streaming providers and is now considered the standard technique used with CDN-based streaming systems. Despite the success of these systems, cost-effective scalability continues to be of concern in their design and deployment. To address this,

  18. A transport layer for live streaming in a content delivery network

    Microsoft Academic Search

    LEONIDAS KONTOTHANASSIS; RAMESH SITARAMAN; JOEL WEIN; DUKE HONG; ROBERT KLEINBERG; BRIAN MANCUSO; DAVID SHAW; DANIEL STODOLSKY

    2004-01-01

    Streaming media on the Internet has experienced rapid growth over the last few years and will continue to increase in importance as broadband technologies and authoring tools continue to improve. As the Internet becomes an increasingly popular alternative to traditional communications media, Internet streaming will become a significant component of many content providers' communications strategies. Internet streaming, however, poses significant

  19. A Transport Layer for Live Streaming in a Content Delivery Network

    Microsoft Academic Search

    Leonidas Kontothanassis; Joel Wein; Robert Kleinbergzx

    Streaming media on the internet has experienced rapid growth over the last few years and will continue to increase in importance as broadband technologies and authoring tools continue to improve. As the internet becomes an increasingly popular alternative to traditional communications media, internet streaming will become a significant component of many content providers' communications strategy. Internet streaming, however, poses significant

  20. Are populations of mayflies living in adjacent fish and fishless streams genetically differentiated?

    E-print Network

    McIntosh, Angus

    . Traits of two species of mayflies (Baetidae: Baetis bicaudatus and Baetis sp. nov.) differ between streams have the genetic capability to respond to fish. 3. During summer 2001 we collected Baetis larvae variation of Baetis individuals within and among streams. 4. Results showed that genetic variation exists

  1. Towards building large scale live media streaming framework for a U-city

    Microsoft Academic Search

    Eun-seok Ryu; Chuck Yoo

    2008-01-01

    This paper proposes camera and media stream management techniques at the middleware level for implementing a U-City (ubiquitous\\u000a city). The study focuses on overcoming the difficulties associated with developing middleware capable of processing and streaming\\u000a multimedia data from a large number of cameras by expanding the traditional media processing technology. The content of the\\u000a study can be classified into two

  2. Does living in streams with fish involve a cost of induced morphological defences?

    Microsoft Academic Search

    Jonas Dahl; Barbara L. Peckarsky

    2003-01-01

    Previous studies have shown that chemical cues from brook trout (Salvelinus fontinalis) induce relatively longer caudal filaments and heavier exoskeletons in the mayfly Drunella coloradensis. These characters constitute mor- phological defences that reduce larval mortality from brook trout predation. There is also a potential fitness cost of liv - ing in streams with trout, as D. coloradensis females emerge at

  3. Rate-distortion optimized bitstream switching for peer-to-peer live streaming

    Microsoft Academic Search

    Jin-feng Zhang; Rong-gang Wang; Jian-wei Niu; Yuan Dong; Hai-la Wang

    2008-01-01

    Peer-to-peer (P2P) technology provides a cost-effective and scalable way to distribute video data. However, high heterogeneity\\u000a of the P2P network, which rises not only from heterogeneous link capacity between peers but also from dynamic variation of\\u000a available bandwidth, brings forward great challenge to video streaming. To attack this problem, an adaptive scheme based on\\u000a rate-distortion optimization (RDO) is proposed in

  4. On mobile clients as free riders in peer-to-peer live streaming

    Microsoft Academic Search

    Wei-Chih Ting; Pin-Chuan Liu; Shu-Hsin Chang; Jui-Wen Chen

    2011-01-01

    Mobile devices today such as netbooks, tablet PCs and smart phones provide user-friendly interfaces for people to capture live video. However as a viewer, they prefer not to share downloaded clips due to the limited computing power, upload bandwidth and mostly due to the high power consumption while scheduling segments. In this paper, we discuss the possibility of allowing mobile

  5. Wireless live streaming video of surgical operations: an evaluation of communication quality.

    PubMed

    Schneider, Armin; Wilhelm, Dirk; Doll, Dietrich; Rauschenbach, Uwe; Finkenzeller, Michael; Wirnhier, Helga; Illgner, Klaus; Feussner, Hubertus

    2007-01-01

    We evaluated a mobile video system for surgical teleconsultation. A video streaming server in the operating room transmitted video and audio to a hand-held computer (personal digital assistant [PDA]) over a wireless local area network. Two groups of 20 surgeons (each with 12 qualified surgeons and eight surgeons between the 2nd and the 4th year of training) participated in the tests. For voice transmission, correct understanding of numbers was achieved in 100% of the cases (n = 1000) and 98% of medical terms (n = 400). The quality of the video displayed on the PDA was assessed by the recognition of different operating room scenarios. Only 62% (SD 17) of the structures were identified clearly on the hand-held device (n = 400). The accuracy improved to 78% (SD 15) (n = 400) if the same scenario was observed on a larger (50 cm) video screen (p < 0.001). Accuracy was significantly better if audio conversation was possible. The quality evaluation by the consultants showed that the PDA display size and quality were sufficient for clinical use. PMID:18078549

  6. Sync iPhone contacts with Google contacts (for Windows) Using iTunes, sync the iPhone contacts with Outlook.

    E-print Network

    Aalberts, Daniel P.

    to turn off iCloud syncing first a. On the iPhone open Settings. b. Select iCloud. Turn off ContactsSync iPhone contacts with Google contacts (for Windows) Using iTunes, sync the iPhone contacts with Outlook. 1. Plug your iPhone or iPad into your Windows computer. iTunes should open automatically. 2

  7. 3006 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 11, NO. 8, AUGUST 2012 CodePlay: Live Multimedia Streaming in VANETs

    E-print Network

    Hou, Y. Thomas

    Multimedia Streaming in VANETs Using Symbol-Level Network Coding Zhenyu Yang, Member, IEEE, Ming Li, Member- timedia streaming (LMS) services in vehicular ad hoc net- works (VANETs) come from achieving stable resources, especially under the highly dynamic topology of VANETs and the lossy nature of vehicular wireless

  8. AngelCast: Cloud-based Peer-Assisted Live Streaming Using Optimized Multi-Tree Construction

    E-print Network

    for today's content providers (CPs) such as Netflix, Hulu, or IPTV, compared to the chal- lenges associated, Netflix reported last year that it is delivering streams at rates between 1.4Mbps and 2.8Mbps [8

  9. END USER LICENCE AGREEMENT iTUNES STORE, APPLE APP STORE AND iBOOKSTORE ("APPLE iSTORE") DOWNLOADS OF THE JAMES COOK UNIVERSITY MOBILE APP

    E-print Network

    1 END USER LICENCE AGREEMENT ­ iTUNES STORE, APPLE APP STORE AND iBOOKSTORE ("APPLE i and JCU only. Apple Inc. is not a party to this Agreement. JCU, and not Apple Inc., is solely responsible or control that runs the iOS operating system software provided by Apple Inc. ("Device"); (b) for Your own

  10. StreamWorks: the live and on-demand audio/video server and its applications in medical information systems

    NASA Astrophysics Data System (ADS)

    Akrout, Nabil M.; Gordon, Howard; Palisson, Patrice M.; Prost, Remy; Goutte, Robert

    1996-05-01

    Facing a world undergoing fundamental and rapid change, healthcare organizations are seeking ways to increase innovation, quality, productivity, and patient value, keys to more effective care. Individual clinics acting alone can respond in only a limited way, so re- engineering the process key which services are delivered demands real-time collaborative technology that provides immediate information sharing, improving the management and coordination of information in cross-functional teams. StreamWorks is a development stage architecture that uses a distribution technique to deliver an advanced information management system for telemedicine. The challenge of StreamWorks in telemedicine is to enable equity of the quality of Health Care of Telecommunications and Information Technology also to patients in less favored regions, like India or China, where the quality of medical care varies greatly by region, but where there are some very current communications facilities.

  11. iPhone social networking for evidence investigations using iTunes forensics

    Microsoft Academic Search

    Yu-Cheng Tso; Shiuh-Jeng Wang; Cheng-Ta Huang; Wei-Jen Wang

    2012-01-01

    The smart phone, like a small computer, providing not only the functions of normal phones and wireless Internet access, but also all kinds of application tools, serves as a platform of the sources of real-time information, information sharing and information exchange in our daily lives. As a result, the extract the crucial digital evidence in the smart phone, it has

  12. Multimedia Streaming via TCP: An Analytic Performance Study

    E-print Network

    Massachusetts at Amherst, University of

    investigate the performance of TCP for both live and stored media streaming. We validate the models via ns-demand and live stream- ing traffic, respectively, used TCP. Moreover, 27% and 47% of the on-demand and live streaming traffic, respectively, used HTTP. The wide use of HTTP streaming is particularly inter- esting

  13. Revised: 6.25.2012 Bb 9: Creating Podcasts & Subscribing in iTunes p. 1 of 6 This document contains step-by-step instructions for using Wimba Podcaster in Blackboard.

    E-print Network

    Qiu, Weigang

    step-by-step instructions for using Wimba Podcaster in Blackboard. Specifically, it guides you, we mean subscribing to a podcast in Blackboard using the iTunes software program. When we refer to "i Blackboard home page. Go to the Help tab at the top, then click on the Help link below that, and finally

  14. Stream Restoration

    NSDL National Science Digital Library

    2010-12-02

    This video explores how Bernheim Arboretum and Research Forest near Louisville, Kentucky has restored a channelized or straightened stream to its original meandering path, thereby improving the stream’s water quality and creating a better habitat for wildlife.

  15. NDSSL Technical Report 10-087 Title: On Minimizing Average End-to-End Delay in P2P Live Streaming

    E-print Network

    Khan, Maleq

    latency, which discourages commercial IPTV deployment from the ISP end. Moreover, ISP may provide viewers streaming applica- tions have exhibited growing popularity, such as IPTV, VOIP, and video conferencing deployment of P2P systems. For example, IPTV deployment from commercial service providers is far below

  16. Phenomenon-aware data stream management systems

    Microsoft Academic Search

    Mohamed H Ali

    2007-01-01

    Recent advances in large scale data streaming technologies enabled the deployment of a huge number of streaming sources in the surrounding environment, e.g., sensor fields. Streaming sources do not live in isolation. Instead, close-by streaming sources experience similar environmental conditions. Hence, close-by streaming sources may indulge in a correlated behavior and generate a “phenomenon”. A phenomenon is characterized by a

  17. Distributed & adaptive HTTP streaming

    Microsoft Academic Search

    Stephane Gouache; Guillaume Bichot; Amine Bsila; Christopher Howson

    2011-01-01

    Adaptive streaming with HTTP has become popular in recent years, enabling continuous delivery of live and VOD content without the need for guaranteed bandwidth. It remains however challenging to maintain a smooth quality of experience under tough network conditions especially for bandwidth eater content like High Definition or 3D. In this paper we show that it is possible to both

  18. Activities: Whatzzzzup-Stream?

    NSDL National Science Digital Library

    In this set of exercises, students will study rivers and waterways around them by using the Internet, maps, and their knowledge of local landscapes. The students will use an Environmental Protection Agency (EPA) website to investigate what is upstream and downstream of them. They will also look at graphs of flow in familiar river locations on a live United States Geological Survey website. Using small rocks and a washbasin, students will build a model that extends their understanding of streams in different geographic locations. A topographic map exercise will expose students to topographic maps and allow them to look for the origins of streams. Finally, a reading exercise will illustrate the issue of the importance of lower-order streams to downstream areas and students will be asked to implement their ideas to protect a stream on a dairy farm.

  19. Ex-stream Makeover Katie Stallcup

    E-print Network

    to plants and animals that would normally live there. To restore it, the partnering agencies have taken the blueprints of nearby healthy streams. "We put that together to create engineering plans," she said. "It." Once water is diverted into the new stream, workers will fill in the old stream. By creating

  20. Streaming Media over the Internet with the Real Time Streaming Protocol

    Microsoft Academic Search

    Leggio Simone

    The Real Time Streaming protocol (RTSP) is used to control real time-like media flows over the Internet. RTSP provides support for controlling the transmission of live multimedia streams and video on demand streams. RTSP provides users means to act on the flow, as they would do with a normal Video Cassette Recorder (VCR) video, allowing to fast browsing, pausing or

  1. Gulf Stream

    NSDL National Science Digital Library

    Phillips, Pamela

    This in-depth website describes the Gulf Stream, its place in the North Atlantic Gyre, influence on weather and climate, and role of eddies and rings in distributing heat and salinity. A history, from the 16th to 20th centuries, describes scientists' developing understanding of the Gulf Stream and evolution of oceanographic instruments used to study it, with special details on satellite observations. Also covered: the importance of oceanography and the Gulf Stream to naval applications.

  2. Stream Processors

    NASA Astrophysics Data System (ADS)

    Erez, Mattan; Dally, William J.

    Stream processors, like other multi core architectures partition their functional units and storage into multiple processing elements. In contrast to typical architectures, which contain symmetric general-purpose cores and a cache hierarchy, stream processors have a significantly leaner design. Stream processors are specifically designed for the stream execution model, in which applications have large amounts of explicit parallel computation, structured and predictable control, and memory accesses that can be performed at a coarse granularity. Applications in the streaming model are expressed in a gather-compute-scatter form, yielding programs with explicit control over transferring data to and from on-chip memory. Relying on these characteristics, which are common to many media processing and scientific computing applications, stream architectures redefine the boundary between software and hardware responsibilities with software bearing much of the complexity required to manage concurrency, locality, and latency tolerance. Thus, stream processors have minimal control consisting of fetching medium- and coarse-grained instructions and executing them directly on the many ALUs. Moreover, the on-chip storage hierarchy of stream processors is under explicit software control, as is all communication, eliminating the need for complex reactive hardware mechanisms.

  3. CONNECTICUT STREAMS

    EPA Science Inventory

    This is a 1:24,000-scale datalayer of named streams in Connecticut. It includes two Shapefiles with line and polygon features. Both Shapefiles should be used together. The polygon shapefile fills in open water streams such as the Connecticut River as well as Long Island Sound. T...

  4. Stream Surveying

    NSDL National Science Digital Library

    Karen Williams

    The class breaks into groups of 3-4. Each week we go out to the same stream channel, and perform the stream survey activities in the USFS Harrelson document, one chapter per week. After the snow flies, collected data are used to calculate channel hydrologic and hydraulic data such as bankfull flow and critical shear stress. Designed for a geomorphology course

  5. Salamander occupancy in headwater stream networks

    USGS Publications Warehouse

    Grant, E.H.C.; Green, L.E.; Lowe, W.H.

    2009-01-01

    1. Stream ecosystems exhibit a highly consistent dendritic geometry in which linear habitat units intersect to create a hierarchical network of connected branches. 2. Ecological and life history traits of species living in streams, such as the potential for overland movement, may interact with this architecture to shape patterns of occupancy and response to disturbance. Specifically, large-scale habitat alteration that fragments stream networks and reduces connectivity may reduce the probability a stream is occupied by sensitive species, such as stream salamanders. 3. We collected habitat occupancy data on four species of stream salamanders in first-order (i.e. headwater) streams in undeveloped and urbanised regions of the eastern U.S.A. We then used an information-theoretic approach to test alternative models of salamander occupancy based on a priori predictions of the effects of network configuration, region and salamander life history. 4. Across all four species, we found that streams connected to other first-order streams had higher occupancy than those flowing directly into larger streams and rivers. For three of the four species, occupancy was lower in the urbanised region than in the undeveloped region. 5. These results demonstrate that the spatial configuration of stream networks within protected areas affects the occurrences of stream salamander species. We strongly encourage preservation of network connections between first-order streams in conservation planning and management decisions that may affect stream species.

  6. What Lives Here

    NSDL National Science Digital Library

    Lawrence Hall of Science

    1980-01-01

    In this outdoor activity/field trip, learners explore an aquatic site such as a pond, lake, stream, river or seashore to find and investigate plants and animals that live in water. Learners use dip nets to scoop up as many different organisms as they can for observation. This is a great introduction to the life of aquatic systems.

  7. 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…

  8. Low overhead container format for adaptive streaming

    Microsoft Academic Search

    Haakon Riiser; Pål Halvorsen; Carsten Griwodz; Dag Johansen

    2010-01-01

    Current segmented HTTP streaming systems provide scalable and quality adaptive video delivery services to a huge number of users. However, while they support a wide range of bandwidths and enable arbitrary content-based composition, their current formats have shortcomings like large overheads, live streaming delays, etc. We have therefore developed an adaptive media player that works around these problems while still

  9. Stream Consciousness

    NSDL National Science Digital Library

    2014-09-18

    During this activity, students will learn how environmental engineers monitor water quality in resource use and design. They will employ environmental indicators to assess the water quality of a nearby stream. Students will make general observations of water quality as well as count the number of macroinvertabrates. They will then use the information they collected to create a scale to rate how good or bad the water quality of the stream. Finally, the class will compare their numbers and discuss and defend their results.

  10. Stream Floods

    NSDL National Science Digital Library

    Warren Huff

    2000-11-03

    This exercise is designed to explore the nature of floods and flood prediction. Prediction of flooding relies heavily upon statistical techniques based on historical records of stream behavior. This series of exercises first reviews basic concepts in flood prediction such as calculating the Recurrence Interval (RI), which is the average interval in years between occurrences of two discharges of equal magnitude; and the Weibull equation, which calculates the probability that a given discharge will be exceeded in any particular year. The student then accesses historical data on U.S. stream flow and performs these calculations independently.

  11. Multimedia streaming via TCP: an analytic performance study

    Microsoft Academic Search

    Bing Wang; James F. Kurose; Prashant J. Shenoy; Donald F. Towsley

    2004-01-01

    TCP is widely used in commercial media streaming systems, with recent measurement studies indicating that a significant fraction of Internet streaming media is currently delivered over HTTP\\/TCP. These observations motivate us to develop analytic performance models to systematically investigate the performance of TCP for both live and stored media streaming. We validate our models via ns simulations and experiments conducted

  12. Multimedia streaming via TCP: An analytic performance study

    Microsoft Academic Search

    Bing Wang; Jim Kurose; Prashant J. Shenoy; Donald F. Towsley

    2008-01-01

    TCP is widely used in commercial multimedia streaming systems, with recent measurement studies indicating that a significant fraction of Internet streaming media is currently delivered over HTTP\\/TCP. These observations motivate us to develop analytic performance models to systematically investigate the performance of TCP for both live and stored-media streaming. We validate our models via ns simulations and experiments conducted over

  13. Authenticating Streamed Data in the Presence of Random Packet Loss

    E-print Network

    Golle, Philippe

    Authenticating Streamed Data in the Presence of Random Packet Loss (Extended Abstract) Philippe for authenticating streamed data delivered in real-time over an insecure network. The difficulty of signing live. Secondly, authentication must be possible even if some packets in the sequence are missing. Streams

  14. Living and Non Living Organisms

    NSDL National Science Digital Library

    Ms. Henrie

    2009-11-18

    Core Curriculum Standard II: Students will understand that organisms depend on living and non living things within their environment. Introduction At the end of this assignment you should know the difference between a living and a non living organism and understand the effect a new environment (both living and non living things) can have on a living organism and the effect that living organism can have on the environment. ...

  15. Stream Table

    NSDL National Science Digital Library

    Science Friday

    2010-01-01

    In this activity, learners use aluminum trays and wooden blocks to form stream tables to investigate river formations in two different landscape scenarios. Learners compare and contrast how the formation of the river differs if the topography of the land is changed from a flat plain to a terrain with hills and valleys.

  16. Jet Streams

    NSDL National Science Digital Library

    COMET

    2012-11-13

    This module describes the general characteristics of upper-level jet streams (Polar Jet, Subtropical Jet, and Tropical Easterly Jet) and two major tropical low-level wind maxima (Somali Jet, African Easterly Jet). Included are discussions of their formation, maintenance, influence on synoptic weather, and role in the general circulation.

  17. 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.

  18. NAP: An Agent-based Scheme on Reducing Churn-Induced Delays for P2P Live Peer-to-peer (P2P) multimedia streaming provides a scal-

    E-print Network

    Khan, Maleq

    -to-peer (P2P) multimedia streaming provides a scal- able solution for IPTV. However, delays from channel, and playback lag are hindering the extensive com- mercial deployment of P2P systems [3]. For example, IPTV

  19. Scientific Programming 12 (2004) 213223 213 Framework for bringing data streams to the

    E-print Network

    Plale, Beth

    2004-01-01

    Scientific Programming 12 (2004) 213­223 213 IOS Press Framework for bringing data streams@cs.indiana.edu Abstract. Data streams are a prevalent and growing source of timely data, particularly in the scientific live data streams. But efforts to date to bring streaming data to the grid have lacked generality

  20. Methodologies for generating HTTP streaming video workloads to evaluate web server performance

    Microsoft Academic Search

    Jim Summers; Tim Brecht; Derek Eager; Bernard Wong

    2012-01-01

    Recent increases in live and on-demand video streaming have dramatically changed the Internet landscape. In North America, Netflix alone accounts for 28% of all and 33% of peak downstream Internet traffic on fixed access links, with further rapid growth expected [26]. This increase in streaming traffic coincides with the steady adoption of HTTP for use in video streaming. Many streaming

  1. Real Time Streaming Protocol (RTSP)

    Microsoft Academic Search

    H. Schulzrinne; A. Rao; R. Lanphier

    1998-01-01

    The Real Time Streaming Protocol, or RTSP, is an application-level protocol for control over the delivery of data with real-time properties. RTSP provides an extensible framework to enable controlled, on-demand delivery of real-time data, such as audio and video. Sources of data can include both live data feeds and stored clips. This protocol is intended to control multiple data delivery

  2. Streams and Drainage Systems

    NSDL National Science Digital Library

    Stephen Nelson

    This page introduces streams and channels and describes the geometry and dynamics of stream channels, including cross sectional shape, discharge, long profiles, base level, laminar and turbulent flow, the load of the stream, and floods. The site explains channel patterns, including straight, meandering and braided channels; erosion by streams; stream deposits, including floodplains and levees, terraces, alluvial fans, and deltas; and drainage systems, including drainage basins and divides, stream order, drainage patterns and continental divides.

  3. Stream ecosystems change with urban development

    USGS Publications Warehouse

    Bell, Amanda H.; James, F. Coles; McMahon, Gerard

    2012-01-01

    The healthy condition of the physical living space in a natural stream—defined by unaltered hydrology (streamflow), high diversity of habitat features, and natural water chemistry—supports diverse biological communities with aquatic species that are sensitive to disturbances. In a highly degraded urban stream, the poor condition of the physical living space—streambank and tree root damage from altered hydrology, low diversity of habitat, and inputs of chemical contaminants—contributes to biological communities with low diversity and high tolerance to disturbance.

  4. Texas Stream Team Texas Stream Team Mission

    E-print Network

    Texas Stream Team #12;#12;Texas Stream Team Mission Expand understanding and awareness of water quality and nonpoint source pollution issues across Texas #12;Texas Stream Team Strategy Education, data- Texas Watch Begins I #12;Background 1991-1998 TWC/TNRCC Program Program: Data Collection, Water Quality

  5. 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 ...

  6. Lively Science

    NSDL National Science Digital Library

    Juliana Texley

    2002-01-01

    Maintaining living things in a classroom requires knowledge and preparation. It also requires the proper equipment and space. There are two primary goals in the study of living things: first, we want our students to respect life, and second, we want them to appreciate its complexity in nature. Observing healthy living things in school accomplishes both goals. This chapter describes the appropriate precautions that should be taken into consideration when bringing living organisms into classrooms.

  7. Selective Frame Discard for Video Streaming over IP Networks

    Microsoft Academic Search

    Ricardo N. Vaz; Mário S. Nunes

    In this paper we present two new selective frame discard algorithms for live video streaming over IP networks. Both algorithms consist in pre-emptively discarding frames at the sender to achieve the lowest impact possible on quality whenever congestion occurs. The video is streamed using the DCCP protocol, which has congestion control mechanism built in, as described in the paper. The

  8. Assistant Professor -Tenure Stream Job Posting: June 1, 2013

    E-print Network

    Toronto, University of

    3 Assistant Professor - Tenure Stream Job Posting: June 1, 2013 Description: The Department and the doctoral stream of the Graduate Department of Rehabilitation Science. The successful candidate will have of Toronto provides the opportunity to teach, conduct research and live in one of the most culturally

  9. Comparing MPEG AVC and SVC for adaptive HTTP streaming

    Microsoft Academic Search

    Hari Kalva; Velibor Adzic; Borko Furht

    2012-01-01

    Adaptive video streaming over HTTP is fast becoming a preferred way for delivering on-demand as well as live video service. The MPEG committee is finalizing a standard for Dynamic Adaptive Streaming over HTTP (DASH) and there is significant industry interest in this solution. DASH assumes\\/specifies MPEG AVC for content delivery. We analyze the use of MPEG scalable video coding (SVC)

  10. Distributed Delivery System for Time-shifted Streaming Systems

    E-print Network

    Paris-Sud XI, Université de

    (IPTV, life-stream services, etc.), an attractive feature consists in allowing users to access past. I. INTRODUCTION The delivery of television over the Internet (IPTV) is expected to offer viewers new, delivery systems for IPTV can not be utilized because, contrarily to live streaming systems, time

  11. 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 is that the highly dynamic multicast members can make data delivery unreliable. In this paper, we address this issue in the context of live media streaming by exploring 1) how to construct a stable multicast tree that minimizes

  12. A Live Intranet Distance Learning System using MPEG4 over RTP\\/RTSP

    Microsoft Academic Search

    Peter H. Westerink; Lisa Amini; Sundar Veliah; Will Belknap

    2000-01-01

    This paper describes an application where multiple live audio\\/visual data streams are combined in MPEG-4 and streamed via RTP\\/RTSP. The scenario involves the video and audio of a classroom instructor, where the overhead foils the instructor may use are sent as an additional separate data stream. The three streams are encapsulated in MPEG-4 systems, which adds synchronization among the streams

  13. 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.

  14. Live work

    SciTech Connect

    Garfinkel, P.

    1995-09-01

    The practice of performing maintenance on live transmission lines has surged dramatically in the past two decades, as economic concerns have made the construction of redundant lines impractical. These days, utilities face the added pressure of the increasing demand for power and the need to accomplish the tasks quickly with smaller crews. Responding to utility needs, EPRI launched the `Live Working 2000` project in 1993. Through this project, researchers conduct tests of new tools and techniques at the Institute`s Power Delivery Center in Lenox, Massachusetts. The resulting data are made available to utilities and to regulatory groups that govern the practice of live working. 3 refs., 5 figs.

  15. Orca Live

    NSDL National Science Digital Library

    The brainchild of orca biologist Dr. Paul Spong, this Nature Network Web site aims to "relay live sound and images of the orcas in the natural environment of Hanson Island," near Vancouver Island, Canada. Live sound and image feeds are available at 56K and 300K connections, and, by completing a simple registration, visitors will be alerted via email whenever orcas are near the cameras and mikes. Click on Highlights 2000 to see and hear past Web casts of orcas activity. This Web site links to others that relay live images and sounds from animals located around the world.

  16. Clustering Data Streams

    Microsoft Academic Search

    Sudipto Guha; Nina Mishra; Rajeev Motwani; Liadan O'callaghan

    2000-01-01

    We study clustering under the data stream modelof computation where: given a sequence of points, theobjective is to maintain a consistently good clustering ofthe sequence observed so far, using a small amount ofmemory and time. The data stream model is relevantto new classes of applications involving massive datasets, such as web click stream analysis and multimediadata analysis. We give constant-factor

  17. stream hydrology field lab

    NSDL National Science Digital Library

    Anne Carey

    In this lab we take a brief field trip to Adena Brook, a first order tributary of the Olentangy River in central Ohio. We observe the stream, its setting, its bedrock, determine some stream velocity profiles, and measure some basic chemical and physical properties of the stream water.

  18. Lightweight Streaming Protocol (LSP)

    Microsoft Academic Search

    Emir Mulabegovic; Dan Schonfeld; Rashid Ansari

    2002-01-01

    A new streaming protocol is proposed for multimedia applications. The proposed protocol, referred to as Lightweight Streaming Protocol (LSP), is an application layer protocol that sits atop UDP. The protocol is intended to improve the quality and reliability of media stream by borrowing features from reliable protocols such as retransmission and flow control while not sacrificing performance. The protocol offers

  19. Middle School Stream Investigation: observing stream erosion, calculating stream discharge, and determining stream chemistry and turbidity

    NSDL National Science Digital Library

    This stream field investigation will allow students to look at stream erosional patterns, take measurements to determine discharge, and conduct a chemical and turbidity analysis of Garvin Brook in Stockton, MN. Based on this investigation students will create a presentation that includes a new testable question that may be carried out the following year along with a stream ecology study.

  20. 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...

  1. Classifying Evolving Data Streams Using Dynamic Streaming Random Forests

    E-print Network

    Classifying Evolving Data Streams Using Dynamic Streaming Random Forests H. Abdulsalam, D. B,skill,martin@cs.queensu.ca Abstract. We consider the problem of data-stream classification, introducing a stream-classification algorithm, Dynamic Streaming Random Forests, that is able to handle evolving data streams using an entropy

  2. 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. ...

  3. ConcepTest: Stream Convergence

    NSDL National Science Digital Library

    The diagram depicts the confluence of two perennial streams (A and B) forming C. Which of the following statements regarding stream C must be true? a. Stream flow velocity is greater than in A or B. b. Stream ...

  4. 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 ...

  5. 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. ...

  6. The Signature Engineering Building's Instrumenta5on Program: A Living Laboratory for Research and

    E-print Network

    Buehrer, R. Michael

    will include live streaming of data from selected loca5ons Applica5on and registra5onThe Signature Engineering Building's Instrumenta5on Program: A Living Laboratory, Mechanical Engineering Associate Director, VT Smart Infrastructure Laboratory http

  7. Transparent protocol translation and load balancing on a network processor in a media streaming scenario

    Microsoft Academic Search

    Håvard Espeland; Carl Henrik Lunde; Håkon Kvale Stensland; Carsten Griwodz; Pål Halvorsen

    2008-01-01

    Today, major newspapers and TV stations make live and on-demand audio\\/video content available, video-on-demand services are becoming common and even personal media are frequently uploaded to streaming sites. The discussion about the best transport protocol for streaming has been going on for years. Currently, HTTP-streaming is usual although the transport of streaming media data over TCP is hindered by TCP's

  8. Stream Systems Technology Center

    NSDL National Science Digital Library

    The Stream Systems Technology Center is a national technical center of the US Forest Service, designed to improve knowledge of stream systems and processes and to provide training and technical support to National Forests. Although the "Download Area" is still under construction, users may currently access full issues (indexed by date or subject) of the agency's quarterly newsletter, Stream Notes. Articles cover diverse topics from fluvial processes (Geomorphology, River Morphology, Historical Changes in Mountain Streams, etc.) to future technologies (sediment technology, data loggers, stream data collection, etc.). Also of interest are the Conferences, Symposiums, and Other Information section and the Related Websites section.

  9. Living Proof Podcast Series

    NSDL National Science Digital Library

    2012-10-15

    This podcast series is part of the SUNY University at Buffalo's School of Social Work outreach efforts and is a rather fascinating and useful resource. The purpose of the series is "to engage practitioners and researchers in lifelong learning and to promote research to practice, practice to research." The conversations here include interviews with top-notch researchers, professors, and others. On this site, visitors can browse through past podcasts, which include conversations about topics like online bullying, community organizing, and developing an effective relationship with patients. Also, visitors can sign up to receive each new podcast when it is released via iTunes. Finally, users are encouraged to leave feedback on the episodes they find compelling.

  10. Stream Table Lab

    NSDL National Science Digital Library

    Sara M. Rutzky

    Students work in groups around home-made stream tables. Each person in the group is assigned a role that is involved in maintaining the stream table (such as the hose-holder, the bucket-holder, the person who turns on and off the water, and the recorder). As a group, they turn on the water and observe what happens when water and sand interact on a slope. Once a stream has formed, they draw the stream, noting locations where erosion and deposition have occurred. Then, they take measurements of the stream channel and stream flow in order to calculate velocity, sinuosity, gradient, and discharge. This activity encourages students to work in groups, use math within a scientific context, and learn about how streams work in a hands-on manner.

  11. Innovative Lives

    NSDL National Science Digital Library

    The Innovative Lives Web Site is offered by the Jerome and Dorothy Lemelson Center for the Study of Invention and Innovation and the Smithsonian Institution. "Innovative Lives counters commonly held stereotypes about inventors by featuring speakers with diverse backgrounds," such as Dr. Patricia Bath, an African-American woman who invented the Laserphaco Probe for the treatment of cataracts and founded the American Institute for the Prevention of Blindness. Over thirty inventors are featured on the site, which gives excellent information about each, telling of their lives and what they have accomplished. Although it is intended for kids, the site will be of interest to anyone looking to learn about many of the most important and unknown contributors to the scientific world.

  12. Living Heritage

    NSDL National Science Digital Library

    Living Heritage is a website that celebrates New Zealand heritage through the help of the schools and students of New Zealand. The "About Living Heritage" link states that the website is "an online bilingual initiative that enables New Zealand schools to develop and publish an online resource, based on a heritage treasure in their community." Visitors can also read about the five or so groups these stories "Benefit", including New Zealand and the World, in the About Living Heritage link. The "Schools' Stories" link takes visitors to 26 schools' websites produced since 2008, and an archive of 79 schools' websites produced before 2008. By browsing through the stories, visitors can learn about Paddy, the much-loved wandering Airedale who lived on Island Bay in Wellington in the 1930s. The story of Mitiaro High School in the Cook Islands describes how they learned how to build a canoe called a paiere. Finally, a group of Year 1 and 2 students at Russley School write about their discovery that a tree near their school is protected by the city council.

  13. Living Nanomachines

    Microsoft Academic Search

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

    2009-01-01

    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

  14. Independent Living.

    ERIC Educational Resources Information Center

    Nathanson, Jeanne H., Ed.

    1994-01-01

    This issue of "OSERS" addresses the subject of independent living of individuals with disabilities. The issue includes a message from Judith E. Heumann, the Assistant Secretary of the Office of Special Education and Rehabilitative Services (OSERS), and 10 papers. Papers have the following titles and authors: "Changes in the Rehabilitation Act of…

  15. Living fluids

    NASA Astrophysics Data System (ADS)

    Misbah, Chaouqi; Wagner, Christian

    2013-06-01

    One of the major emerging fields of research of the beginning of this century concerns living fluids. By "living fluids", we mean two major categories of complex fluids: (i) fluids which are essential to life, like blood, and (ii) active fluids made of particles that are able to propel themselves in the suspending fluid by converting a form of their energy into mechanical motion. Studies on active fluids have known a considerable interest since the last decade. Blood might be viewed as an old topic, but the progresses in experimental techniques, analytical concepts and numerics, have contributed nowadays to a dramatic renewal of the interest in this field, with a great potential towards understanding physical and mechanical factors in cardiovascular diseases. These fields have considerably strengthened interdisciplinary research. The series of reviews of this dossier focus on the tremendous recent progress achieved in research on living fluids both from the experimental and theoretical points of views. These reviews present also the major open issues, making of this dossier a unique guide for future research in these fields. This project grew up thanks to the international summer school that we organized on the topic "living fluids" at the IES (Institut d'études scientifiques) of Cargèse (Corsica) in 2012.

  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. Exploiting loop-dependent stream reuse for stream processors

    Microsoft Academic Search

    Xuejun Yang; Ying Zhang; Jingling Xuey; Ian Rogersz; Gen Li; Guibin Wang

    2008-01-01

    The memory access limits the performance of stream proces- sors. By exploiting the reuse of data held in the Stream Reg- ister File (SRF), an on-chip storage, the number of memory accesses can be reduced. In current stream compilers reuse is only attempted for simple stream references, those whose start and end are known. Compiler analysis from outside of stream

  18. The Andromeda Stream

    E-print Network

    G. F. Lewis; R. A. Ibata; S. C. Chapman; A. M. N. Ferguson; A. W. McConnachie; M. J. Irwin; N. Tanvir

    2004-01-07

    The existence of a stream of tidally stripped stars from the Sagittarius Dwarf galaxy demonstrates that the Milky Way is still in the process of accreting mass. More recently, an extensive stream of stars has been uncovered in the halo of the Andromeda galaxy (M31), revealing that it too is cannibalizing a small companion. This paper reports the recent observations of this stream, determining it spatial and kinematic properties, and tracing its three-dimensional structure, as well as describing future observations and what we may learn about the Andromeda galaxy from this giant tidal stream.

  19. 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.

  20. 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.

  1. 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.

  2. PERCENT AGRICULTURE ADJACENT TO STREAMS

    EPA Science Inventory

    The type of vegetation along a stream influences the water quality in the stream. Intact buffer strips of natural vegetation along streams tend to intercept pollutants before they reach the stream. High percentages of agriculture along streams increase the likelihood of elevated ...

  3. 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.

  4. Estuary Live!

    NSDL National Science Digital Library

    Classrooms and individuals can log on to participate in a real-time field trip to a National Estuary Research Reserve. Ask questions, view live video and still images, and learn about estuaries from experts. Topics range from geology to water quality, estuary plants and animals, and cultural heritage. Includes: references and lesson plans, classroom activities and teachers' guides. Archives of previous years are available, featuring sessions from East, West and Gulf Coast estuaries.

  5. Macrophyte communities of European streams with altered physical habitat

    Microsoft Academic Search

    Mattie T. O’Hare; Annette Baattrup-Pedersen; Rebi Nijboer; Krzysztof Szoszkiewicz; Teresa Ferreira

    2006-01-01

    The impact of altering hydro-morphology on three macrophyte community types was investigated at 107 European stream sites.\\u000a Sites were surveyed using standard macrophyte and habitat survey techniques (Mean Trophic Rank Methodology and River Habitat\\u000a Survey respectively). Principal Components Analysis shows the macrophyte community of upland streams live in a more structurally\\u000a diverse physical habitat than lowland communities. Variables representing the

  6. STREAM NETWORK TEMPERATURE

    EPA Science Inventory

    The Stream Network Temperature (SNTEMP) model is a mechanistic, one-dimensional heat transport formulation that predicts daily mean and maximum water temperature as a function of stream distance and environmental heat flux. Net heat flux is calculated as the sum of heat to or fr...

  7. 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 ...

  8. Solar wind stream interfaces

    Microsoft Academic Search

    J. T. Gosling; J. R. Asbridge; S. J. Bame; W. C. Feldman

    1978-01-01

    Measurements aboard Imp 6, 7, and 8 reveal that approximately one third of all high-speed solar wind streams observed at 1 AU contain a sharp boundary (of thickness less than approx.4 x 10⁴ km) near their leading edge, called a stream interface, which separates plasma of distinctly different properties and origins. Identified as discontinuities across which the density drops abruptly,

  9. Ramification of stream networks

    PubMed Central

    Devauchelle, Olivier; Petroff, Alexander P.; Seybold, Hansjörg F.; Rothman, Daniel H.

    2012-01-01

    The geometric complexity of stream networks has been a source of fascination for centuries. However, a comprehensive understanding of ramification—the mechanism of branching by which such networks grow—remains elusive. Here we show that streams incised by groundwater seepage branch at a characteristic angle of 2?/5 = 72°. Our theory represents streams as a collection of paths growing and bifurcating in a diffusing field. Our observations of nearly 5,000 bifurcated streams growing in a 100 km2 groundwater field on the Florida Panhandle yield a mean bifurcation angle of 71.9° ± 0.8°. This good accord between theory and observation suggests that the network geometry is determined by the external flow field but not, as classical theories imply, by the flow within the streams themselves. PMID:23223562

  10. Disentangling the Hercules stream

    E-print Network

    T. Bensby; M. S. Oey; S. Feltzing; B. Gustafsson

    2006-12-21

    Using high-resolution spectra of nearby F and G dwarf stars, we have investigated the detailed abundance and age structure of the Hercules stream. We find that the stars in the stream have a wide range of stellar ages, metallicities, and element abundances. By comparing to existing samples of stars in the solar neighbourhood with kinematics typical of the Galactic thin and thick disks we find that the properties of the Hercules stream distinctly separate into the abundance and age trends of the two disks. Hence, we find it unlikely that the Hercules stream is a unique Galactic stellar population, but rather a mixture of thin and thick disk stars. This points toward a dynamical origin for the Hercules stream, probably caused by the Galactic bar.

  11. Living Clocks

    NSDL National Science Digital Library

    Nancy P. Moreno

    2009-01-01

    In this activity about daily rhythms (on page 17 of the PDF), learners will explore circadian patterns in humans, animals and plants. They will observe that some behaviors and functions of living organisms vary predictably every 24 hours and many regular functions are governed by internal "clocks," which run independently but are cued or reset by the environment. Groups of learners can conduct one of four (or more) body clock investigations: body temperature, animal behavior, bean leaf, and alertness/heart rate. Materials required for each group will vary, depending on the investigation(s) being conducted. This lesson guide includes background information, setup and management tips, extensions and a handout.

  12. UNM Live

    NSDL National Science Digital Library

    If you can't make it to the University of New Mexico campus in Albuquerque, why not tune in to their events online? This is now possible, courtesy of the UNM Live website. The function of this site is to bring "educational resources to a wider audience", and their focus is quite catholic, with talks on student aid, podcasts on anthropology, and so on. Visitors can learn about the initiative via the "About UNM Live" section of the site, and for more general information, they can look over the "What is a podcast? How do I subscribe?" area. First-time visitors should start by listening to Professor Jerry Shea talk about the Swahili terms "Sasa" and "Zamani" for a good introduction to the site. The social networking media options are quite easy to use, and visitors can recommend various media clips and programs to friends and others. Also, visitors can use the "Categories" area to look for materials related to campus life, arts, business, education, and current affairs.

  13. Estuary Live!!!

    NSDL National Science Digital Library

    Intended for elementary, middle, and high school students, this electronic estuary excursion, Estuary Live!!!, will take place May 8-12, 2000. Free to participants (but please sign up in advance), the field trip will explore the Rachel Carson Site of the North Carolina National Estuarine Research Reserve, covering four islands and salt marshes off the North Carolina coast. The site features useful educational materials, including a photo-illustrated field guide (of the "ecology, habitats and specific plants and animals found in North Carolina's estuaries"); lesson plans (covering highschool biology, estuary habitats, species interactions, and adaptations and communities); and a series of related links. The interactive field trip will require a java-enabled browser, RealVideo (to see a moving image and hear sound), and/or Chatvideo, to see a moving image, ask questions of the naturalist leading the trip, and receive responses via a chat window. Note that ChatVideo requires Netscape 4.0 or better and will not work with AOL or Internet Explorer, and pages "look best" on a screen with resolution of 800x600. The Estuary Live!!! Website is provided by the North Carolina National Estuarine Research Reserve Program, and The Center for Science, Mathematics and Technology Education at East Carolina University.

  14. Stream Gages and GIS

    NSDL National Science Digital Library

    Welch, Brian C.

    2008-04-18

    This exercise from SERC's Starting Point utilizes the national network of stream gage data provided by the USGS Water Resources Division as an online Geographic Information System (GIS). Students use real-time stream flow data to interpret recent regional-scale climate events based on current stream flow data, monitor changes in time, and consider additional interpretations that could be derived if other data were in map form. This exercise may be used to consider regional-scale conceptual problems in tandem with the traditional hydrology exercises.

  15. StreamCloud: A Large Scale Data Streaming System

    E-print Network

    Politécnica 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. Research efforts on data streaming have mainly focused on scaling in the number of queries or query

  16. American Lives

    NSDL National Science Digital Library

    Started as part of the American Culture studies program at Washington University, the American Lives Project is "a new resource for cultural inquiry that allows users to build connections and identify differences between materials." The project brings together oral histories, historical documents, artifacts, sound, and visual media into an online collection that serves as a model for others seeking to do such work. This particular project documents student activism at Washington University from 1964 to 1972. First-time visitors should look at the About area to learn about the design team, the goals of the project, and the technical aspects of this work. Moving on, visitors can click on the How to Use tab for information about examining the collection. Visitors will find protest banners, letters, handouts, photographs by student groups, and links to related media. Also, visitors can create their own curated collections via the My Objects area, which is a great way to highlight items of personal interest. [KMG

  17. Living Links

    NSDL National Science Digital Library

    Hosted by the Yerkes Regional Primate Research Center at Emory University, the Living Links site specializes in "comparisons of the social life, ecology, cognition, neurology, and molecular genetics of apes and humans." With an emphasis on the four extant great apes (bonobos, chimpanzees, gorillas, and orangutans), this educational site attempts "1) to reconstruct human evolution, 2) pinpoint the differences and similarities between humans and apes, and 3) educate the public about apes, and promote their well-being and conservation." The Info section provides a long (hyperlinked) list of general information on apes, from Allogrooming to Wooly spider monkeys. The Research section gives a brief overview of the Yerkes Center's research questions (and their evolutionary context), and Animals describes the Center's study animals -- three main social groups of chimpanzees -- with a special vocalizations feature. For those interested in learning more about apes and how our ancestry is intertwined with theirs, this site will be of interest.

  18. Stream Channel Morphology

    NSDL National Science Digital Library

    Hooke, Janet

    This sites shows how measurements of channel morphology relate to stream discharge estimates. It also describes other factors to be considered when evaluating this subject such as: the human element, measurement techniques and possible applications of these methods.

  19. WaveScript: A Case-Study in Applying a Distributed Stream-Processing Language

    E-print Network

    Newton, Ryan

    2008-01-31

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

  20. Streams, Flows and Torrents

    Microsoft Academic Search

    Nevil Brownlee; Margaret Murray

    2001-01-01

    RTFM (RFCs 2720-2724) considers network traffic as being made up of bidirectional flows, which are arbitrary groupings of packets defined only by attributes of their end-points. This paper extends RTFM's view of traffic by adding two further concepts, streams and torrents. Streams are individual IP sessions (e.g. TCP or UDP) between ports on pairs of hosts, while a torrent refers

  1. The Quality of Our Nation's Waters Mercury in the Nation's Streams--Levels, Trends, and Implications

    E-print Network

    Torgersen, Christian

    the Earth, its natural and living resources, natural hazards, and the environment, visit httpThe Quality of Our Nation's Waters Mercury in the Nation's Streams--Levels, Trends. Wentz). #12;The Quality of Our Nation's Waters Mercury in the Nation's Streams--Levels, Trends

  2. The Quality of Our Nation's Waters Nutrients in the Nation's Streams and Groundwater, 19922004

    E-print Network

    Pasternack, Gregory B.

    The Quality of Our Nation's Waters Nutrients in the Nation's Streams and Groundwater, 1992­2004 U in the Nation's Streams and Groundwater, 1992­2004 By Neil M. Dubrovsky, Karen R. Burow, Gregory M. Clark, Jo--the Federal source for science about the Earth, its natural and living resources, natural hazards

  3. 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…

  4. Sampling stream invertebrates using electroshocking techniques: implications for basic and applied research

    Microsoft Academic Search

    Brad W. Taylor; Angus R. McIntosh; Barbara L. Peckarsky

    2001-01-01

    We present a new technique using electrofishing equipment to collect and quantitatively sample stream inver- tebrates. We used an electrofishing machine with a small anode to produce a localized field of pulsed direct current to induce invertebrate drift. We quickly obtained large numbers of live invertebrates for experiments by passing the anode over the stream bottom upstream of sampling nets.

  5. Mobility-aware peer-to-peer live-streaming

    Microsoft Academic Search

    Markus Trapp; Mathias Fischer; Guenter Schaefer

    2010-01-01

    Application Layer Multicast (ALM) has become a popular form of content distribution. It shows some favourable properties like inherent scalability and the overcoming of the traditional client-server bottleneck. In the future, a large fraction of the participants in ALM systems will be mobile (eg. smart-phones or netbooks) and demand for a proper inclusion and mobility handling. After analyzing current mobility

  6. HTTP Live Streaming Bandwidth Management Using Intelligent Segment Selection

    Microsoft Academic Search

    Kevin J. Ma; Radim Bartos

    2011-01-01

    HTTP-based segmented delivery has become a popular choice for video distribution. The ability for clients to explicitly perform dynamic bitrate adaptation on segment boundaries has allowed clients to optimize the end user viewing experience. Client-based rate adaptation schemes, though, are typically greedy in nature and within the context of the network as a whole, these schemes may be sub-optimal. In

  7. Influence of Effective Handoff Latency on Live Streaming Services

    Microsoft Academic Search

    Manuel Vilas; David Melendi; Xabiel G. Pañeda; Roberto García; Victor García

    Nowadays, wireless LAN networking is one of the most extended LAN access technologies. The flexibility and per- formance obtained using this type of technology make them very useful in a lot of applications, from SOHO environ- ments to wireless LAN hot spots. Nevertheless, the particu- lar characteristics of these networks may have a strong influence on the behaviour of mature

  8. Situation-awareness and sensor stream mining for sustainable society

    Microsoft Academic Search

    Z. ur Rehman; M. Shaheen

    2009-01-01

    Criminal activities are causing a huge amount of loss both in term of financial and human lives. Due to these acts, business and social sectors are striving. This paper is aimed to develop an online sensor stream mining system, able to analyze situational behavior of all persons in some specific vicinity and proposes real-time alert system to take countermeasures. This

  9. Welcome to SWAMP The Stream and Wetland Assessment Management Park

    E-print Network

    invertebrates, fish, amphibians, and reptiles to live. #12;Wetlands are for the Birds! Stream and Wetland Assessment Management Park SWAMP Duke University Wetland Center Birds in the Duke Forest Wetland Water Birds Song BirdsDoes restoration affect ti bi d i ? Nicholas School of the Environment www.nicholas.duke.edu/wetland

  10. Examining topography and stream discharge at Sherburne National Wildlife Refuge

    NSDL National Science Digital Library

    Todd Koenig Zimmerman High School ISD 728 Zimmerman, MN I will be using a modified concept of the contour mapping exercise we did at St. Thomas and the Hydrology flow lab we preformed at Coon Creek.

    In this inquiry based geologic field lab students will be estimating and measuring stream flow. Students will also map out a full scale live topography map of a dry streambed to help them estimate flow discharge. Students will use their journals to record their hypothesis, lab report questions, graphed data and evidence to backs up their observations.

  11. The Gulf Stream Voyage

    NSDL National Science Digital Library

    The Gulf Stream Voyage is an online multidisciplinary project which utilizes both real time data and primary source materials to help guide students to discover the science and history of the Gulf Stream. Students investigate the driving forces behind this ocean current, how it affects the Atlantic Ocean and some of mankind's experiences dealing with it. This voyage includes activities for marine science, earth science, chemistry, physics, biology, math, history and language arts. This project has been developed to be used as a complete tutorial on the Gulf Stream. However, the activities are presented in a manner so that each may be used individually to supplement traditional classroom lessons. Students access real time ocean data, atmospheric data and historical primary source materials. Students utilize these resources, all in the context of an authentic real world problem.

  12. Visualizing Data Streams

    SciTech Connect

    Wong, Pak C.; Foote, Harlan P.; Adams, Daniel R.; Cowley, Wendy E.; Leung, Lai R.; Thomas, James J.

    2004-12-01

    We introduce two dynamic visualization techniques using multi-dimensional scaling to analyze transient data streams such as newswires and remote sensing imagery. While the time-sensitive nature of these data streams requires immediate attention in many applications, the unpredictable and unbounded characteristics of this information can potentially overwhelm many scaling algorithms that require a full re-computation for every update. We present an adaptive visualization technique based on data stratification to ingest stream information adaptively when influx rate exceeds processing rate. We also describe an incremental visualization technique based on data fusion to project new information directly onto a visualization subspace spanned by the singular vectors of the previously processed neighboring data. The ultimate goal is to leverage the value of legacy and new information and minimize re-processing of the entire dataset in full resolution. We demonstrate these dynamic visualization results using a newswire corpus and a remote sensing imagery sequence.

  13. 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.

  14. Streaming Languages Compilation

    E-print Network

    Dally, William J.

    B0 Router B7 Router B24 Router B31 OE/EO OE/EO OE/EO OE/EO 16161616 OE/EO OE/EO OE/EO OE/EO 16161616 Backplane 0 Backplane 31 OE/EO 512 Router S0 Router S15 Router S511 Total Per Node 20GB/s320GB/s 5GB/s1.28TB and scalar processors Stream cache amplifies memory bandwidth for accessing streams with temporal locality 16

  15. ChunkStream: Interactive streaming of structured data

    Microsoft Academic Search

    Justin Mazzola Paluska; Hubert Pham; Steve Ward

    2010-01-01

    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. Chunks are fixed-size arrays that contain a mixture of scalar data and references to other chunks. Chunks allow programmers to expose large, but fine-grained, data structures over the

  16. ASSESSING HEADWATER STREAMS: LINKING LANDSCAPES TO STREAM NETWORKS

    EPA Science Inventory

    Headwater streams represent a significant land-water boundary and drain 70-80% of the landscape. Headwater streams are vital components to drainage systems and are directly linked to our downstream rivers and lakes. However, alteration and loss of headwater streams have occurre...

  17. StreamCloud: An Elastic and Scalable Data Streaming System

    E-print Network

    Politécnica de Madrid, Universidad

    1 StreamCloud: An Elastic and Scalable Data Streaming System Vincenzo Gulisano, Ricardo Jim´enez-Peris, Marta Pati~no-Mart´inez, Claudio Soriente, Patrick Valduriez Universidad Polit´ecnica de Madrid, Spain that lead to either under or over-provisioning. In this paper, we present StreamCloud, a scalable

  18. 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. ...

  19. Computing on data streams

    Microsoft Academic Search

    Monika Rauch Henzinger; Prabhakar Raghavan

    1998-01-01

    In this paper we study the space requirement of algorithms that makeonly one (or a small number of) pass(es) over the input data. We study suchalgorithms under a model of data streams that we introduce here. We givea number of upper and lower bounds for problems stemming from queryprocessing,invoking in the process tools from the area of communicationcomplexity.

  20. 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…

  1. Stream Management: A Rebirth

    ERIC Educational Resources Information Center

    Coler, Robert A.; Zatryka, Simon A.

    1974-01-01

    This article describes a stream management course designed to give non-science majors an in-depth study of water quality. The course includes work in determining and measuring water quality parameters and the discussion of management techniques. Construction of a Hewitt Ramp and wing deflectors are illustrated in the article. (MA)

  2. 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.

  3. 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...

  4. Stream Channel Morphology

    NSDL National Science Digital Library

    Carl Van Faasen

    2009-04-01

    When humans change the natural topography, certain effects are likely to be seen in a watershed. The transportation of water and sediment increases when streams are straightened and, with the increased flow rate of water, erosion also increases. All of th

  5. Calculating Stream Discharge

    NSDL National Science Digital Library

    Carl Van Faasen

    2009-04-01

    Streamflow, or discharge, is defined by the U.S. Geological Survey (USGS) as the volume of water flowing past a fixed point in a fixed unit of time. The discharge of a stream can be affected by many things, including topography and channel morphology. How

  6. The Mundja Streaming MAC

    Microsoft Academic Search

    Philip Hawkes; Michael Paddon; Gregory G. Rose

    Mundja is a MAC generation algorithm that has been designed for use together with a stream cipher. Mundja accumulates the message onto two indepen- dent registers: the first is a Cyclic Redundancy Checksum (CRC) that uses linear feedback; the second is a strengthened version of the SHA-256 register (5) that uses nonlinear feedback. Mundja is fast (asymptotically about 4 times

  7. 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)

  8. Interactive streaming of structured data

    Microsoft Academic Search

    Justin Mazzola Paluska; Hubert Pham

    2010-01-01

    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. Chunks are fixed-size arrays that contain a mixture of scalar data and references to other chunks. Chunks allow programmers to expose large, but fine-grained, data structures over the

  9. [Living better or living longer].

    PubMed

    Sauvy, A

    1987-01-01

    It has been just 2 centuries since France began to struggle seriously against mortality and excess fertility. Life expectancy, which for millenia had been under 30 years at birth, began to increase because of the discovery of effective treatments, improved production and standards of living, and access of large numbers of persons to health care. France, in the 2nd half of the 18th century, became the first country in which fertility regulation was achieved on a wide scale. The failure of England, a country of similar culture, to follow suit until a century later remains unexplained. After World War II, simple and fairly inexpensive means of mortality control, such as vaccines and water purifiers, became widely distributed throughout the developing world. These countries, which traditionally had mortality rates of 35 or 40/1000 and fertility of 40-45/1000, experienced rapid declines in mortality rates while their fertility remained constant or even increased. Because antinatal techniques diffused so much more slowly, the equilibrium of births and deaths was disturbed as rates of increase of 2 or 3% per year became common. Although the inhabitants of poor countries were not concerned, perhaps through ignorance of what was occurring, the rich countries were alarmed by the increase. Their principal objective became to spread contraception in the poor countries. The available methods at the time, however, were none too reliable. When oral contraceptive pills became available, fertility dropped to very low levels in Europe but such factors as cost and illiteracy discouraged use in many underdeveloped countries. Fertility declined in a few insular states such as Hong Kong, Taiwan, and Singapore even before the appearance of pills. Life expectancies in developing countries except a few in Africa have increased since World War II and are now higher than in Europe at the turn of the century. "Health for all by the year 2000" is an astonishing slogan for a serious organization such as the World Health Organization. Assurance of sufficient care to protect health would be a more realistic goal than the illusory "health for all". Future gains in mortality control will be made primarily in endogenous diseases such as cancer and cardiovascular disease that prolong life in the retirement years rather than in youth. Thorny moral and economic questions will ensue as health care for the elderly becomes more expensive and as the population ages. Contrary to a widely held belief, aging of the population is due to fertility decline rather than mortality decline. By the year 2000, health care in France may consume a larger part of household income than food. Sterilization of individuals with hereditary diseases, the influence of health care on the balance of payments, and the funding of social security systems are among the issues that will become more pressing in the future. PMID:3427520

  10. How to Sign Digital Streams

    Microsoft Academic Search

    Rosario Gennaro; Pankaj Rohatgi

    1997-01-01

    We present a new efficient paradigm for signing digital streams. The problem of signingdigital streams to prove their authenticity is substantially different from the problemof signing regular messages. Traditional signature schemes are message oriented andrequire the receiver to process the entire message before being able to authenticate itssignature. However, a stream is a potentially very long ( or infinite) sequence

  11. Wavelet decomposition of data streams

    E-print Network

    Tian, Qi

    Wavelet decomposition of data streams by Dragana Veljkovic #12;Motivation · Continuous data streams of the original wavelet #12;Discrete wavelet transform · Uses only fixed values for wavelet scales based on powers and surprises #12;Outline · Background · streams · wavelets · sketches · error analysis · Results

  12. ConcepTest: Perennial Stream Confluence

    NSDL National Science Digital Library

    The diagram depicts the confluence of two perennial streams (A and B) forming C. Which of the following statements regarding stream C must be true? a. Stream flow velocity is greater than in A or B. b. Stream ...

  13. 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...

  14. Biotech Outsourcing Strategies cmc—Biologics stream

    PubMed Central

    2010-01-01

    Now in its third year, the Biotech Outsourcing Strategies (BOS) meeting organized by Bio2Business took place at the Søhuset Conference Centre in Hørsholm, 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

  15. PPClass-M — A live online lecture system optimized for mobile access

    Microsoft Academic Search

    Weikai Xie; Chenping Lu; Zhiqiang Zhang; Yi Lin; Ruimin Shen

    2011-01-01

    While online lectures has been a mature application for desktop PC, enabling access of live online lectures from smartphones posses some unique challenges which can not be solved with existing desktop-oriented online lecture systems. We designed a new live online lectures system called PPClass-M which is optimized for mobile scenario. It adopts an enhanced HTTP-streaming based streaming protocol which can

  16. Playback Latency Reduction for Internet Live Video Services in CDN-P2P Hybrid Architecture

    Microsoft Academic Search

    Seongho Cho; Joonho Cho; Sung-Jae Shin

    2010-01-01

    Since Internet live video services provide media streaming over unmanaged networks, service cost and QoS (Quality-of-Service) are important factors for commercial deployment. For this open Internet content delivery, the CDN-P2P (Content Delivery Network-Peer-to-Peer) hybrid architecture can be an appropriate solution in terms of scalability and cost. In this live streaming system, lots of P2P (Peer-to-Peer) keeps the random unstructured graph

  17. Multi-stream inflation

    SciTech Connect

    Li, Miao; Wang, Yi, E-mail: mli@itp.ac.cn, E-mail: wangyi@itp.ac.cn [Kavli Institute for Theoretical Physics China, Key Laboratory of Frontiers in Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190 (China)

    2009-07-01

    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.

  18. Classifying Noisy Data Streams

    Microsoft Academic Search

    Yong Wang; Zhanhuai Li; Yang Zhang

    2006-01-01

    The two main challenges associated with mining data streams are concept drifting and data noise. Current algorithms mainly\\u000a depend on the robust of the base classifier or learning ensembles, and have no active mechanisms to deal noisy. However, noise\\u000a still can induce the drastic drops in accuracy. In this paper, we present a clustering-based method to filter out hard instances

  19. 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.

  20. The WG Stream Cipher

    Microsoft Academic Search

    Yassir Nawaz; Guang Gong

    2005-01-01

    In this paper we propose a new synchronous stream cipher, called WG ci- pher. The cipher is based on WG (Welch-Gong) transformations. The WG cipher has been designed to produce keystream with guaranteed randomness properties, i.e., bal- ance, long period, large and exact linear complexity, 3-level additive autocorrelation, and ideal 2-level multiplicative autocorrelation. It is resistant to Time\\/Memory\\/Data tradeofi attacks,

  1. STL conform infinite streams

    NASA Astrophysics Data System (ADS)

    Sz?gyi, Zalán; Góbi, Attila

    2013-10-01

    Self-referencing data is widely-used in lazy functional languages. This technique enables us to express infinite data with a finite structure. Since C++ is a multiparadigm language, it is possible to utilize the advantages of these functional methods in C++ programs. In this paper besides we describe the basic concept of stream-oriented programming in C++ we mainly focus on integration to the Standard Template Library (STL).

  2. Droplet Stream Generator

    Microsoft Academic Search

    G. Brenn

    \\u000a The working principle and the functioning of droplet stream generators are discussed. The essential feature of these generators\\u000a is that the size of the droplets produced can be accurately controlled. This makes the generators important tools for setting\\u000a initial or boundary conditions of the droplets in transport processes. Droplet sizes may range between 10 µm and the order\\u000a of millimeters. Droplet

  3. 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.

  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. Orbit of the Ophiuchus Stream

    NASA Astrophysics Data System (ADS)

    Sesar, Branimir; Bernard, Edouard J.; Bovy, Jo; Cohen, Judith G.; Caldwell, Nelson; Ness, Melissa; Johnson, Christian I.; Ferguson, Annette M. N.; Martin, Nicolas; Rix, Hans-Walter; Ford Schlafly, Eddie; Pan-Starrs1 Collaboration

    2015-01-01

    Ophiuchus Stream is the most recently discovered stellar stream in the Milky Way (Bernard et al. 2014). Due to its location (?5 kpc from the Galactic center) and its puzzling morphology (a thin and short stream, and yet with no visible progenitor), this stream may represent an important piece in our efforts to understand the Galactic potential and the dynamical evolution of accreted structures. In this talk, I will present a followup study of the stream during which we obtained high-quality spectroscopic data on 14 stream member stars using Keck and MMT telescopes. I will show how these newly acquired spectroscopic and existing photometric data enabled us to constrain i) the distance and line-of-sight extent of the stream, ii) the full 3D kinematics of the stream, iii) the chemical properties of the stream and the nature of its progenitor, and iv) the orbit of the stream. I will finish by discussing future prospects in this field in light of the upcoming public release of Pan-STARRS1, Palomar Transient Factory, and GAIA data.

  6. Lone Star Healthy Streams: Keeping Texas streams clean 

    E-print Network

    Boutwell, Kathryn S.

    2013-01-01

    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... Corporation. LONE STAR HEALTHY STREAMS Keeping Texas streams clean Think contaminated water only occurs in developing countries? Even in the United States, high levels of bacteria in some water bodies make them potentially unsuitable for recreation...

  7. Streams of Coal or Streams of Death? A Toxicology Case Study

    NSDL National Science Digital Library

    Linda Niedziela

    2007-01-01

    Mary Beth was raised in Western Pennsylvania, an area where thousands of abandoned coal mines have led to extensive contamination of streams and associated ground waters. Aquatic life has clearly suffered, but the health effects on people living along the waterways have not been so clear. In working through this interrupted case study, students consider the biological consequences for Mary Beth’s family by analyzing selected research articles. Originally developed for an upper level toxicology course, it would also be appropriate for a cancer biology course and could easily be adapted for a course in science and society or environmental studies.

  8. Online smoothing of live, variable-bit-rate video

    Microsoft Academic Search

    J. Rexford; S. Sen; J. Dey; W. Feng; J. Kurose; J. Stankovic; D. Towsley

    1997-01-01

    Bandwidth smoothing techniques are effective at reducing the burstiness of a compressed, pre-recorded video stream by prefetching frames into the client playback buffer in advance of each burst. In contrast to stored video, live applications typically have limited knowledge of frame sizes and often require bounds on the delay between the source and the client(s). This paper addresses bandwidth smoothing

  9. The Magellanic Stream

    NASA Astrophysics Data System (ADS)

    Nidever, David L.; Majewski, S. R.; Burton, W. B.

    2010-01-01

    We have performed a detailed HI study of the Magellanic Stream (MS). Using the LAB all-sky HI survey, we expose the MS to be composed of two filaments distinct both spatially and in velocity. One of the MS filaments and parts of the Leading Arm (LA) can be traced back to their origin in the SouthEast HI Overdensity (SEHO) of the LMC, which includes 30 Doradus. Therefore, at least one-half of the trailing Stream and most of the LA originates in the LMC, contrary to previous assertions that they originate in the SMC and/or in the Magellanic Bridge. The two MS filaments show periodic spatial and velocity patterns that we speculate are an imprint of the LMC rotation curve. If true, then the drift rate of the Stream gas away from the Magellanic Clouds is 49 km/s and the age of the MS is 1.74 Gyr. High-resolution HI data of the LMC show gas outflows from supergiant shells in the SEHO that seem to be creating the LA and LMC filament of the MS. We lay out a new model, the "Blowout Hypothesis", for the formation of the MS that fits all of the available data and solves some longstanding problems. We also conducted a 200 square degree HI survey with the GBT at the tip of the MS in order to bridge the gap between the 100 deg-long "classical" MS and the MS-like emission reported by Braun & Thilker (2004). Our survey shows that the MS gas is continuous across the gap and that the MS is at least 140 deg long. A previously unknown velocity inflection in the MS-tip is also revealed in the data. We fit an orbit to the MS velocity distribution and find a robust solution for the space velocity of the MS.

  10. STREAMS IN THE URBAN LANDSCAPE

    Microsoft Academic Search

    Michael J. Paul; Judy L. Meyer

    2001-01-01

    ? Abstract The world’s population is concentrated,in urban areas. This change,in demography,has brought landscape transformations that have a number,of documented effects on stream ecosystems. The most consistent and pervasive effect is an increase in impervious surface cover within urban catchments, which alters the hydrology and geomorphology,of streams. This results in predictable changes,in stream habitat. In addition to imperviousness, runoff from

  11. Wittgenstein on Field and Stream

    E-print Network

    Daniel, Stephen H.

    WITTGENSTEIN ON FIELD AND STREAM Stephen H. Daniel The phenomena-logical description of the con­ stitution of meaningfulness and evidence often is presented (e.g., by the Husserl of the Cartesian Meditations and the Crisis) in terms of a... metaphor­ ical vocabulary of "fields," "horizons," "streams," "flows," etc. Though other phenomenological themes have been recognized in some of Wittgenstein's writings, his use of these field and stream metaphors in describ­ ing his family resemblances...

  12. Stream salamanders as indicators of stream quality in Maryland, USA

    USGS Publications Warehouse

    Southerland, M.T.; Jung, R.E.; Baxter, D.P.; Chellman, I.C.; Mercurio, G.; Volstad, J.H.

    2004-01-01

    Biological indicators are critical to the protection of small, headwater streams and the ecological values they provide. Maryland and other state monitoring programs have determined that fish indicators are ineffective in small streams, where stream salamanders may replace fish as top predators. Because of their life history, physiology, abundance, and ubiquity, stream salamanders are likely representative of biological integrity in these streams. The goal of this study was to determine whether stream salamanders are effective indicators of ecological conditions across biogeographic regions and gradients of human disturbance. During the summers of 2001 and 2002, we intensively surveyed for stream salamanders at 76 stream sites located west of the Maryland Coastal Plain, sites also monitored by the Maryland Biological Stream Survey (MBSS) and City of Gaithersburg. We found 1,584 stream salamanders, including all eight species known in Maryland, using two 15 ? 2 m transects and two 4 m2 quadrats that spanned both stream bank and channel. We performed removal sampling on transects to estimate salamander species detection probabilities, which ranged from 0.67-0.85. Stepwise regressions identified 15 of 52 non-salamander variables, representing water quality, physical habitat, land use, and biological conditions, which best predicted salamander metrics. Indicator development involved (1) identifying reference (non-degraded) and degraded sites (using percent forest, shading, riparian buffer width, aesthetic rating, and benthic macroinvertebrate and fish indices of biotic integrity); (2) testing 12 candidate salamander metrics (representing species richness and composition, abundance, species tolerance, and reproductive function) for their ability to distinguish reference from degraded sites; and (3) combining metrics into an index that effectively discriminated sites according to known stream conditions. Final indices for Highlands, Piedmont, and Non-Coastal Plain regions comprised four metrics: number of species, number of salamanders, number of intolerant salamanders, and number of adult salamanders, producing classification efficiencies between 87% and 90%. Partial validation of these indices was obtained when a test of the number of salamanders metric produced an 82% correct classification of 618 MBSS sites surveyed in 1995-97. This study supports the use of stream salamander monitoring and a composite stream salamander index of biotic integrity (SS-IBI) to determine stream quality in Maryland.

  13. The Magellanic Stream Revisited

    NASA Astrophysics Data System (ADS)

    Murai, T.

    There is still a controversy on the mass of the Galaxy in the deep halo, some still advocates a conservative view where the rotation velocity ultimately decays as in accord with the Keplerian law at the distance of 50 kpc, while others become to consider that the rotation curve of the Milky Way, essentially, stays flat or is still increasing at the distance of the Magellanic Clouds and the Magellanic Stream. On the Basis of the accurate observed data of the spacial location of the LMC, SMC and the Magellanic Stream and their radial velocity distribution, it is clarified that the halo of the Galaxy has a huge dark matter, resulting in a flat rotation curve with the terminal velocity of the order of 250 km/s. It is shown that the tidal interaction of the LMC and the SMC has produced a number of charcteristics, a series of burst of star formation, kinematic peculiarities within the both Clouds, collision-induced imprints, etc. All have, observationally, been revealed and interpreted as a result of at leased two colse encounters of the LMC and the SMC, which can occur only in the deep gravitational potential of dark matter as shown by a tidal simulation of Murai and Fujimoto(1980).

  14. The LHCb Turbo Stream

    E-print Network

    Benson, Sean

    2015-01-01

    The LHCb experiment will record an unprecedented dataset of beauty and charm hadron decays during Run II of the LHC, set to take place between 2015 and 2018. A key computing challenge is to store and process this data, which limits the maximum output rate of the LHCb trigger. So far, LHCb has written out a few kHz of events containing the full raw sub-detector data, which are passed through a full offline event reconstruction before being considered for physics analysis. Charm physics in particular is limited by trigger output rate constraints. A new streaming strategy includes the possibility to perform the physics analysis with candidates reconstructed in the trigger, thus bypassing the offline reconstruction. In the "turbo stream" the trigger will write out a compact summary of "physics" objects containing all information necessary for analyses, and this will allow an increased output rate and thus higher average efficiencies and smaller selection biases. This idea will be commissioned and developed during...

  15. The LHCb Turbo Stream

    E-print Network

    Benson, Sean; Vesterinen, Mika Anton; Williams, John Michael

    2015-01-01

    The LHCb experiment will record an unprecedented dataset of beauty and charm hadron decays during Run II of the LHC, set to take place between 2015 and 2018. A key computing challenge is to store and process this data, which limits the maximum output rate of the LHCb trigger. So far, LHCb has written out a few kHz of events containing the full raw sub-detector data, which are passed through a full offline event reconstruction before being considered for physics analysis. Charm physics in particular is limited by trigger output rate constraints. A new streaming strategy includes the possibility to perform the physics analysis with candidates reconstructed in the trigger, thus bypassing the offline reconstruction and discarding the raw event. In the Turbo stream the trigger will write out a compact summary of physics objects containing all information necessary for analyses, and this will allow an increased output rate and thus higher average efficiencies and smaller selection biases. This idea will be commissi...

  16. Healthy Living after Stroke

    MedlinePLUS

    Healthy Living After Stroke Nutrition Good nutrition is one way to reduce your risk of having another ... content was last reviewed on 04/30/2014. Healthy Living Resource Guide for All Seniors Any person ...

  17. Living with Grandparents

    MedlinePLUS

    ... Back 1 ? 2 For Teens For Kids For Parents MORE ON THIS TOPIC What Is a Divorce? Being Adopted Talking About Your Feelings Living With Stepparents What Kids Say About: Parents Living With a Single Parent Welcoming a New ...

  18. Is It Living?

    NSDL National Science Digital Library

    Francis Eberle

    2005-01-01

    The purpose of this assessment probe is to elicit students' ideas about living and nonliving things. The probe is designed to find out what attributes children focus on when considering if something is or was once living.

  19. Living with Spina Bifida

    MedlinePLUS

    ... Families About Us Information For... Media Policy Makers Living With Spina Bifida Language: English Español (Spanish) Recommend ... This section of the website provides information about living with spina bifida at different ages. Spina bifida ...

  20. 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 video—presented by the ...

  1. 1995 MARYLAND BIOLOGICAL STREAM SURVEY STREAM HABITAT ASSESSMENT (HABIT95)

    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 study area comprises eighteen drainage basins across the state of Maryland, providing ...

  2. StreamCloud: A Large Scale Data Streaming System

    Microsoft Academic Search

    Vincenzo Gulisano; Ricardo Jiménez-Peris; Marta Patiño-Martínez; Patrick Valduriez

    2010-01-01

    Data streaming has become an important paradigm for the real-time processing of continuous data flows in domains such as finance, telecommunications, networking, Some applications in these domains require to process massive data flows that current technology is unable to manage, that is, streams that, even for a single query operator, require the capacity of potentially many machines. Research efforts on

  3. 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.

  4. 1994 MARYLAND BIOLOGICAL STREAM SURVEY STREAM HABITAT ASSESSMENT (HABIT94)

    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 study area comprises eighteen drainage basins across the state of Maryland, providing ...

  5. Streaming Virtual Machine to Stanford Streaming Architecture (part 1)

    E-print Network

    Dally, William J.

    #12;March 9, 2004 3 Streams · Contiguous elements in the SRF ­ Aligned to 64 word SRF lines ­ No real code ­ Transferred from memory to SRF then to µstore ­ µstore locations "allocated" by compiler ­ PC Stream Instructions · Transfer data between memory and SRF ­ Strided ­ Indexed ­ withOp · Kernels ­ Load

  6. Stream health: incorporating the human dimension to advance stream ecology

    Microsoft Academic Search

    JUDY L. MEYER

    1997-01-01

    A healthy stream is an ecosystem that is sustainable and resilient, maintaining its eco- logical structure and function over time while continuing to meet societal needs and expectations. The concept described in this paper explicitly incorporates both ecological integrity (maintaining structure and function) and human values (what society values in the ecosystem). Stream ecologists who want their research to contribute

  7. Scientific Computing Applications on a Stream Processor

    Microsoft Academic Search

    Ying Zhang; Xuejun Yang; Guibin Wang; I. Rogers; Gen Li; Yu Deng; Xiaobo Yan

    2008-01-01

    Stream processors, developed for the stream programming model, perform well on media applications. In this paper we examine the applicability of a stream processor to scientific computing applications. Eight scientific applications, each having different performance characteristics, are mapped to a stream processor. Due to the novelty of the stream programming model, we show how to map programs in a traditional

  8. LEARNING FROM DATA STREAMS WITH CONCEPT DRIFT

    E-print Network

    Roberts, Stephen

    LEARNING FROM DATA STREAMS WITH CONCEPT DRIFT #12;#12;LEARNING FROM DATA STREAMS WITH CONCEPT DRIFT learning on data streams. An important feature of many real-world data streams is "concept dri ," whereby the characteristics of the data can change arbitrarily over time. e presence of concept dri in a data stream renders

  9. PERCENT AGRICULTURE ADJACENT TO STREAMS (FUTURE)

    EPA Science Inventory

    The type of vegetation along a stream influences the water quality in the stream. Intact buffer strips of natural vegetation along streams tend to intercept pollutants before they reach the stream. High percentages of agriculture along streams increase the likelihood of elevated ...

  10. FUTURE LOGISTICS LIVING LABORATORY

    E-print Network

    Heiser, Gernot

    FUTURE LOGISTICS LIVING LABORATORY Delivering Innovation The Future Logistics Living Lab that will provide logistics solutions for the future. The Living Lab is a demonstration, exhibition and work space of around 200 m² located at NICTA's Australian Technology Park offices in Redfern. The lab is driven

  11. 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…

  12. Recognizing Safety and Liveness

    Microsoft Academic Search

    Bowen Alpern

    1986-01-01

    This paper substantiates that experience by formalizing safety and liveness in a way that permits the relationship between safety and invariance and between liveness and wellfoundedness to be demonstrated for a large class of properties. In so doing, we give new characterizations of safety and liveness and prove that they satisfy the formal definitions in [Alpera & Schneider 85a

  13. Bioelectrodynamics in living organisms

    Microsoft Academic Search

    Shu-Ang Zhou; Mitsuru Uesaka

    2006-01-01

    This article introduces an interdisciplinary subject of bioelectrodynamics in living organisms and its related research challenges and opportunities. Bioelectrodynamics in living organisms is aimed to reveal critical roles of electromagnetism and mechanics in biology, to correlate biophysical functions of living organisms with biochemical processes at the cellular level, and to introduce theoretical basis and methodology, such as modeling and simulations,

  14. Improved P2P Streaming in Wireless Networks Utilizing Access Point P2P Agents

    Microsoft Academic Search

    Chung-Yi Lai; Chiun-Sheng Hsu; Tzyh-Jong Shang

    2007-01-01

    we see the overlay P2P network in the Internet as the In this paper, we present an improved method for media network providing video streaming for the live streaming in the wireless environment over an wireless terminal. And7 we Propose an improved overlay Peer-to-Peer (P2P) network. The key overlay P2P system that Conserves bandwidth by innovation is to pre-instalI the

  15. The Magellanic Stream

    NASA Astrophysics Data System (ADS)

    Nidever, David Lee

    We have performed a detailed HI study of the Magellanic Stream (MS). Using the LAB all-sky HI survey, we expose the MS to be composed of two filaments distinct both spatially (as first pointed out by Putman et al. 2003) and in velocity. One of the MS filaments and parts of the Leading Arm (LA) can be traced back to their origin in the SouthEast HI Overdensity (SEHO) of the LMC, which includes 30 Doradus. Therefore, at least one-half of the trailing Stream and most of the LA originates in the LMC, contrary to previous assertions that they originate in the SMC and/or in the Magellanic Bridge. The two MS filaments show periodic spatial and velocity patterns that we speculate are an imprint of the LMC rotation curve. If true, then the drift rate of the Stream gas away from the Magellanic Clouds is ˜49 km s-1 and the age of the MS is ˜1.74 Gyr. High-resolution HI data of the LMC show gas outflows from supergiant shells in the SEHO that seem to be creating the LA and LMC filament of the MS. We lay out a new model, the "Blowout Hypothesis", for the formation of the MS that fits all of the available data and solves some longstanding problems. We also conducted a ˜200 deg2 H I survey with the GBT at the tip of the MS in order to bridge the gap between the ˜100°-long "classical" MS and the MS-like emission reported by Braun & Thilker (2004). Our survey shows that the MS gas is continuous across the gap and that the MS is at least ˜140° long. A previously unknown velocity inflection in the MS-tip is also revealed in the data. The mass of the newly-found ˜40° extension of the MS-tip is ˜5x107 M? which increases the total mass of the MS by ˜10%. We estimate that the age of the ˜140°-long MS is ˜2.5 Gyr which coincides with bursts of star formation in the Magellanic Clouds and a possible close encounter of these two galaxies with each other. These new observational characteristics of the MS offer additional new constraints on MS simulations.

  16. Pierre Y. Julien Stream Rehabilitation

    E-print Network

    Julien, Pierre Y.

    to stream restoration projects. Three Laws of Stream Restoration Example Showing the Impact of Deforestation;3 Subsistence Farming Farming Hilltops? Watershed Deforestation #12;4 Peligre Dam (sedimentation) Hurricane at the geology, deforestation, land use changes, urbanization, climate and extreme events. Examine water

  17. Data Stream Processing Mengmeng Liu

    E-print Network

    Loo, Boon Thau

    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

  18. Temperature of the Gulf Stream

    NSDL National Science Digital Library

    This site Presents a MODIS (Moderate-resolution Imaging Spectroradiometer) image of the Gulf Stream. The image is color-coded to show the variation in temperature of the ocean water. A brief description of the Gulf Stream, its direction and speed, and a link to other related imagery are included.

  19. Continuous queries over data streams

    Microsoft Academic Search

    Shivnath Babu; Jennifer Widom

    2001-01-01

    In many recent applications, data may take the form of continuous data streams, rather than finite stored data sets. Several aspects of data management need to be reconsidered in the presence of data streams, offering a new research direction for the database community. In this paper we focus primarily on the problem of query processing, specifically on how to define

  20. The chalk-stream environment

    Microsoft Academic Search

    A. D. Berrie

    1992-01-01

    Chalk is a very pure and porous form of limestone. Water percolates down through the rock to form aquifers which overflow as springs forming chalk streams which receive little surface runoff. Passage through the rock is relatively slow and smooths out irregularities in rainfall and stabilises the water temperature. As a result the streams tend to have a regular annual

  1. Efficient Video-Stream Filtering

    E-print Network

    Stanchev, Peter

    Efficient Video- Stream Filtering Fabrizio Falchi, Claudio Gennaro, and Pasquale Savino Institute A new approach for video-stream filtering that makes use of the features representing video content information is deliv- ered by news agencies, broadcast TV programs,1,2 and even surveillance sys- tems, users

  2. Aesthetic Considerations for Stream Restoration

    EPA Science Inventory

    Aesthetics are an integral component of the social and economic benefits of stream restoration and should be considered in restoration projects for sustainable management. According to Bernhardt et al. (2005), aesthetics is one of the frequently listed goals for stream restoratio...

  3. STUDIES ON STREAMING

    PubMed Central

    Nachmias, Vivianne T.

    1969-01-01

    In Chaos chaos streaming, motility, and cytokinesis were inhibited nearly 100% for several hours by 2.5–5 mM sodium adenosine triphosphate (ATP)1 added to culture fluid. All three effects were completely prevented by the addition of equimolar Mg++ or Ca++ ions but not Na+ to the ATP/culture fluid solution. The effects of ATP were not reproduced by EDTA, EGTA, colchicine, or AMP. Sodium pyrophosphate produced about 50% inhibition at 5 mM. Studies with 14C-ATP showed that 5 x 10-5 to 5 x 10-4 mmole of ATP was firmly associated with each milliliter of packed cells after an hour's incubation at 24°C. Labeling studies also showed that prevention of the ATP effects by Mg++ ions was not due to a decrease in the amount of ATP associated with the cells. PMID:4302021

  4. Pacific Northwest Stream Survey

    NSDL National Science Digital Library

    2005-01-01

    The Oregon State University Libraries has created this wonderful collection of 1,000 different images taken between 1934 and 1945 that document 390 streams in the Columbia River Basin. The photographs were taken by U.S. Bureau of Fisheries researchers who were interested in the spawning and rearing habitats for spring Chinook salmon. Visitors can use the clickable map on the homepage to move around through the images, which cover areas like the Puget Sound, the Clearwater region of Idaho, and the Willamette River Valley in Oregon. Each of these separate maps has a finer level of detail, and visitors can even click on various tributaries to look for detailed images. Visitors can use the keyword search, or the geographic search, which allows them to scroll around via major river basins. The site also contains technical reports on the salmon's spawning patterns created as part of this long-term project.

  5. Stream processing health card application.

    PubMed

    Polat, Seda; Gündem, 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

  6. 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

  7. ConcepTest: Stream Profile #2

    NSDL National Science Digital Library

    The diagram below depicts the profile of a stream from its headwaters to its mouth. Which combination of variables is most likely controlling the stream velocity along the profile? a. Gradient and stream load b. ...

  8. Streaming data between Web Services: Comparison of streaming protocols over a stream-enabled Web Service

    Microsoft Academic Search

    Spyridon Koulouzis; Evangelos Angelou; Adam Belloum

    The ability to stream data between web-services could be an alternative way of data transfer in grid environments, for a number of applications. This work intents to investigate various protocols as to their suitability for streaming, taking into consideration issues such as security, reliability and speed over different Grid configurations. To perform these comparisons we have implemented a Server\\/Client library

  9. 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.

  10. Living Wage Calculator

    NSDL National Science Digital Library

    Glasmeier, Amy

    In many parts of the United States, families working in low-wage jobs make insufficient income to live locally given the high cost of living. Some of this can be due to rising real estate costs and the like and a number of organizations have worked to craft living wage legislation in a number of cities. This Living Wage calculator helps visitors estimate the cost of living in their community or region. Visitors can get started by selecting a location from the list presented here. Additionally, they can also use the search engine to look for specific places. For each place, visitors can learn about the living wage, typical expenses, and so on. It's an interesting policy tool and it can be used to teach students about economics, the job market, and much more.

  11. Fish species richness and stream order in Washington State streams

    Microsoft Academic Search

    Hal A. Beecher; Eric R. Dott; Robert F. Fernau

    1988-01-01

    Synopsis  We sampled fish at pairs of sites of the same stream order on opposite sides of drainage divides in the Cascade Mountains\\u000a and in the southwest portion of Washington state. Elevation, gradient, drainage area, and stream order were significantly\\u000a correlated with number of fish species collected at a site. Elevation accounted for the greatest portion of the variation\\u000a in number

  12. Lives, the Biography Resource

    NSDL National Science Digital Library

    Lives, the Biography Resource, is a comprehensive guide to more than one thousand biographical information resources available on the Web. The briefly annotated guide indexes resources by individual names and also organizes resources into several collections, which collocate related resources according to subject, region, era, profession, etc. In addition, the guide includes Inside Lives, a section that features new and noteworthy sites covering biographies, autobiographies, memoirs, oral histories, personal papers, and more. Lives is updated weekly.

  13. Living Phenomena and Living Information : Centered on Living Structure and Design

    NASA Astrophysics Data System (ADS)

    Shizuno, Tomofumi

    The term ‘living’ has manifold meanings. The author interprets it in three reasonable ways : 1) sustaining one's life, 2) surviving under economic surroundings, 3) existing socially. Centered on ‘living structure’ which grasps static aspects of living and ‘living design’ which does dynamic aspects of living he investigates living phenomena and discusses their relationship to living information. The author also catches living phenomena from viewpoints as follows : 1) people, 2) corporation, 3) researcher, 4) administration, and investigates living information from the four viewpoints as above. The examples of classification for living itself as well as for living information are shown.

  14. Living Things and Where They Live

    NSDL National Science Digital Library

    Houghton Mifflin Science

    This self-contained module on living things and their habitats includes a range of fun activities that students can perform in the classroom and at home with family members. They impart important concepts such as observation, identification, measurement, and differentiation.

  15. MODELING PLUMES IN SMALL STREAMS

    EPA Science Inventory

    Pesticides accumulate on land surfaces from agricultural, commercial, and domestic application, and wash into streams and rivers during dry and wet weather. Flood water retention basins or structures often collect this contaminated runoff, providing intermediate storage and limit...

  16. Stanford Streaming Supercomputer Massimiliano Fatica

    E-print Network

    Dally, William J.

    ,vol,STREAM_GROUP_HALO,2,2,2); //Apply restriction operator to generate stream with (AA,AA,AA,AA) TransferFieldFineCoarse(local_flow82, a FORTRAN code written by Prof. Jameson, for the solution of the inviscid flow around an airfoil Supercomputer. The structure of the code is similar to TFLO and the algorithm is found in many compressible flow

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

    Microsoft Academic Search

    K. L. Prestegaard; M. O'Connell

    2004-01-01

    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

  18. Classifying Evolving Data Streams for Intrusion Detection

    Microsoft Academic Search

    Mohammad M. Masud; Jing Gao; Latifur Khan; Jiawei Han

    Stream data classification is a challenging problem because of two important properties: its infinite length and evolving nature. Traditional learning algorithms that require several passes on the training data are not directly applicable to stream classification problem because of the infinite length of the data stream. Data streams may evolve in several ways: the prior probability distribution p(c) of a

  19. THE DYNAMICS OF STAR STREAM GAPS

    SciTech Connect

    Carlberg, R. G., E-mail: carlberg@astro.utoronto.ca [Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4 (Canada)

    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.

  20. Efficient Evaluation of XQuery over Streaming Data

    Microsoft Academic Search

    Xiaogang Li; Gagan Agrawal

    2005-01-01

    With the growing popularity of XML and emergence of streaming data model, processing queries over streaming XML has become an important topic. This paper presents a new framework and a set of techniques for processing XQuery over streaming data. As compared to the existing work on supporting XPath\\/XQuery over data streams, we make the following three contributions:1. We propose a

  1. Towards Streaming Media Traffic Monitoring and Analysis

    Microsoft Academic Search

    Hun-Jeong Kang; Hong-Taek Ju; Myung-Sup Kim; James W. Hong

    Recently, a significant increase in streaming media traffic has occurred. This trend is fueled by a large number of Internet users, high bandwidth connections, and improved performance in PCs. It is important to monitor and analyze streaming media traffic. But most enterprises and ISPs cannot obtain exact information about streaming media traffic. Because the majority of streaming media applications use

  2. Prediction of Stream Temperature in Forested Watersheds

    Microsoft Academic Search

    V. Sridhar; Amy L. Sansone; Jonathan Lamarche; Tony Dubin; Dennis P. Lettenmaier

    2004-01-01

    Removal of streamside vegetation changes the energy balance of a stream, and hence its temperature. A common approach to mitigating the effects of logging on stream temperature is to require establishment of buffer zones along stream corridors. A simple energy balance model is described for prediction of stream temperature in forested headwater watersheds that allows evaluation of the performance of

  3. Approximate join processing over data streams

    Microsoft Academic Search

    Abhinandan Das; Johannes Gehrke; Mirek Riedewald

    2003-01-01

    We consider the problem of approximating sliding window joins over data streams in a data stream processing system with limited resources. In our model, we deal with resource constraints by shedding load in the form of dropping tuples from the data streams. We first discuss alternate architectural models for data stream join processing, and we survey suitable measures for the

  4. Sketching Sampled Data Streams Florin Rusu1

    E-print Network

    Rusu, Florin

    Sketching Sampled Data Streams Florin Rusu1 , Alin Dobra2 CISE Department University of Florida for data streams and they proved to be useful for estimating frequency moments and aggregates over joins of the stream rather than the entire data stream. In this paper we analyze the behavior of the sketch estimator

  5. Where You Live Matters

    MedlinePLUS

    ... is not. Where You Live Matters Is your home, community and state well-suited for aging/long-term care? Expand Staying in Your Home ... steps can I take to stay in my home? What are my options for living in an aging-oriented facility? LTC PathFinder Long-term care is ...

  6. Empathetic living media

    Microsoft Academic Search

    Adrian David Cheok; Roger Thomas Kok; Chuen Tan; Owen Noel Newton Fernando; Tim Merritt; Janyn Yen Ping Sen

    2008-01-01

    We describe a new form of interactive living media used to communicate social or ecological information in the form of an empathetic ambient media. In the fast paced modern world people are generally too busy to monitor various significant social or human aspects of their lives, such as time spent with their family, their overall health, state of the ecology,

  7. Molecules in Living Systems

    NSDL National Science Digital Library

    2012-06-19

    This lesson explains the difference between molecules in living systems and inanimate objects. In living systems, atoms and molecules are organized to a much greater degree and provide the structure of the organism. Lipids, carbohydrates, proteins, and nucleic acids are also discussed.

  8. Living History of Physiology

    NSDL National Science Digital Library

    2009-07-01

    The APS is pleased to announce the launch of the Living History of Physiology Project. The Society encourages the membership to consider interviewing senior physiologists at their institutions to provide a living history of physiology. The videos provided to date focus on the physiologistÂ?s training and career and their professional interactions.

  9. 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…

  10. DynaStream: Adaptive Overlay Management for Peer-to-Peer Video Streaming

    E-print Network

    Ramachandran, Umakishore

    , they have not paid careful attention to the impact of the number of data streams on streaming quality. In this paper, we first explore the effect of the choice of the number of data streams to the streaming quality node to make an entirely local decision to adaptively control the right number of data streams

  11. Abstract--Multimedia systems must deal with multiple data streams. Each data stream usually contains

    E-print Network

    1 Abstract-- Multimedia systems must deal with multiple data streams. Each data stream usually to focus the computing resources on a relevant subset of data streams at any given time instant and use streams. In this paper, we generalize our experiential sampling framework to multiple data streams

  12. Condensative Stream Query Language for Data Streams Lisha Ma1 Werner Nutt2 Hamish Taylor1

    E-print Network

    Taylor, Hamish

    Condensative Stream Query Language for Data Streams Lisha Ma1 Werner Nutt2 Hamish Taylor1 1 School for declarative query languages over data streams do not support such condensative pro- cessing. Nor is it yet and efficient in practice. Keywords: Data Stream, Stream Query Language, Window Aggregation, Sequence Model

  13. 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)

  14. Using Impinging Stream to Kill Algae, Fungi and Bacteria in Cooling Water of Thermal Power Plants

    Microsoft Academic Search

    Xia Yang; Jia Guo; Yu-xin Zhou; Yuan Wu; Hong-qiang Zhang; Lin Zhang

    2011-01-01

    The growth of living organism like algae, fungi and bacteria in the cooling-water system of thermal power plants may cause biological fouling. In this paper, a novel method using impinging stream was proposed to kill algae, fungi and bacteria in cooling water of thermal power plants. Using yeast cells as an example, the method of yeast cell disruption by a

  15. Engineering living functional materials.

    PubMed

    Chen, Allen Y; Zhong, Chao; Lu, Timothy K

    2015-01-16

    Natural materials, such as bone, integrate living cells composed of organic molecules together with inorganic components. This enables combinations of functionalities, such as mechanical strength and the ability to regenerate and remodel, which are not present in existing synthetic materials. Taking a cue from nature, we propose that engineered 'living functional materials' and 'living materials synthesis platforms' that incorporate both living systems and inorganic components could transform the performance and the manufacturing of materials. As a proof-of-concept, we recently demonstrated that synthetic gene circuits in Escherichia coli enabled biofilms to be both a functional material in its own right and a materials-synthesis platform. To demonstrate the former, we engineered E. coli biofilms into a chemical-inducer-responsive electrical switch. To demonstrate the latter, we engineered E. coli biofilms to dynamically organize biotic-abiotic materials across multiple length scales, template gold nanorods, gold nanowires, and metal/semiconductor heterostructures, and synthesize semiconductor nanoparticles (Chen, A. Y. et al. (2014) Synthesis and patterning of tunable multiscale materials with engineered cells. Nat. Mater. 13, 515-523.). Thus, tools from synthetic biology, such as those for artificial gene regulation, can be used to engineer the spatiotemporal characteristics of living systems and to interface living systems with inorganic materials. Such hybrids can possess novel properties enabled by living cells while retaining desirable functionalities of inorganic systems. These systems, as living functional materials and as living materials foundries, would provide a radically different paradigm of materials performance and synthesis-materials possessing multifunctional, self-healing, adaptable, and evolvable properties that are created and organized in a distributed, bottom-up, autonomously assembled, and environmentally sustainable manner. PMID:25592034

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

    PubMed Central

    Wolff, K.; Marenduzzo, D.; 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. PMID:22337633

  17. Implementation of Live Video Transmission in MPEG4 3D Scene

    Microsoft Academic Search

    Wen-hao Wang; Chieh-chih Chang; Ming-fen Lin

    2002-01-01

    This paper discusses the implementation of live video transmission in MPEG-4 3D scene. A captured video stream is packetized\\u000a and time-stamped in MPEG-4 synchronization layer (SL) and transmitted on the channel created by DMIF remote instance. The\\u000a primary method is to parse the MP4 file and utilize the characteristics of elementary stream (ES) descriptor. The SL configuration\\u000a and SL header

  18. The StreamIt development tool : a programming environment for StreamIt

    E-print Network

    Kuo, Kimberly Sue, 1981-

    2004-01-01

    StreamIt [28] is a high-level programming language intended for the development of large-scale and high-performance streaming applications that are characterized by the processing of data streams by modular structures. The ...

  19. 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.

  20. Fish populations in Plynlimon streams

    NASA Astrophysics Data System (ADS)

    Crisp, D. T.; Beaumont, W. R. C.

    In Plynlimon streams, brown trout (Salmo trutta L.) are widespread in the upper Wye at population densities of 0.03 to 0.32 fish m-2 and show evidence of successful recruitment in most years. In the upper Severn, brown trout are found only in an area of c. 1670 -2 downstream of Blaenhafren Falls at densities of 0.03 to 0.24 fish -2 and the evidence suggests very variable year to year success in recruitment (Crisp & Beaumont, 1996). Analyses of the data show that temperature differences between afforested and unafforested streams may affect the rates of trout incubation and growth but are not likely to influence species survival. Simple analyses of stream discharge data suggest, but do not prove, that good years for recruitment in the Hafren population were years of low stream discharge. This may be linked to groundwater inputs detected in other studies in this stream. More research is needed to explain the survival of the apparently isolated trout population in the Hafren.

  1. Assisted Living Community Profile

    MedlinePLUS

    ... services; Supervise person with cognitive disabilities; Social and religious activities; Arrangements for transportation; Laundry and linen service; ... NCAL Gazette Resources & Publications Assisted Living Studies Clinical Practice Guidelines Consumer Resources Health Information Technology In-Service ...

  2. Mercury: Where You Live

    MedlinePLUS

    ... for... Businesses Consumers Health Care Providers Parents Schools Mercury can be found most anywhere. On this page, you will find resources about mercury where you live - your home and community, your ...

  3. Living with Pulmonary Embolism

    MedlinePLUS

    ... on Twitter. Living With Pulmonary Embolism Pulmonary embolism (PE) usually is treated in a hospital. After leaving ... you're taking medicine. Medicines used to treat PE can thin your blood too much. This can ...

  4. Live Science: Technology

    NSDL National Science Digital Library

    This website, created by Live Science, provides current information on what is happening in technology. The site features videos and textual information on broad technical topics, including electronics, robotics, energy, aeronautics and much more.

  5. Living and Nonliving

    NSDL National Science Digital Library

    WGBH Educational Foundation

    2003-09-26

    What is it that distinguishes a living organism from a nonliving object? This collection of images presents examples that aren't as clear-cut as one might think, enticing students to question the meaning of life.

  6. Living with Prostate Cancer

    MedlinePLUS

    ... eating and maintaining an active lifestyle after a prostate cancer diagnosis can lower the chances of the cancer coming ... cardiovascular fitness, and depression. Physical activity after a prostate cancer diagnosis is linked to living longer and a reduced ...

  7. Living with Heart Disease

    MedlinePLUS

    ... page from the NHLBI on Twitter. Living With Heart Disease If you have coronary heart disease (CHD), ... it harder for you to make lifestyle changes. Heart Attack Warning Signs If you have CHD, learn ...

  8. Living with Fanconi Anemia

    MedlinePLUS

    ... from the NHLBI on Twitter. Living With Fanconi Anemia Improvements in blood and marrow stem cell transplants ... Rate This Content: NEXT >> November 1, 2011 Fanconi Anemia Clinical Trials Clinical trials are research studies that ...

  9. Living with Anemia

    MedlinePLUS

    ... page from the NHLBI on Twitter. Living With Anemia Often, you can treat and control anemia. If ... by an inherited or chronic disease or trauma. Anemia and Children/Teens Infants and young children have ...

  10. 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.

  11. Living with Oxygen Therapy

    MedlinePLUS

    ... page from the NHLBI on Twitter. Living With Oxygen Therapy Oxygen therapy helps many people function better and be ... chronic obstructive pulmonary disease) Although you may need oxygen therapy continuously or for long periods, it doesn' ...

  12. 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 ...

  13. Stream Dynamics and the Urban Environment

    NSDL National Science Digital Library

    Anne Hall

    This field activity focuses on stream dynamics and urban development. The field site is a local, wadeable urban stream and the activity, including transportation, can be completed during a 3-hour lab session. At the field site, a sketch of the stream reach is drafted by each student. This sketch includes a visual representation of the stream channel and banks as well as written observations, such as the amount of riparian vegetation, evidence of erosion and type of stream sediment. In small groups, students then determine stream velocity and cross-sectional area at the site, and calculate stream discharge (Q= velocity x cross-sectional area). In the field, there is discussion of the causes of changes in stream discharge (change in input/output), the relationship between the factors in the stream discharge equation (channel dimensions, velocity) and the effects of urban development on streams. After the field trip, given a topographic map of the area, students delineate the stream's watershed boundary. Students analyze the satellite image of the watershed to determine land use patterns. Students use online USGS data to draft a storm hydrograph and determine lag time for this stream after a rain event (video and photos of this stream at normal and flood stage are posted on the class website). The students also compare data from a stream in a nearby national forest during a similar storm event, noting differences in the storm hydrograph and lag time.

  14. Living and Fossil Macrocyprididae

    E-print Network

    Maddocks, R. F.

    1990-02-27

    that resisted wetting, dirt, and cracks or other flaws, especially in the older type specimens. Adhering epidermis and uncalcified inner lamella also are visible in many photo- graphs of live specimens. These unretouched photographs were printed at standard... that resisted wetting, dirt, and cracks or other flaws, especially in the older type specimens. Adhering epidermis and uncalcified inner lamella also are visible in many photo- graphs of live specimens. These unretouched photographs were printed at standard...

  15. Assisted Living State Regulatory Review

    MedlinePLUS

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

  16. Cosmological Two-stream Instability

    E-print Network

    G. L. Comer; Patrick Peter; N. Andersson

    2012-08-27

    Two-stream instability requires, essentially, two things to operate: a relative flow between two fluids and some type of interaction between them. In this letter we provide the first demonstration that this mechanism may be active in a cosmological context. Building on a recently developed formalism for cosmological models with two, interpenetrating fluids with a relative flow between them, we show that two-stream instability may be triggered during the transition from one fluid domination to the other. We also demonstrate that the cosmological expansion eventually shuts down the instability by driving to zero the relativeflow and the coupling between the two fluids.

  17. 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.

  18. Scientific Discovery Within Data Streams

    Microsoft Academic Search

    Andrew J. Cowell; Susan Havre; Richard May; Antonio Sanfilippo

    2004-01-01

    \\u000a The term ‘data-stream’ is an increasingly overloaded expression. It often means different things to different people, depending\\u000a on domain, usage or operation. Harold (2003) draws the following analogy:\\u000a \\u000a \\u000a \\u000a “A [stream] analogy might be a queue of people waiting to get on a ride at an amusement park. As people are processed at the\\u000a front (i.e. get on the roller coaster)

  19. Living Things and their Habitats

    NSDL National Science Digital Library

    Mrs. D.

    2006-10-11

    Students will learn how to tell the difference between living and non-living organisms and their habitats. Our class has just learned about living things and their habitats. Use this webquest to create your own living things and their habitats. Remember a living thing: Grows Moves Reproduces A Habitat is a place (home) for living things. A habitat provides four important things: 1. Food 2. Shelter 3. Space 4. Water Now you get to decide ...

  20. 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.

  1. Stream Profiles, An Environmental Investigation.

    ERIC Educational Resources Information Center

    National Wildlife Federation, Washington, DC.

    This environmental unit is one of a series designed for integration within an existing curriculum. The unit is self-contained and requires minimal teacher preparation. The philosophy of the units is based on an experience-oriented process that encourages self-paced independent student work. In this unit, students construct a stream profile based…

  2. Watershed Analysis of Stream Morphology

    NSDL National Science Digital Library

    Holly Dolliver

    The goal of this activity is to provide students an opportunity to analyze the stream pattern and morphometric relationships of a particular watershed. Students will use topographic map analysis and data collection, along with analysis of data using Excel to characterize their watershed. Designed for a geomorphology course

  3. MPEG streaming over mobile Internet

    NASA Astrophysics Data System (ADS)

    Lee, Myungjin; Lee, Kyounghee; Thang, Truong C.; Thanh, Nguyen N.; Kim, MyungChul; Ro, Yong M.; Lee, Jong H.

    2002-04-01

    MPEG streaming over Mobile Internet leads to degradation of MPEG video quality. When a handoff of a mobile node (MN) occurs, it is quite difficult to guarantee seamless video quality due to the change of routing path towards the MN. In this paper, we propose a new scheme, MPEG streaming over Concatenation and Optimization for Reservation Path (CORP), to guarantee QoS of MPEG streaming service in the Mobile Internet. When a handoff of a MN occurs, the CORP extends the existing reservation path, which was established using RSVP between a server and a MN, to a new Base Station (BS) that the MN currently connected to, instead of making a new RSVP session between the server and the MN. To demonstrate practicality of the proposed scheme, we built a prototype system which provides the MPEG-1 Video and Audio on demand over Mobile Internet using Mobile IP and IEEE 802.11b wireless LAN. Our experiment shows that the proposed scheme significantly improves the peak signal-to-noise rate (PSNR) of MPEG streaming video. Also, we analyzed the video quality of our scheme with respect to TCP and UDP transport protocols.

  4. Stream velocity Investigation using Inquiry

    NSDL National Science Digital Library

    This activity is a field investigation using science inquiry and problem solving, where small groups of students design their own experiment to determine stream velocity, collect and analyze their data, draw conclusions, and make further inferences based group discussion/collaboration.

  5. 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)

  6. Fault Analysis of Stream Ciphers

    Microsoft Academic Search

    Jonathan J. Hoch; Adi Shamir

    2004-01-01

    A fault attack is a powerful cryptanalytic tool which can be applied to many types of cryptosystems which are not vulnerable to direct attacks. The research literature contains many examples of fault attacks on public key cryptosystems and block ciphers, but surprisingly we could not find any systematic study of the applicability of fault attacks to stream ciphers. Our goal

  7. Detecting Change in Data Streams

    Microsoft Academic Search

    Daniel Kifer; Shai Ben-david; Johannes Gehrke

    2004-01-01

    Detecting changes in a data stream is an im- portant area of research with many appli- cations. In this paper, we present a novel method for the detection and estimation of change. In addition to providing statisti- cal guarantees on the reliability of detected changes, our method also provides meaning- ful descriptions and quantification of these changes. Our approach assumes

  8. 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 ...

  9. 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...

  10. 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)

  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. ConcepTest: Stream Discharge Gauges #2

    NSDL National Science Digital Library

    Four stream gauging station locations are shown on the adjacent map (A, B, C, D). Assume the bedrock and topography is similar for each stream system. Predict which station is most likely to record the least ...

  13. ConcepTest: Stream Discharge Gauges #1

    NSDL National Science Digital Library

    Four stream gauging station locations are shown on the adjacent map (A, B, C, D). Assume the bedrock and topography is similar for each stream system. Predict which station will record the greatest discharge? a. A ...

  14. 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 ...

  15. Removal of hydrogen sulfide from gas streams

    SciTech Connect

    Toms, D.J.

    1983-10-03

    Hydrogen sulfide is removed from a gas stream by contacting the gas stream with an aqueous alkanolamine solution in a high surface area rotor. The solution is subjected to an acceleration greater than that due to gravity. 16 claims.

  16. 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 ...

  17. 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 Glinšica 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.

  18. 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)

  19. The Reconfigurable Streaming Vector Processor (RSVPTM)

    Microsoft Academic Search

    Silviu Ciricescu; Ray Essick; Brian Lucas; Phil May; Kent Moat; Jim Norris; Michael A. Schuette; Ali Saidi

    2003-01-01

    The need to process multimedia data places largecomputational demands on portable\\/embedded devices.These multimedia functions share commoncharacteristics: they are computationally intensive anddata-streaming, performing the same operation(s) onmany data elements.The Reconfigurable StreamingVector Processor (RSVPTM) is a vector coprocessorarchitecture that accelerates streaming data operations.Programming the RSVP architecture involves describingthe shape and location of vector streams in memory anddescribing computations as data-flow graphs.Thesedescriptions are

  20. Living in Europe

    NSDL National Science Digital Library

    Weblogs on just about every topic imaginable (including a few which no one would have imagined) are now available. And, after some time spent living in the shadows of traditional formats such as television and mainstream periodicals, they have garnered the attention of major media programs. One of the more interesting weblog sites out there is Living in Europe, which consists of a cooperative of bloggers and writers who contribute essays, photographs, personal diaries, and news items from Europe. The perspectives section of the site offers some commentaries on the expansion of the European Union and a diary of a foreigner living in Turkey. The photos section features contributions from various parts of Europe, including some musings and photos from Catalonia and Bristol. Visitors who develop a penchant for the site may sign up to help with the administration of the site, or just offer their own commentaries on life in Europe.

  1. Living in the question.

    PubMed

    Flower, J

    1999-01-01

    We live in a fast moving-world. Business has accelerated to breathtaking speeds in the 1990s--and in the last few years the afterburner has really kicked in. The speed of change is overwhelming. Especially in health care, who has time to "live in the question?" We need to decide things quickly, get the decision out of the way, and move on, right? Maybe. Biology shows us that you can't plan ahead very far. New things come along that you don't even have a category for, and therefore you don't even see them. Things are going to happen that you literally have no notion are even possible. The key to succeeding in this environment? Don't plan ahead. Stay curious. Make small bets. Build organizational hothouses. Feed the seedlings that grow. The challenge is to remain curious, to live in the question, both personally and organizationally. PMID:10557490

  2. 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.

  3. Calit2: Live Webcasts

    NSDL National Science Digital Library

    The California Institute for Telecommunications and Information Technology (Calit2) conducts research on the scientific and technological components needed to "extend the reach of the Internet throughout the physical world." (See also report on Mathematics, Engineering and Technology, March 15, 2002) This section of the Institute website features live webcasts and video footage of guest speakers who visited the Institute. Topics range from robot design to Internet plagues, and from Telematics to the Internet marketplace. Upcoming live webcasts for May 2005 will address Non-Magnetic Data Storage Principles, Potential and Problems; Quantum Codes: Constructions and Parameters; and Biotechnology Entrepreneurship.

  4. Where Do You Live?

    NSDL National Science Digital Library

    Mrs. Kunz

    2010-03-26

    Students will choose an animal to "become." They will then decided which biome would be the best place to live, who their neighbors are, and what they will eat. Students will successfully complete a report or short story incorporating the information they have learned. Introduction If you were an Utah animal, what would you be? A blue herring? a mule deer? a fox? TASK You will choose and pretend to be a Utah animal and decide which habitat in our state you would most likely enjoy living. You will be writing a report or ...

  5. Effect of Stream Impoundment in Tennessee on the Fish Populations of Tributary Streams

    Microsoft Academic Search

    C. E. Ruhr

    1957-01-01

    Data from a statewide survey of warm water streams in Tennessee were used to determine the extent to which gizzard shad (Dorosoma cepedianum), carp (Cyprinus carpio), smallmouth buffalo (Ictiobus bubalus), and drum (Aplodinotus grunniens) inhabit smallmouth bass-rock bass streams. Reproduction of those species in tributary streams was minor or absent. By comparing samples from streams that were accessible from an

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

    Microsoft Academic Search

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

    2009-01-01

    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 Laboratory's Outdoor StreamLab, including, 1)

  7. StreamGlobe: Processing and Sharing Data Streams in Grid-Based P2P Infrastructures

    E-print Network

    Kemper, Alfons

    StreamGlobe: Processing and Sharing Data Streams in Grid-Based P2P Infrastructures Richard firstname.lastname @in.tum.de 1 Introduction and Motivation Data stream processing is currently gaining increasingly imprac- tical. Hence, in such e-science scenarios, processing and sharing of data streams

  8. Towards the Stream Analysis Model in Grid-based Zero-Latency Data Stream Warehouse

    E-print Network

    Towards the Stream Analysis Model in Grid-based Zero-Latency Data Stream Warehouse Tho Manh Nguyen advanced analysis over fast and huge data streams to capture trends, patterns, and exceptions be- come crucial. However, fully extracting the latent knowledge within the data stream is a challenging task

  9. 300 Area radioactive liquid waste streams disposal

    Microsoft Academic Search

    Clukey

    1954-01-01

    In the 300 Area there are three liquid waste streams containing low concentrations of radioactive material which are discharged into the ground. One of these is the process sewer stream from the Metal Preparations facility, the 321 Building Cold Separations Laboratory, and miscellaneous buildings where minor radioactive contamination might occur. The second stream is liquid waste of low or negligible

  10. TCP Vegas Performance with Streaming Media

    Microsoft Academic Search

    Sean D. Boyden; Anirban Mahanti; Carey L. Williamson

    2007-01-01

    In this paper we study the use of TCP Vegas as a trans- port protocol for streaming media. We also consider TCP NewReno as a transport protocol for streaming media. We find that: 1) TCP is able to transport streaming media with good performance in a wide variety of scenarios; 2) TCP Vegas performs better than TCP NewReno in many

  11. Double ion streams in the solar wind

    Microsoft Academic Search

    W. C. Feldman; J. R. Asbridge; S. J. Bame; M. D. Montgomery

    1973-01-01

    Distinct interpenetrating ion streams have been identified in the solar wind for the first time. They are shown to be interplanetary in origin and to be associated with the filling in of regions of density rarefactions accompanying high-velocity streams. With few excep- tions, the ion stream with the lower-energy density flux has higher energy. Furthermore, nonradial magnetic field directions seem

  12. Stream detritus dynamics: Regulation by invertebrate consumers

    Microsoft Academic Search

    J. Bruce Wallace; Jackson R. Webster; Thomas F. Cuffney

    1982-01-01

    Insecticide treatment of a small, Appalachian forest stream caused massive downstream insect drift and reduced aquatic insect densities to <10% of an adjacent untreated reference stream. Reduction in breakdown rates of leaf detritus was accompanied by differences in quantity and composition of benthic organic matter between the two streams. Following treatment, transport of particulate organic matter was significantly lower in

  13. AIFSP: An Adaptive Instruction Flow Stream Processor

    Microsoft Academic Search

    Yaohua Wang; Shuming Chen; Jianghua Wan; Kai Zhang; Shenggang Chen

    2011-01-01

    Stream processor is efficient for media applications as it exploits the features of media processing, such as data parallelism, producer-consumer locality and so on. However, the loosely coupled structure between host and stream processor makes the communication between scalar and SIMD part costly and scheduling across kernels less flexible. Besides, the kernel loading time adds additional cost. When the stream

  14. Network Characteristics of Video Streaming Traffic

    Microsoft Academic Search

    Ashwin Rao; Yeon-Sup Lim; Chadi Barakat; Arnaud Legout; Don Towsley; Walid Dabbous

    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

  15. Hydrology of Channelized and Natural Headwater Streams

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Understanding hydrology is paramount for optimal ecologic function and management of headwater streams. The objective of this study was to characterize and compare headwater streams within the Upper Big Walnut Creek watershed in Ohio. Two channelized and two unchannelized streams were instrumented w...

  16. Data stream management and mining Georges HEBRAIL

    E-print Network

    Paris-Sud XI, Université de

    Data stream management and mining Georges HEBRAIL TELECOM ParisTech, CNRS LTCI Paris, France Abstract. This paper provides an introduction to the field of data stream management and mining. These approaches cover both querying and mining data. Keywords. Data processing, data streams, querying data

  17. 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…

  18. CLOUD-BASED DATA STREAM PROCESSING

    E-print Network

    Tucci, Sara

    CLOUD-BASED DATA STREAM PROCESSING Thomas Heinze, Leonardo Aniello, Leonardo Querzoni, Zbigniew Jerzak DEBS 2014 Mumbai 26/5/2014 #12;TUTORIAL GOALS Data stream processing (DSP) was in the past 25/05/14 CLoud-Based Data Stream Processing #12;TUTORIAL GOALS Here we present an overview about

  19. An Information Divergence Estimation over Data Streams

    E-print Network

    Paris-Sud XI, Université de

    An Information Divergence Estimation over Data Streams Emmanuelle Anceaume IRISA / CNRS Rennes-Leibler divergence has never been analyzed before. Keywords-Data stream; divergence; randomized approxima- tion algorithm, AnKLe [1], in estimating the similarity between an observed data stream and the expected (i

  20. Systolic Opportunities for Multidimensional Data Streams

    E-print Network

    Wills, Scott

    Systolic Opportunities for Multidimensional Data Streams Sek M. Chai, Member, IEEE, and D. Scott architecture to exploit the physical data locality of planar data streams by processing data where it falls to handle planar data streams and to systematically design arrays with area I/O. Simulation results show

  1. Flexible time management in data stream systems

    Microsoft Academic Search

    Utkarsh Srivastava; Jennifer Widom

    2004-01-01

    Continuous queries in a Data Stream Management System (DSMS) rely on time as a basis for windows on streams and for defining a consistent semantics for multiple streams and updatable relations. The system clock in a centralized DSMS provides a convenient and well-behaved notion of time, but often it is more appropriate for a DSMS application to define its own

  2. Sulfur hexafluoride gas tracer studies in streams

    Microsoft Academic Search

    David E. Hibbs; J. S. Gulliver; K. L. Parkhill

    1998-01-01

    Gas tracers are useful investigative tools in the study of reaeration and the fate of volatile organic contaminants in many natural streams. They enable the direct measurement of a variety of stream parameters, including the gas exchange rates between the stream and the atmosphere, as well as the spreading rate for dissolved pollutants downstream of a discharge point or spill

  3. A CORBA framework for multimedia streams

    Microsoft Academic Search

    Damian McGrath; Martin Chapman

    1997-01-01

    The paper describes a CORBA based framework for the control and management of multimedia streams. The concepts of streams and flows are introduced, along with the abstractions used for multimedia devices. Examples of usage for point to point and point to multipoint streams are given. The OMG specification describes two profiles for implementers of the framework, a light profile and

  4. A hybrid static/dynamic approach to scheduling stream programs

    E-print Network

    Tan, Ceryen (Ceryen C.)

    2009-01-01

    Streaming languages such as Streamlt are often utilized to write stream programs that execute on multicore processors. Stream programs consist of actors that operate on streams of data. To execute on multiple cores, actors ...

  5. Streaming Potentials in Reservoir Conditions

    NASA Astrophysics Data System (ADS)

    Saunders, Jon; Jackson, Matthew; Gulamali, Murtaza

    2010-05-01

    Recent work has shown that streaming potentials measured downhole may be used to identify and characterise fluids moving through the subsurface. Of particular interest is the identification of approaching water during hydrocarbon production and the use of control strategies in response to these measurements in order to improve production efficiency and reduce the quantity of water brought to surface. Such technologies could improve overall recovery, reduce the cost of production in terms of both energy and time and also reduce the immediate impact of production on the environment. A number of important factors have been identified which have an influence on the viability and facility of the method, principally relating to the nature of the streaming potential coupling coefficient which relates the fluid potentials to electrical potentials. Here we examine the the behaviour of the streaming potential coupling coefficient under multiphase conditions, and under conditions of varying temperature and salinity. Using new insights into the pore-scale distribution of fluids and of electrical charge, we look at the saturation dependence of the streaming potential coupling coefficient, and the variation in the resulting measured potentials in a range of models with differing viscosity regimes. The saturation-dependence of the coupling coefficient is found to be important in determining the resulting streaming potential, in the case where water and oil viscosities are equal and the water front is sharpest as well as in cases with higher oil viscosities and more smoothed out water fronts. The most physically plausible models for the saturation-dependence of the coupling coefficient have the highest values of the relative coupling coefficient at intermediate saturations, and give rise to the largest measured potentials. This is a result of the rarefaction of the water front as it travels through the reservoir, meaning that the saturation fraction at the front is significantly less than 1. The coupling coefficient is composed of four independent physical parameters and it is through examination of each of these in turn that we build an understanding of the behaviour of the coupling coefficient as a whole under conditions of varying temperature and brine salinity. It is well known that the coupling coefficient (usually) decreases in magnitude with increasing salinity but the effect of temperature is less well understood. By combining the two we can begin to understand how streaming potentials may behave in reservoir conditions. While the zeta potential, dielectric permittivity, conductivity and in particular the fluid viscosity are found to vary with temperature, the overall effect on the coupling coefficient is small, showing about a 10% change between 25 and 75oC, depending on the salinity. This is reflected in the magnitude of signals predicted at the wells during production, where increasing salinity reduces the streaming potential, while increasing temperature has only a small effect. High salinities, high temperatures and the nature of the saturation-dependent coupling coefficient are among several factors which have previously been seen as obstacles to the viability of using streaming potential methods downhole during hydrocarbon recovery. Here we show that even at high salinity signals remain measurable above the expected noise, that temperature has only a small effect on the measured streaming potential magnitude and that we may expect larger signals than previously thought given a better understanding of the pore-scale physics. Removing these obstacles is a significant step forward in the development of the downhole monitoring method.

  6. StreamIt: A Language for Streaming Applications

    Microsoft Academic Search

    William Thies; Michal Karczmarek; Saman P. Amarasinghe

    2002-01-01

    Wecharacterizehigh-performancestreamingapplicationsas a new and distinct domain of programs that is becoming increasingly important. The StreaMIT language provides novelhigh-levelrepresentationstoimproveprogrammerpro- ductivity andprogramrobustnesswithinthestreaming do- main. Atthesametime,theStreaMITcompileraimstoim- provetheperformanceofstreamingapplicationsviastream- speciflcanalysesandoptimizations. Inthispaper,wemoti- vate,describeandjustifythelanguagefeaturesofStreaMIT, which include: a structured model of streams, a messaging systemforcontrol,are-initializationmechanism,andanat- ural textual syntax. We also present a means of reasoning about time in terms of \\\\information ?ow\\

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

    SciTech Connect

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

    2014-12-01

    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.

  8. Live Science: Robots

    NSDL National Science Digital Library

    This website from Live Science looks at developments in robotics. The site includes interactive features, images, multimedia and news items. Teachers interested in beginning a unit on robotics will find many useful resources on the site to use as a starting point.

  9. 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…

  10. Living in Space

    NSDL National Science Digital Library

    NASA

    2007-12-12

    NASA's Living in Space Web site allows kids of all ages the opportunity to learn how astronauts cope with zero gravity conditions in space. Everything from eating, dressing, working, and having fun is explained through descriptions, photographs, movies, audio files, and more.

  11. Moab's Living Room

    ERIC Educational Resources Information Center

    Berry, John N., III

    2007-01-01

    This article describes the Grand County Public Library (GCPL) which was awarded the 2007 Best Small Library in America, an award sponsored by "Library Journal" and the Bill & Melinda Gates Foundation. Some 4800 of Grand County, Utah's 8,826 people live in Moab and the rest in the adjacent Spanish Valley and environs. The locals are a sizable group…

  12. 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…

  13. Living with Kidney Cancer

    MedlinePLUS

    Living With Cancer Day to Day The impact of kidney cancer on your life is complex. Here are suggestions on what to expect — from employment matters and ... least one half hour of exercise every other day. Vigorous walking, jogging, swimming, or other aerobic exercise ...

  14. 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,…

  15. Living or Nonliving?

    ERIC Educational Resources Information Center

    Legaspi, Britt; Straits, William

    2011-01-01

    Categorizing organisms as living or nonliving things may seem to be intuitive by nature. Yet, it is regulated by scientific criteria. Students come to school with rules already in place. Their categorizing criteria have already been influenced by their personal experiences, also known as observations and inferences. They believe that all things…

  16. Living with Vasculitis

    MedlinePLUS

    ... your quality of life. Joining a patient support group may help you adjust to living with vasculitis. You can ... them. Talk with your doctor about local support groups or check with an area medical center. Support from family and friends also can help relieve stress and anxiety. Let your loved ones ...

  17. Living with Marfan Syndrome

    MedlinePLUS

    ... your quality of life. Joining a patient support group may help you adjust to living with Marfan syndrome. You ... it. Talk with your doctor about local support groups or check with an area medical center. Support from family and friends also can help relieve stress and anxiety. Let your loved ones ...

  18. Living with ARDS

    MedlinePLUS

    ... your quality of life. Joining a patient support group may help you adjust to living with ARDS. You can ... them. Talk to your doctor about local support groups or check with an area medical center. Support from family and friends also can help relieve stress and anxiety. Let your loved ones ...

  19. Living with Thalassemias

    MedlinePLUS

    ... your quality of life. Joining a patient support group may help you adjust to living with thalassemia. You can ... them. Talk with your doctor about local support groups or check with an area medical center. Support from family and friends also can help relieve stress and anxiety. Let your loved ones ...

  20. Living with Hemochromatosis

    MedlinePLUS

    ... your quality of life. Joining a patient support group may help you adjust to living with hemochromatosis. You can ... them. Talk with your doctor about local support groups or check with an area ... and friends also can help relieve stress and anxiety. Let your loved ones ...

  1. Solar System Live

    NSDL National Science Digital Library

    Walker, John

    The website Solar System Live includes applets showing the positions of the planets. One can see all of the planets in the solar system or just the inner planets. Visitors are encouraged to compare the view of the inner planets with what can be seen in the night sky.

  2. Live Science: Hot Topics

    NSDL National Science Digital Library

    This website from Live Science looks at a multitude of topics and the latest news and/or inventions in the topic. Topics include: Nanotechnolgy, Science, Robots, Biotechnology, Inventions, Technology and more. Each page includes a collection of resources on each topic.

  3. Choice of Living Arrangements

    ERIC Educational Resources Information Center

    Stancliffe, R. J.; Lakin, K. C.; Larson, S.; Engler, J.; Taub, S.; Fortune, J.

    2011-01-01

    Background: The rights to choose where and with whom to live are widely endorsed but commonly denied to adults with intellectual disabilities (ID). The current study provides a contemporary benchmark on the degree of choice exercised by adult service users in the USA. Method: Data came from the National Core Indicators programme. Participants were…

  4. Family Living Supplement.

    ERIC Educational Resources Information Center

    Truitt, Debbie

    This family living supplement contains 125 supplemental ideas and strategies designed to help vocational home economics teachers increase student motivation and enrich the teaching process. Ideas and strategies are organized into seven sections. These are career planning, securing a job, and career success; managing financial resources, buying…

  5. Meander formation in supraglacial streams

    NASA Astrophysics Data System (ADS)

    Karlstrom, Leif; Gajjar, Parmesh; Manga, Michael

    2013-09-01

    Meandering streams on the surface of glaciers are similar in planform geometry to meanders in alluvial and bedrock rivers, despite fundamental differences in the mechanisms and timescales of incision. We develop depth-averaged conservation equations for flow in such supraglacial channels with erodible boundaries and solve the linear stability problem for harmonic perturbations to an initially straight channel. Meander formation in supraglacial streams is driven by channel curvature, which enhances heat production and heat transfer to the surrounding ice at bend apexes. This leads to enhanced melting and lateral channel migration, with near constant channel width maintained by the competition of lateral erosion and broadscale ablation of the glacier surface. We find that meandering occurs for a wide but finite range of hydraulic and thermal parameters in both subcritical and supercritical flows and that meanders usually propagate downstream. Predicted meander wavelengths are in general agreement with an empirical scaling between supraglacial channel width and meander wavelength derived from glacial environments worldwide.

  6. Assay of forties stream updated

    SciTech Connect

    Rhodes, A.K.

    1991-07-15

    This paper reports on characteristics of crude oil from the important North Sea Forties stream that have been updated. Forties oil field went on production in September 1975, operated by BP Exploration Co. Ltd. Since then, six other U.K. fields and Norway's Heimdal field have been tied into the system. Fields currently included in the stream are Forties; South, Central, and North Brae; Balmoral; Montrose/Arbroath; Buchan; and Heimdal. Production in the Forties filed peaked in 1978--81 at 500,000 b/d. By 1983, it had dropped to 447,000 b/d, and by March 1987, to about 400,000 b/d. Current production is about 200,000 b/d. The original pipeline was laid in 1973--74 from the Forties field in Block 21/10 of the North Sea's U.K. sector to the Cruden Bay terminal near Peterhead, Scotland.

  7. Streaming Media Mark D. Hendricks

    E-print Network

    Farritor, Shane

    §Mobile devices (iOS and Android) #12;Bandwidth §Means less as time progresses, but still a factor://byf.unl.edu - uses JW Player, flash plugin and JavaScript. Good solution until html5 Does not work on iOS devices #12;iOS/Android Devices #12;Ed Media Video Production #12;Ed Media Stream Request Form #12;#12;Mark D

  8. Multilevel Secure Data Stream Processing

    Microsoft Academic Search

    Raman Adaikkalavan; Indrakshi Ray; Xing Xie

    \\u000a With sensors and mobile devices becoming ubiquitous, situation monitoring applications are becoming a reality. Data Stream\\u000a Management Systems (DSMSs) have been proposed to address the data processing needs of such applications that require collection\\u000a of high-speed data, computing results on-the-fly, and taking actions in real-time. Although a lot of work appears in the area\\u000a of DSMS, not much has been

  9. Prediction of mountain stream morphology

    Microsoft Academic Search

    Ellen Wohl; David Merritt

    2005-01-01

    We use a large and diverse data set from mountain streams around the world to explore relationships between reach-scale channel morphology and control variables. The data set includes 177 step-pool reaches, 44 plane-bed reaches, and 114 pool-riffle reaches from the western United States, Panama, and New Zealand. We performed several iterations of stepwise discriminant analysis on these data. A three-variable

  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. 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.

  12. Fast Near-Optimal Algorithm for Delivering Multiple Live Video Channels in CDNs

    E-print Network

    Paris-Sud XI, Université de

    Fast Near-Optimal Algorithm for Delivering Multiple Live Video Channels in CDNs Jiayi Liu Gwendal, and near-optimal algorithm with performance approximation ratios that are negligible for large network an aggregated bit-rate over 30 Mbps) should be delivered to the edge-servers. The streaming capacity of networks

  13. Generating Corpora of Activities of Daily Living and Towards Measuring the Corpora's

    E-print Network

    Brom, Cyril

    Generating Corpora of Activities of Daily Living and Towards Measuring the Corpora's Complexity@matfyz.cz,brom@ksvi.mff.cuni.cz http://amis.ms.mff.cuni.cz Abstract. Episodic memory modeling enjoys increasing interest in vir- tual, it is often necessary to "fill" them with appropriate data - streams of activities corresponding to what would

  14. The Living Edens

    NSDL National Science Digital Library

    This web site is the homepage of the Public Broadcasting System's (PBS) The Living Edens. This natural history series introduces viewers to isolated, undisturbed corners of the world. The Living Edens companion Web sites hold many resources for teachers. Each program has a listing of resources that enhance the content that was provided in the program. Classroom activities and guides are provided for each area. Teachers from around the country collaborated to create fun and interesting guides for all teachers. Regions covered include: Anamalai in India, Bhutan, Borneo, Canyonlands in Utah, Costa Rica, Denali in Alaska, Etosha Pan in Namibia, Glacier Bay in Alaska, Kakadu in Northern Territory, Australia, Kamchatka in northeastern Russia, Madagascar, Manu in Peru, Namib in southwestern Africa, Ngorongoro in Tanzania, Palau in Micronesia, Patagonia in Argentina, South Georgia Island in the Southern Ocean, Tasmania in Australia, and Yellowstone National Park in Wyoming, Idaho, and Montana.

  15. The Living Lakes

    NSDL National Science Digital Library

    Living Lakes Partnership, a nonprofit organization has a goal to "create and support a network within which local lake organizations can find critical kinds of assistance for promoting sustainable development in lake areas." Their award winning site highlights nearly twenty lakes around the world, describing their individual, watershed, and biological characteristics as well as the geologic and human history of the area. The Living With Lakes section discusses lake management and conservation issues dealing with agriculture and urban areas (such as pollution and habitat loss). Other links include a photo gallery, news and events section, discussion groups, and much more. Visitors will enjoy the rich content and visuals that make up this site and will find themselves exploring it for some time and learning along the way.

  16. Soil as Living Skin

    NSDL National Science Digital Library

    Pulse of the Planet

    2006-06-26

    In this two-minute radio program, a soil scientist introduces listeners to reasons why soil is crucial to the planet. The scientist lists functions of soil that include nutrient cycling and water filtration, and he also uses living skin as an analogy for soil. The program, part of the Pulse of the Planet radio show, is available here in text and audio formats. Copyright 2005 Eisenhower National Clearinghouse

  17. Stories Lives Tell

    Microsoft Academic Search

    Melissa M. Terras

    \\u000a As noted by Maxine Greene in her Foreword to the remarkable book Stories Lives tell: Narrative and Dialogue in Education (Witherell\\u000a and Noddings, 1991), from which the title of this chapter is taken, we can hear “the sounds of storytelling everywhere today.\\u000a Narratives of many kinds are being opened and explored. Journal keeping goes on apace on all levels of

  18. Living Bay Online

    NSDL National Science Digital Library

    Learning resources about oysters and current issues in Chesapeake Bay. Students learn about oyster anatomy, ballast water, invasive species and more through online puzzles. Teachers can download 10 multidisciplinary lesson plans about oyster biology and fishery issues. Links to web resources on the Bay, oysters, plankton and biofilms. Also available: day programs with hands-on and shipboard activities for at-risk students and others at Living Classrooms Foundation facilities in Maryland and New Jersey.

  19. Living in the Weather

    NSDL National Science Digital Library

    National Science Teachers Association (NSTA)

    2006-12-13

    What is weather? Is climate different from weather? It doesn't matter where you live or where you travel, weather patterns influence your daily life. In this guide, students will engage in exploring and predicting the conditions in the atmosphere that are responsible for weather patterns and climatic conditions, and investigate how extreme weather impacts humans and the environment. While many of the keywords embedded into the "Living in the Weather" themes will be familiar, do your students really understand them? This guide provides teacher-tested, reliable links that allow you and your students to "surf" the internet in a quest to better understand how atmospheric conditions directly relate to weather on Earth. Understanding weather and climate can be a great opportunity for you to engage students in topics and themes that connect Earth and space science, life science, and physical science in a real way. The National Science Education Standards (NSES) focus on the study of weather and climate and their impact on human life. This guide uses the ongoing work and technology of the National Oceanic and Atmospheric Administration (known to the public simply as NOAA). NOAA scientists study our planet Earth in a global way. Working together with scientists worldwide, NOAA scientists study the diversity of living organisms (including humans) and their impact on our environment--not only in our country but in every country and continent around the world.

  20. Assessing stream temperature response to environmental change

    NASA Astrophysics Data System (ADS)

    MacDonald, R. J.; Boon, S.; Byrne, J. M.

    2010-12-01

    Stream temperature controls aquatic ecosystem function by directly influencing water quality, ecosystem productivity, and the physiological functioning of aquatic organisms. To date, there are limited studies of the impacts of environmental disturbance on stream temperature, particularly on the eastern slopes of the Rocky Mountains. This region provides key habitat for native salmonid species such as westslope cutthroat trout (Oncorhynchus clarkii lewisi) and bull trout (Salvelinus confluentus), which are listed as ‘threatened’ and ‘species of special concern’, respectively. Increases in stream temperature could limit habitat availability, reduce competitive advantage, and potentially increase mortality rates for these native species. This study uses field data collected at high spatiotemporal resolution to develop a spatial stream temperature model that simulates the mass and energy balance of the stream system. Preliminary field results demonstrate the high spatial and temporal variability in processes governing stream temperature in three study stream reaches. Groundwater/surface water interactions, topographic setting, and local meteorological conditions all contribute in determining stream thermal regimes. This work discusses how these primary drivers of stream temperature can be incorporated into a physically based spatial model, and demonstrates how depending on the scale of interest, the temperature of a stream can be governed by very different contributing factors.

  1. Community Living Skills Guide: Homemaking and Family Living.

    ERIC Educational Resources Information Center

    Jones, Gwen; Kreps, Alice Roelofs

    This is one of twenty course guides in the Community Living Skills Guide for the College for Living series which provides guidelines and workbook activities for the course, Homemaking and Family Living. The series of courses for developmentally disabled adults is intended to supplement residential programs and to aid in orienting institutionalized…

  2. Impact of acid mine drainage on benthic communities in streams: the relative roles of substratum vs. aqueous effects.

    PubMed

    DeNicol, Dean M; Stapleton, Michael G

    2002-01-01

    Restoration of streams impacted by acid mine drainage (AMD) focuses on improving water quality, however precipitates of metals on the substrata can remain and adversely affect the benthos. To examine the effects of AMD precipitates independently of aqueous effects, four substrata treatments, clean sandstone, clean limestone, AMD precipitate-coated sandstone and coated limestone, were placed in a circumneutral stream of high water quality for 4 weeks. Iron and Al were the most abundant metals on rocks with AMD precipitate. and significantly decreased after the exposure. Precipitate on the substrata did not significantly affect macroinvertebrate or periphyton density and species composition. In an additional experiment, percent survival of caged live caddisflies was significantly lower when exposed in situ for 5 days in an AMD affected stream than in a reference stream. Caddisfly whole-body concentrations of all combined metals and Fe alone were significantly higher in the AMD stream. Whole-body metal concentrations were higher in killed caddisflies than in live, indicating the importance of passive uptake. The results suggest the aqueous chemical environment of AMD had a greater affect on organisms than a coating of recent AMD precipitate on the substrata (ca. 0.5 mm thick), and treatment that improves water quality in AMD impacted streams has the potential to aid in recovery of the abiotic and biotic benthic environment. PMID:12166664

  3. 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 copies of all or part of this work for personal or classroom use is granted without fee provided to lists, requires prior specific permission and/or a fee. NOSSDAV'10, June 2­4, 2010, Amsterdam

  4. Sentiment Knowledge Discovery in Twitter Streaming Data

    NASA Astrophysics Data System (ADS)

    Bifet, Albert; Frank, Eibe

    Micro-blogs are a challenging new source of information for data mining techniques. Twitter is a micro-blogging service built to discover what is happening at any moment in time, anywhere in the world. Twitter messages are short, and generated constantly, and well suited for knowledge discovery using data stream mining. We briefly discuss the challenges that Twitter data streams pose, focusing on classification problems, and then consider these streams for opinion mining and sentiment analysis. To deal with streaming unbalanced classes, we propose a sliding window Kappa statistic for evaluation in time-changing data streams. Using this statistic we perform a study on Twitter data using learning algorithms for data streams.

  5. Accretion Stream Mapping of HU Aquarii

    E-print Network

    Sonja Vrielmann; Axel D. Schwope

    2000-09-26

    We present a new mapping algorithm, the "Accretion Stream Mapping (ASM)" which uses the full phase-coverage of a light curve to derive spatially resolved intensity distributions along the accretion stream in magnetic cataclysmic variables of AM Herculis type (polars). The surface of the accretion stream is approximated as a duodecadon shaped tube. After successfully testing this method on artificial data we applied it to emission line light curves of Hbeta, Hgamma and He II lambda 4686 of the bright eclipsing polar HU Aqr. We find Hydrogen and Helium line emission bright in the threading region of the stream where the stream couples onto magnetic field lines. It is particularly interesting, that the stream is bright on the irradiated side, facing the white dwarf, which highlights the interplay of collisional and radiative excitation/ionization.

  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. 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).

  8. The fate of nutrients in streams

    SciTech Connect

    Mulholland, P.

    1993-01-01

    In addition to important basic questions of ecological science, studies of streams and rivers contribute to an understanding of how to manage these systems to preserve or enhance their value as drinking water sources, recreation areas, and wildlife habitats. A factor that affects both ecological and human health is the concentration of various nutrients in streams. The research programs carried out at ORNL over the last few decades are briefly discussed along with current efforts on nutrient cycling in streams.

  9. Mining Concept-Drifting Data Streams

    Microsoft Academic Search

    Haixun Wang; Philip S. Yu; Jiawei Han

    2010-01-01

    \\u000a Knowledge discovery from infinite data streams is an important and difficult task. We are facing two challenges, the overwhelming\\u000a volume and the concept drifts of the streaming data. In this chapter, we introduce a general framework for mining concept-drifting\\u000a data streams using weighted ensemble classifiers. We train an ensemble of classification models, such as C4.5, RIPPER, naive\\u000a Bayesian, etc., from

  10. A classification algorithm for noisy data streams

    Microsoft Academic Search

    Yan Li; Yuhong Zhang; Xuegang Hu; Pei-Pei Li

    2010-01-01

    Classification on noisy data streams has recently become one of the most important topics in streaming data mining. In this paper, a Classification algorithm for mining Data Streams based on Mixture Models of C4.5 and NB is proposed called CDSMM. In this algorithm, C4.5 is used as the base classifiers, the hypothesis testing method is introduced for the detection of

  11. Layered peer-to-peer streaming

    Microsoft Academic Search

    Yi Cui; Klara Nahrstedt

    2003-01-01

    In this paper, we propose a peer-to-peer streaming solution to address the on-demand media distribution problem. We identify two issues, namely the asynchrony of user requests and heterogeneity of peer network bandwidth. Our key techniques to address these two issues are cache-and-relay and layer-encoded streaming. A unique challenge of layered peer-to-peer streaming is that the bandwidth and data availability (number

  12. Stream Corridor Restoration: Principles, Processes, and Practices

    NSDL National Science Digital Library

    The Natural Resources Conservation Service (NRCS) and fifteen federal agencies have collaborated to create this "common reference for people who are involved in planning, designing, and implementing stream corridor restorations." Preceding the release of the printed version (October 1998), this online version includes full text, color graphics, a slide show on stream corridors, three case studies from streams in New Mexico and Washington, and a collection of useful links to related sites in education, research techniques, and river management.

  13. Hardware Framework for the Rabbit Stream Cipher

    Microsoft Academic Search

    Deian Stefan

    2009-01-01

    Rabbit is a software-oriented synchronous stream cipher with very strong security properties and support for 128-bit keys. Rabbit is part of the European Union's eSTREAM portfolio of stream ciphers addressing the need for strong and computationally ecient (i.e., fast) ciphers. Extensive cryptanalysis conrms Rabbit's strength against mod- ern attacks; attacks with complexity lower than an exhaustive key search have not

  14. Fuzzy Clustering of Parallel Data Streams

    Microsoft Academic Search

    Jurgen Beringer; Eyke Hullermeier

    The management and processing of so-called data streams has recently become a topic of active research in several elds of computer science, notably database systems and data mining. A data stream can roughly be thought of as a transient, continuously increasing sequence of time-stamped data. In this paper, we consider the problem of clustering par- allel streams of real-valued data,

  15. Measurement of Stream Discharge by Wading

    USGS Publications Warehouse

    Nolan, K. Michael; Shields, Ronald R.

    2000-01-01

    Most years the U.S. Geological Survey (USGS) makes over 50,000 stream discharge measurements. Over 75 percent of those measurements are made by wading streams and using the velocity-area method. This PowerPoint presentation describes how stream discharge should be measured when wading and using the velocity-area method. It is intended as a learning and reference tool for anyone responsible for making wading discharge measurements.

  16. Experimental investigation of plasma stream injection

    Microsoft Academic Search

    Huang Chaosong; Ren Zhaoxing

    1989-01-01

    Experimental investigation of plasma stream injection into a simple mirror device has been performed. The parameters of the plasma stream are determined. The electron temperature is 4 eV, the velocity of the stream is about 5\\/times\\/10⁶ cm\\/s. The plasma density and plasma current reach 10¹⁴ cm\\/sup \\/minus\\/3\\/ and 450 A, respectively. The plasma trapped in the mirror device drives an

  17. Live Access Server

    NSDL National Science Digital Library

    Steve Hankin

    2002-09-09

    The Live Access Server (LAS) is a highly configurable Web server designed to provide flexible access to geo-referenced scientific data. LAS enables users to view data with on-the-fly graphics, request custom subsets of variables in a variety of file formats, and compare variables from distributed locations. LAS enables the data provider to unify access to multiple types of data in a single interface, create thematic data servers from distributed data sources (through the use of DODS/OPenDAP), offer derived products on the fly, and offer unique products (e.g. visualization styles specialized for the data).

  18. 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.

  19. Live Cams: Discovery Channel

    NSDL National Science Digital Library

    With cameras operating in Alaska, Hudson Bay and other far-flung locales, the Discovery Channel's Live Cams page is a great resource for those who love nature in all of its manifestations. First-time visitors should check out the Alaska: The Last Frontier cams as they offer a rich look at this most fascinating state. The Shark Cam is a delight as well and features sharks in the National Aquarium, including black-tip sharks, zebra sharks, and more. The Penguin Cam is also quite fun and visitors can watch the behavior of rockhopper and African penguins at the Audubon Aquarium of the Americas.

  20. 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.

  1. 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.

  2. Skulls : living tissue

    NSDL National Science Digital Library

    California Academy of Sciences

    2005-01-01

    This site discusses how bones are living tissue and therefore can grow and repair themselves. It mentions how skulls can reveal how healthy the animal was when it was alive or what may have caused its death. By focusing on a sea lion, the site explains how skull bones are different for males and females and how its age can be determined from its teeth. A unique feature allows visitors to rotate images of skulls 360 degrees, so they can view them from all angles. Copyright 2005 Eisenhower National Clearinghouse

  3. 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.

  4. The Gulf Stream and Density of Fluids

    NSDL National Science Digital Library

    Erich Landstrom

    2006-09-01

    A few kilometers from the shores of Palm Beach County, Florida, the Gulf Stream current--a remarkable "river" within an ocean--makes its closest approach to land. To help Integrated Science students understand why and how the Gulf Stream flows, they study how Florida's Gulf Stream current could be responsible for the wreck of the Titanic using the 5E constructivist instructional model--Engage, Explore, Explain, Elaborate, and Evaluate--to analyze a single problem: Why wasn't the iceberg that sank the Titanic either dissolved or deflected eastward by the Gulf Stream before the collision?

  5. SenQ: An Embedded Query System for Streaming Data in Heterogeneous Interactive Wireless Sensor Networks

    Microsoft Academic Search

    Anthony D. Wood; Leo Selavo; John A. Stankovic

    2008-01-01

    Interactive wireless sensor networks (IWSNs) manifest di- verse sensors and dynamicuser interactions. To support data collectionandprocessingin suchheterogeneoussystems, we created SenQ: an extensible query system and network pro- tocol for streaming sensor data. We evaluate it using a set of devices we developed for physiological, environmental, and activity monitoring in the context of assisted-living. Rather than tree-based wide-areasensor aggregationcom- mon in

  6. The Galactic Anticenter Stellar Stream

    E-print Network

    Helio J. Rocha-Pinto; Steven R. Majewski; M. F. Skrutskie; Jeffrey D. Crane

    2003-07-11

    The recently discovered, ring-like structure just outside the Galactic disk in Monoceros is detected and traced among 2MASS M giant stars. We have developed a method to recover the signature of this structure from the distance probability density function of stars along a given line of sight. Its detection is possible even when the metallicity is unknown, provided that the structure is not too embedded in the disk. Application of this method reveals the presence of a large group of M giant stars at a Galactocentric distance of 18$\\pm 2$ kpc, over $+36\\degrstream extends to high negative latitudes is also found. That the structure contains M giants shows that it contains populations of at least an order of magnitude higher abundance than the [Fe/H] = -1.6 mean metallicity previously reported for this system. The structural characteristics of the stellar stream as traced by M giants do not support the interpretation of this structure as a homogeneously dense ring that surrounds the Galaxy, but as a more localized structure, possibly a merging dwarf galaxy with tidal arms, like the Sagittarius dwarf galaxy.

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

    PubMed

    Butler, J J; 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. PMID:11554242

  8. SyncStream: Synchronized Media Streaming System in a Peer-to-Peer Environment

    Microsoft Academic Search

    Daeil Seo; Suhyun Kim; Gyuwon Song

    2010-01-01

    With recent advances in video encoding and network technology, media streaming services are getting popular. Media streaming system based on the traditional server\\/client or CDN architecture has a scalability problem, and peer-to-peer media streaming system using resources of peers in the system can provide better scalability. Previous media streaming services are suited to play stored contents such as dramas or

  9. Stream-Oriented FPGA Computing in the Streams-C High Level Language

    Microsoft Academic Search

    Maya Gokhale; Janice M. Stone; Jeffrey M. Arnold; Mirek Kalinowski

    2000-01-01

    Stream oriented processing is an important methodology used in FPGA-based parallel processing. Characteristics of stream-oriented computing include high-data-rate flow of one or more data sources; fixed size, small stream payload (one byte to one word); compute-intensive operations, usually low precision fixed point, on the data stream; access to small local memories holding coefficients and other constants; and occasional synchronization between

  10. 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.

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

    Microsoft Academic Search

    Bart W. Durham; Gene R. Wilde

    2006-01-01

    We studied the relationship between stream discharge and reproductive success for five members of a prairie stream fish assemblage. Based on information obtained from the literature, we constructed seven models relating stream discharge to successful reproduction. To assess the utility of our models, we collected larval and juvenile Arkansas River shiners Notropis girardi, peppered chub Macrhybopsis tetranema, plains minnow Hybognathus

  12. Stormwater and Streams A Collaboration to Protect the Thermal Regime in New England Streams

    E-print Network

    New Hampshire, University of

    Stormwater and Streams A Collaboration to Protect the Thermal Regime in New England Streams Dr program exploring the impact of stormwater runoff on stream temperature. Our proposed project objective occurs, the stormwater runoff from impervious surface area increases and can be a significant, or even

  13. A graded stream response relation for bed load-dominated streams

    Microsoft Academic Search

    Brett C. Eaton; Michael Church

    2004-01-01

    The relation between equilibrium stream channel morphology and three independent governing variables, discharge, sediment supply, and valley slope, is investigated using a stream table. The experiments are based on a generic physical model of a laterally active gravel bed stream and directed by a recently published rational regime model. While a variety of channel adjustments are possible, the primary adjustment

  14. StreamGP: Tracking Evolving GP Ensembles in Distributed Data Streams using Fractal Dimension

    E-print Network

    Fernandez, Thomas

    StreamGP: Tracking Evolving GP Ensembles in Distributed Data Streams using Fractal Dimension that comes from multiple locations. The approach is able to handle concept drift via change detection- populations to transfer the knowledge acquired on the own local data. StreamGP models the system

  15. StatStream: Statistical Monitoring of Thousands of Data Streams in Real Time

    Microsoft Academic Search

    Yunyue Zhu; Dennis Shasha

    2002-01-01

    Abstract: Consider the problem of monitoring tens ofthousands of time series data streams in anonline fashion and making decisions based onthem. In addition to single stream statisticssuch as average and standard deviation,we also want to find high correlations amongall pairs of streams. A stock market tradermight use such a tool to spot arbitrage opportunities.

  16. Estimating simple functions on the union of data streams

    Microsoft Academic Search

    Phillip B. Gibbons; Srikanta Tirthapura

    2001-01-01

    Massive data sets often arise as physically distributed, parallel data streams. We present algorithms for estimating simple functions on the union of such data streams, while using only logarithmic space per stream. Each processor observes only its own stream, and communicates with the other processors only after observing its entire stream. This models the set-up in current network monitoring products.

  17. Performance analysis and network path characterization for scalable internet streaming

    E-print Network

    Kang, Seong-Ryong

    2008-10-10

    . Analysis of Video Streaming . . . . . . . . . . . . . . . . . . . . 24 1. Best-Efiort Streaming . . . . . . . . . . . . . . . . . . . . . 25 2. Optimal Preferential Streaming . . . . . . . . . . . . . . . . 28 C. Preferential Video Streaming Framework... . . . . . . . . . . . . . . . . . . 71 5. Non-Stationary Initial State . . . . . . . . . . . . . . . . . . 73 D. Performance of FEC in Scalable Streaming . . . . . . . . . . . . 78 1. Markov Packet Loss . . . . . . . . . . . . . . . . . . . . . . 79 2. Utility...

  18. Signalling Management to Reduce Roaming Effects over Streaming Services

    Microsoft Academic Search

    Manuel Vilas; Xabiel G. Pañeda; David Melendi; Roberto García; Víctor G. García

    2006-01-01

    Multimedia streaming services performance depends on network conditions. To actively adapt streaming flow consumptions, streaming clients and servers estimate the available bandwidth. In recent years, intense research activity has been carried out on the effects of wireless LAN over streaming services. In this paper, the analysis is focused on the effective periods of time during which streaming clients fail to

  19. Finding recent frequent itemsets adaptively over online data streams

    Microsoft Academic Search

    Joong Hyuk Chang; Won Suk Lee

    2003-01-01

    A data stream is a massive unbounded sequence of data elements continuously generated at a rapid rate. Consequently, the knowledge embedded in a data stream is more likely to be changed as time goes by. Identifying the recent change of a data stream, specially for an online data stream, can provide valuable information for the analysis of the data stream.

  20. A Framework for Projected Clustering of High Dimensional Data Streams

    Microsoft Academic Search

    Charu C. Aggarwal; Jiawei Han; Jianyong Wang; Philip S. Yu

    2004-01-01

    The data stream problem has been studied ex- tensively in recent years, because of the great ease in collection of stream data. The na- ture of stream data makes it essential to use algorithms which require only one pass over the data. Recently, single-scan, stream anal- ysis methods have been proposed in this con- text. However, a lot of stream

  1. Polynomial Fitting of Data Streams with Applications to Codeword Testing

    E-print Network

    Paris-Sud XI, Université de

    Polynomial Fitting of Data Streams with Applications to Codeword Testing Andrew McGregora , Atri regarding the tolerant testing of codes in the data stream model. Keywords and phrases Streaming, Polynomial. We present data stream algorithms for both problems. The case for data stream algorithms as a tool

  2. REGIONAL METHODS INITIATIVE: DEVELOPMENT OF BIOLOGICAL INDICATORS, METHODS AND ASSESSMENT TECHNIQUES IN FIRST ORDER AND INTERMITTENT STREAMS: HEADWATER INTERMITTENT STREAMS STUDY

    EPA Science Inventory

    Headwater streams represent the majority of streams and stream miles within many stream networks. Because headwater streams represent the interface between surrounding land use and downstream waterbodies, there has been a growing interest in monitoring the condition of headwater...

  3. 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.

  4. More of the same: high functional redundancy in stream fish assemblages from tropical agroecosystems.

    PubMed

    Casatti, Lilian; Teresa, Fabrício Barreto; Zeni, Jaquelini de Oliveira; Ribeiro, Mariela Domiciano; Brejão, Gabriel Lourenço; Ceneviva-Bastos, Mônica

    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. PMID:25822887

  5. Impact of Invasive Fish on Nitrogen Transport to Adjacent Stream Habitats

    NASA Astrophysics Data System (ADS)

    Tronstad, L.; Hall, R.; Koel, T.

    2005-05-01

    Consumers can alter in-situ ecosystem processes, but less is known about their impacts on adjacent habitats. Animals may influence ecosystem dynamics in adjacent areas, especially if energy is exchanged between systems. Lake trout (Salvelinus namaycush) were introduced to Yellowstone Lake and are reducing the native Yellowstone cutthroat trout (Oncorhynchus clarki bouvieri) through predation. Both trout live in Yellowstone Lake, but only cutthroat spawn in and transport nutrients to streams. To estimate the indirect impact of lake trout on nutrient cycling in adjacent streams, we estimated how much nitrogen cutthroat transport. Spawners supplied 100 mg NH4-N m-2d-1 prior to lake trout when 50,000 cutthroat spawned, but only 1.8 mg NH4-N m-2d-1 to tributary streams in 2004 when 1,400 fish spawned. In contrast, cutthroat excreted 5.9 mg NH4-N m-2d-1 in Yellowstone Lake prior to lake trout and only 1.9 mg NH4-N m-2d-1 currently. Given a 90 day spawning period, tributary streams are more impacted (8,838 mg NH4-N m-2yr-1) than Yellowstone Lake (1,460 mg NH4-N m-2yr-1). Consumers can have large impacts not only in their primary habitat, but also in neighboring areas. Less transported nitrogen could reduce stream primary and secondary production, and cutthroat recruitment through time.

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

    NASA Astrophysics Data System (ADS)

    Casatti, Lilian; Teresa, Fabrício Barreto; Zeni, Jaquelini de Oliveira; Ribeiro, Mariela Domiciano; Brejão, Gabriel Lourenço; Ceneviva-Bastos, Mônica

    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.

  7. Comparison of bioassessment results and costs between preserved and unpreserved macroinvertebrate samples from streams.

    PubMed

    Keizer-Vlek, Hanneke E; Goedhart, Paul W; Verdonschot, Piet F M

    2011-04-01

    The choice to use or not use a preservative before sorting macroinvertebrate samples (i.e., dead specimens vs. living specimens) is based on studies not solely focused on the effects of preservation. Using identical sample processing protocols, we compared preserved and unpreserved samples for the following parameters: (1) the number of taxa and individuals for each major macroinvertebrate group, (2) ecological quality classes calculated with a multimetric index developed for the assessment of small Dutch lowland streams, and (3) costs of sample processing. We collected macroinvertebrate samples from three lowland streams in the Netherlands. At each site, we collected six replicate samples, of which three samples were preserved and three were not. Significantly different numbers of Ephemeroptera individuals and Hydracarina taxa and individuals were collected from preserved samples compared to unpreserved samples. In assessments based on these individual metrics, standardization of sample processing will be required. In streams with Ephemeroptera, the preservation of samples is necessary to optimize the number of Ephemeroptera individuals collected. In streams that contain Hydracarina, the preservation of samples will result in an underestimation of the number of Hydracarina taxa and individuals present. In only one instance there was a difference in ecological quality between preserved and unpreserved samples, indicating that assessing small Dutch lowland streams does not require standardization of sample preservation as part of the sample processing protocol. We detected no significant differences in sample processing costs between preserved and unpreserved samples. PMID:20544275

  8. 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...

  9. Automatic Program Extraction From TV Streams

    Microsoft Academic Search

    Gaël Manson; Xavier Naturel; Sid-Ahmed Berrani

    This demo presents a method of detecting television programs in TV streams. The objective is to automatically detect the precise start and end of broadcasted television programs. The method first detects inter-programs (commercials, trailers. . . ) as repeated se- quences in the broadcast stream, and then deduces the programs boundaries. The extracted programs can then be stored in a

  10. Validating Streaming XML Documents Luc Segou n

    E-print Network

    Segoufin, Luc

    Validating Streaming XML Documents Luc Segou n INRIA-Rocquencourt Luc.Segou n@inria.fr Victor Vianu U.C. San Diego vianu@cs.ucsd.edu ABSTRACT This paper investigates the on-line validation of stream- ing XML documents with respect to a DTD, under memory constraints. We rst consider validation us- ing

  11. HTTP adaptive streaming with Media Fragment URIs

    Microsoft Academic Search

    Wim Van Lancker; Davy Van Deursen; Erik Mannens; Rik Van de Walle

    2011-01-01

    HTTP adaptive streaming was introduced with the general idea that user agents interpret a manifest file (describing different representations and segments of the media); whereafter they retrieve the media content using sequential HTTP progressive download operations. MPEG started with the standardization of an HTTP streaming protocol, defining the structure and semantics of a manifest file and additional restrictions and extensions

  12. A column-oriented data stream engine

    Microsoft Academic Search

    E. Liarou; R. Goncalves; M. Kersten

    This paper introduces the DataCell, a data stream man- agement system designed as a seamless integration of con- tinuous queries based on bulk event processing in an SQL software stack. The continuous stream queries are based on a predicate-window, called \\

  13. MACROINVERTEBRATE STREAM DRIFT - AN AUSTRALIAN EXAMPLE

    Microsoft Academic Search

    D. P. THORNTON

    The flow of organisms in lotic environments is known as Macroinvertebrate Stream Drift: a phenomenon that has long fascinated freshwater ecologists. Stream-dwelling organisms are often transported downstream in the water column in substantial numbers. Because they have limited swimming ability and the movement is apparently passive, the process is referred to as drift. This study assesses drift fauna in a

  14. Stream quality among active and restoring

    E-print Network

    Vallino, Joseph J.

    Stream quality among active and restoring river-based cranberry bogs Project By: Holly Engel Semester in Environmental Science 12/17/2010 #12;Holly Engel 2 ABSTRACT Some cranberry bogs on Cape Cod, MA and restoration. In this project, I assessed the quality and health of the streams in these bogs in comparison

  15. Categorizing and mining concept drifting data streams

    Microsoft Academic Search

    Peng Zhang; Xingquan Zhu; Yong Shi

    2008-01-01

    Mining concept drifting data streams is a defining challenge for data mining research. Recent years have seen a large body of work on detecting changes and building prediction models from stream data, with a vague understanding on the types of the concept drifting and the impact of different types of concept drifting on the mining algorithms. In this paper, we

  16. 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...

  17. Quality of Service-Driven Stream Mining

    Microsoft Academic Search

    Marcel Karnstedt; Kai-Uwe Sattler

    2007-01-01

    Scalable stream processing systems have to continuously manage changing resources efficiently, which is usually achieved by applying best-effort approaches on the level of processing operations. Thus, several authors have recently dealt with the problem of resource-aware stream process- ing, proposing methods and techniques capable of adapt- ing to changing resources, both on the system and operator level. In this paper,

  18. Talented Streams Objects composed from Features

    E-print Network

    Nierstrasz, Oscar

    these problems in the standard Pharo implementation of streams and Xtreams. To circumvent a class explosion Duplication . . . . . . . . . . . . . . . . . . . . . 6 2.3 Analyzing Pharo Streams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5 Conclusion 22 6 Acknowledgments 23 ii #12;List of Figures 1 UML class diagram of the basic Pharo

  19. Assessing stream temperature response to environmental change

    Microsoft Academic Search

    R. J. MacDonald; S. Boon; J. M. Byrne

    2010-01-01

    Stream temperature controls aquatic ecosystem function by directly influencing water quality, ecosystem productivity, and the physiological functioning of aquatic organisms. To date, there are limited studies of the impacts of environmental disturbance on stream temperature, particularly on the eastern slopes of the Rocky Mountains. This region provides key habitat for native salmonid species such as westslope cutthroat trout (Oncorhynchus clarkii

  20. Finding Frequent Items in Data Streams

    Microsoft Academic Search

    Moses Charikar; Kevin Chen; Martin Farach-colton

    2002-01-01

    We present a 1-pass algorithm for estimating the most fre- quent items in a data stream using very limited storage space. Our method relies on a novel data structure called a count sketch, which allows us to estimate the frequencies of all the items in the stream. Our algorithm achieves better space bounds than the previous best known algorithms for

  1. Models and issues in data stream systems

    Microsoft Academic Search

    Brian Babcock; Shivnath Babu; Mayur Datar; Rajeev Motwani; Jennifer Widom

    2002-01-01

    In this overview paper we motivate the need for and research issues arising from a new model of data processing. In this model, data does not take the form of persistent relations, but rather arrives in multiple, continuous, rapid, time-varying data streams. In addition to reviewing past work relevant to data stream systems and current projects in the area, the

  2. Proxy Prefix Caching for Multimedia Streams

    Microsoft Academic Search

    Subhabrata Sent; Jennifer Rexford; Donald F. Towsley

    1999-01-01

    High latency and loss rates in the Internet make it difficult to stream audio and video without introducing a large playback delay. To address these problems, we propose a prefix caching technique whereby a proxy stores the initial frames of popular clips. Upon receiving a request for the stream, the proxy initiates transmission to the client and simultaneously requests the

  3. THE PAL 5 STAR STREAM GAPS

    SciTech Connect

    Carlberg, R. G.; Hetherington, Nathan [Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4 (Canada); Grillmair, C. J., E-mail: carlberg@astro.utoronto.ca, E-mail: hetherington@astro.utoronto.ca, E-mail: carl@ipac.caltech.edu [Spitzer Science Center, 1200 E. California Blvd., Pasadena, CA 91125 (United States)

    2012-11-20

    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{sup -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.

  4. GAPS IN THE GD-1 STAR STREAM

    SciTech Connect

    Carlberg, R. G. [Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4 (Canada); Grillmair, C. J., E-mail: carlberg@astro.utoronto.ca, E-mail: carl@ipac.caltech.edu [Spitzer Science Center, 1200 East California Boulevard, Pasadena, CA 91125 (United States)

    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.

  5. Implementation of a Streaming Execution Unit

    Microsoft Academic Search

    Dmitry Cheresiz; Ben H. H. Juurlink; Stamatis Vassiliadis; Harry A. G. Wijshoff

    2002-01-01

    Abstract: The Complex Streamed Instruction (CSI) set is an ISA extensiontargeted at multimedia applications. CSI instructions processtwo-dimensional data streams stored in memory, performingsectioning, data alignment and conversion between differentpacked data types all in hardware. It has been shown previouslythat CSI provides significant speedups compared to current mediaISA extensions such as MMX and VIS. This paper presents adetailed design of a

  6. Sentiment Knowledge Discovery in Twitter Streaming Data

    Microsoft Academic Search

    Albert Bifet; Eibe Frank

    2010-01-01

    Micro-blogs are a challenging new source of information for data mining techniques. Twitter is a micro-blogging service built to dis- cover what is happening at any moment in time, anywhere in the world. Twitter messages are short, and generated constantly, and well suited for knowledge discovery using data stream mining. We briey discuss the challenges that Twitter data streams pose,

  7. 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...

  8. Efficient Similarity Search in Streaming Time Sequences

    Microsoft Academic Search

    Maria Kontaki; Apostolos Papadopoulos

    2004-01-01

    Query processing in data streams is a very impor- tant research direction. The challenge in a database of data streams is to provide ecient algorithms and access methods for query processing, taking into con- sideration the fact that the database changes continu- ously as new data arrive. Traditional access methods that continuously update the data are considered in- ecient, due

  9. Efficient similarity search in streaming time sequences

    Microsoft Academic Search

    M. Kontaki; A. N. Papadopoulos

    2004-01-01

    Query processing in data streams is a very important research direction. The challenge in a database of data streams is to provide efficient algorithms and access methods for query processing, taking into consideration the fact that the database changes continuously as new data arrive. Traditional access methods that continuously update the data are considered inefficient, due to the significant update

  10. Streaming de vídeo em dispositivos móveis

    Microsoft Academic Search

    Fábio S. Coriolano; Thomas A. Buck

    This paper proposes techniques for media streaming transmission, reception, persistence and search for video on mobile platforms. Also it is presented a development of players, which function is the view of the multimedia streaming on cell phones. There were used standard specifications for 3GP and specialized protocols, those define the access control and distribution of multimedia content. Resumo. O presente

  11. NATIONAL STREAM QUALITY ACCOUNTING NETWORK DATA

    EPA Science Inventory

    The objectives of the U.S. Geological Surveys National Stream Quality Accounting Network (NASQAN) program are to (1) account for the quantity and quality of water moving within and from the United States, (2) depict area water-quality variability, and (3) detect changes in stream...

  12. An Interpolation Method for Stream Habitat Assessments

    Microsoft Academic Search

    Kenneth R. Sheehan; Stuart A. Welsh

    2009-01-01

    Interpolation of stream habitat can be very useful for habitat assessment. Using a small number of habitat samples to predict the habitat of larger areas can reduce time and labor costs as long as it provides accurate estimates of habitat. The spatial correlation of stream habitat variables such as substrate and depth improves the accuracy of interpolated data. Several geographical

  13. Data stream clustering for stock data analysis

    Microsoft Academic Search

    Xueyan Wu; Daoping Huang

    2010-01-01

    This paper proposes a method of data stream clustering for stock data analysis. The method aims to retain shape and tend features during the clustering process. The experimental results show that the shape-based clustering over data streams can get the evolution accuracy of 95% with the reasonable parameters.

  14. 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...

  15. Evaluating Window Joins over Unbounded Streams

    Microsoft Academic Search

    Jaewoo Kang; Jeffrey F. Naughton; Stratis Viglas

    2003-01-01

    We investigate algorithms for evaluating sliding window joins over pairs of unbounded streams. We introduce a unit- time-basis cost model to analyze the expected performance of these algorithms. Using this cost model, we propose strategies for maximizing the efficiency of processing joins in three scenarios. First, we consider the case where one stream is much faster than the other. We

  16. Maintaining Stream Statistics over Sliding Windows

    Microsoft Academic Search

    Mayur Datar; Aristides Gionis; Piotr Indyk; Rajeev Motwani

    2002-01-01

    We consider the problem of maintaining aggregates and statistics over data streams, with respect to the last N data elements seen so far. We refer to this model as the sliding window model. We consider the following basic problem: Given a stream of bits, maintain a count of the number of 1's in the last N elements seen from the

  17. 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?

  18. SWAT: Hierarchical Stream Summarization in Large Networks

    Microsoft Academic Search

    Ahmet Bulut; Ambuj K. Singh

    2003-01-01

    The problem of statistics and aggregate maintenance over data streams has gained popularity in recent years es- pecially in telecommunications network monitoring, trend- related analysis, web-click streams, stock tickers, and other time-variant data. The amount of data generated in such applications can become too large to store, or if stored too large to scan multiple times. We consider queries over

  19. 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

  20. Video quality evaluation for Internet streaming applications

    Microsoft Academic Search

    Stefan Winkler; Ruth Campos

    2003-01-01

    We carried out a number of subjective experiments using typical streaming content, codecs, bitrates and network conditions. In an attempt to review subjective testing procedures for video streaming applications, we used both Single Stimulus Continuous Quality Evaluation (SSCQE) and Double Stimulus Impairment Scale (DSIS) methods on the same test material. We thus compare these testing methods and present an analysis

  1. Processing complex aggregate queries over data streams

    Microsoft Academic Search

    Alin Dobra; Minos N. Garofalakis; Johannes Gehrke; Rajeev Rastogi

    2002-01-01

    Recent years have witnessed an increasing interest in designing algorithms for querying and analyzing streaming data (i.e., data that is seen only once in a fixed order) with only limited memory. Providing (perhaps approximate) answers to queries over such continuous data streams is a crucial requirement for many application environments; examples include large telecom and IP network installations where performance

  2. Exploiting Punctuation Semantics in Continuous Data Streams

    Microsoft Academic Search

    Peter A. Tucker; David Maier; Tim Sheard; Leonidas Fegaras

    2003-01-01

    As most current query processing architectures are already pipelined, it seems logical to apply them to data streams. However, two classes of query operators are impractical for processing long or infinite data streams. Unbounded stateful operators maintain state with no upper bound in size and, so, run out of memory. Blocking operators read an entire input before emitting a single

  3. On demand classification of data streams

    Microsoft Academic Search

    Charu C. Aggarwal; Jiawei Han; Jianyong Wang; Philip S. Yu

    2004-01-01

    Current models of the classification problem do not effectively handle bursts of particular classes coming in at different times. In fact, the current model of the classification problem simply concentrates on methods for one-pass classification modeling of very large data sets. Our model for data stream classification views the data stream classification problem from the point of view of a

  4. Efficient elastic burst detection in data streams

    Microsoft Academic Search

    Yunyue Zhu; Dennis Shasha

    2003-01-01

    Burst detection is the activity of finding abnormal aggregates in data streams. Such aggregates are based on sliding windows over data streams. In some applications, we want to monitor many sliding window sizes simultaneously and to report those windows with aggregates significantly different from other periods. We will present a general data structure for detecting interesting aggregates over such elastic

  5. Multiple Aggregations Over Data Streams Nick Koudas

    E-print Network

    Ooi, Beng Chin

    § National Univ. of Singapore Univ. of Toronto § AT&T Labs­Research {zhangru1,ooibc}@comp.nus.edu.sg koudas application for data stream management systems. The need for ex- ploratory IP traffic data analysis naturallyMultiple Aggregations Over Data Streams Rui Zhang Nick Koudas Beng Chin Ooi Divesh Srivastava

  6. Sulfur removal from a gas stream

    SciTech Connect

    Frech, K.J.; Tazuma, J.J.

    1984-03-06

    There is disclosed a process for removing sulfur compounds from a gas stream. The process involves passing the gas stream containing the sulfur compounds through a mass of porous material that has deposited upon it a metal oxide, the improvement comprises the continuous or intermittent addition of an oxidizing agent and an amine.

  7. Approximate Frequency Counts over Data Streams

    Microsoft Academic Search

    Gurmeet Singh Manku; Rajeev Motwani

    2002-01-01

    We present algorithms for computing frequency counts exceeding a user-specified threshold over data streams. Our algorithms are simple and have provably small memory footprints. Although the output is approximate, the error is guaranteed not to exceed a user-specified parameter. Our algo- rithms can easily be deployed for streams of single- ton items like those found in IP network monitor- ing.

  8. Introduction Determining the biogeochemical functions of streams,

    E-print Network

    of aqueous solutions or bubbling large amounts of SF6 into the stream. By adding the SF6 as a saturated of the rate estimate (Böhlke et al 2004; Mulholland et al. 2004), simplify the solution of the gas mass for dissolved gas mass balance studies in streams. It consists of continuously metering SF6 -saturated water

  9. BBC: Democracy Live

    NSDL National Science Digital Library

    If you take a look at this website during legislative hours in Britain, you will see a bustling set of eight small screens with activity in the Northern Ireland Assembly, the Scottish Parliament, the House of Commons, and so on. This is the BBC's "Democracy Live" website and it features gavel-to-gavel coverage of these proceedings. Visitors can use the "Featured business" link to watch some of the most current coverage, or take a look through the "Watch again" features to look over materials titled "School spending 'will increase'" and "PM confirms defence spending cuts". Further along, the site also contains a listing of all previous hearings, links to topical blogs, some historic moments in Parliament's history, and the ability to follow a representative's appearances on the BBC.

  10. 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

  11. Live! From 2-Alpha

    NSDL National Science Digital Library

    This activity is one of several in which students are required to access and analyze actual data from NASA missions, including video "interviews" with real NASA scientists, to solve a mystery. In this mystery, students learn about the force of gravity and how scientists analyze data by studying the properties of different objects in space. Live! From 2-Alpha can be used to support instruction about forces and motion, origin and evolution of the universe, and the interaction of energy and matter. This activity is one of several in "Space Mysteries," a series of inquiry-driven, interactive Web explorations. Each Mystery in "Space Mysteries" is designed to teach at least one physical science concept (e.g. interactions of energy and matter, structures and properties of matter, energy, motion, or forces), and is accompanied by materials to be used by classroom teachers.

  12. Riparian and in-stream controls on nutrient concentrations along a headwater forested stream

    NASA Astrophysics Data System (ADS)

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

    2014-07-01

    Headwater streams have a strong capacity to transform and retain nutrients, and thus, a longitudinal decrease in stream nutrient concentrations would be expected from in-stream nutrient removal alone. Yet, a number of other factors within the catchment, including biogeochemical processing within the riparian zone and export to streams, can contribute to stream nutrient concentration, which may overcome the effect of in-stream biogeochemical processing. To explore this idea, we analyzed the longitudinal patterns of stream and riparian groundwater concentrations for chloride (Cl-), nitrate (NO3-), ammonium (NH4+), and phosphate (PO43-) along a 3.7 km reach at an annual scale. The reach showed a gradual increase in stream and riparian width, riparian tree basal area, and abundance of riparian N2-fixing tree species. Concentrations of Cl- indicated a~strong hydrological connection at the riparian-stream edge. However, stream and riparian groundwater nutrient concentrations showed a moderate to null correlation, suggesting high biogeochemical processing at the riparian-stream edge and within the stream. A mass balance approach along the reach indicated that, on average, in-stream net nutrient uptake prevailed over release for NH4+ and PO43-, but not for NO3-. On an annual basis, in-stream processes contributed to change stream input fluxes by 11%, 26%, and 29% for NO3-, NH4+, and PO43-, respectively. Yet, longitudinal trends in concentration were not consistent with the prevailing in-stream biogeochem ical processes. During the riparian dormant period, stream concentration decreased along the reach for NO3-, but increased for NH4+ and PO43-. During the riparian vegetative period, NO3- and PO43- increased along the reach while NH4+ showed no clear pattern. These longitudinal trends were partially related to riparian forest features and groundwater inputs, especially for NO3- and PO43-. Our study suggests that even though in-stream biogeochemical processing was substantial, the riparian zone can modulate the longitudinal variation in stream nutrient chemistry in this headwater stream.

  13. Marine-derived nutrients, bioturbation, and ecosystem metabolism: reconsidering the role of salmon in streams.

    PubMed

    Holtgrieve, Gordon W; Schindler, Daniel E

    2011-02-01

    In coastal areas of the North Pacific Ocean, annual returns of spawning salmon provide a substantial influx of nutrients and organic matter to streams and are generally believed to enhance the productivity of recipient ecosystems. Loss of this subsidy from areas with diminished salmon runs has been hypothesized to limit ecosystem productivity in juvenile salmon rearing habitats (lakes and streams), thereby reinforcing population declines. Using five to seven years of data from an Alaskan stream supporting moderate salmon densities, we show that salmon predictably increased stream water nutrient concentrations, which were on average 190% (nitrogen) and 390% (phosphorus) pre-salmon values, and that primary producers incorporated some of these nutrients into tissues. However, benthic algal biomass declined by an order of magnitude despite increased nutrients. We also measured changes in stream ecosystem metabolic properties, including gross primary productivity (GPP) and ecosystem respiration (ER), from three salmon streams by analyzing diel measurements of oxygen concentrations and stable isotopic ratios (delta O-O2) within a Bayesian statistical model of oxygen dynamics. Our results do not support a shift toward higher primary productivity with the return of salmon, as is expected from a nutrient fertilization mechanism. Rather, net ecosystem metabolism switched from approximately net autotrophic (GPP > or = ER) to a strongly net heterotrophic state (GPP < ER) in response to bioturbation of benthic habitats by salmon. Following the seasonal arrival of salmon, GPP declined to <12% of pre-salmon rates, while ER increased by over threefold. Metabolism by live salmon could not account for the observed increase in ER early in the salmon run, suggesting salmon nutrients and disturbance enhanced in situ heterotrophic respiration. Salmon also changed the physical properties of the stream, increasing air-water gas exchange by nearly 10-fold during peak spawning. We suggest that management efforts to restore salmon ecosystems should consider effects on ecosystem metabolic properties and how salmon disturbance affects the incorporation of marine-derived nutrients into food webs. PMID:21618917

  14. 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.

  15. Stream Control Transmission Protocol Steganography

    E-print Network

    Fraczek, Wojciech; Szczypiorski, Krzysztof

    2010-01-01

    Stream Control Transmission Protocol (SCTP) is a new transport layer protocol that is due to replace TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) protocols in future IP networks. Currently, it is implemented in such operating systems like BSD, Linux, HP-UX or Sun Solaris. It is also supported in Cisco network devices operating system (Cisco IOS) and may be used in Windows. This paper describes potential steganographic methods that may be applied to SCTP and may pose a threat to network security. Proposed methods utilize new, characteristic SCTP features like multi-homing and multistreaming. Identified new threats and suggested countermeasures may be used as a supplement to RFC 5062, which describes security attacks in SCTP protocol and can induce further standard modifications.

  16. 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

  17. Describing Story Evolution from Dynamic Information Streams

    SciTech Connect

    Rose, Stuart J.; Butner, R. Scott; Cowley, Wendy E.; Gregory, Michelle L.; Walker, Julia

    2009-10-12

    Sources of streaming information, such as news syndicates, publish information continuously. Information portals and news aggregators list the latest information from around the world enabling information consumers to easily identify events in the past 24 hours. The volume and velocity of these streams causes information from prior days’ to quickly vanish despite its utility in providing an informative context for interpreting new information. Few capabilities exist to support an individual attempting to identify or understand trends and changes from streaming information over time. The burden of retaining prior information and integrating with the new is left to the skills, determination, and discipline of each individual. In this paper we present a visual analytics system for linking essential content from information streams over time into dynamic stories that develop and change over multiple days. We describe particular challenges to the analysis of streaming information and explore visual representations for showing story change and evolution over time.

  18. Galactic Streams of Cosmic-ray Electrons and Positrons

    E-print Network

    Matthew D. Kistler; Hasan Yuksel; Alexander Friedland

    2012-10-30

    Isotropy is a key assumption in many models of cosmic-ray electrons and positrons. We find that simulation results imply a critical energy of ~10-1000 GeV above which electrons and positrons can spend their entire lives in streams threading magnetic fields, due to energy losses. This would restrict the number of electron/positron sources contributing at Earth, likely leading to smooth electron and positron spectra, as is observed. For positrons, this could be as few as one, with an enhanced flux that would ease energetics concerns of a pulsar origin of the positron excess, or even zero, bringing dark matter into play. We conclude that ideas about electron/positron propagation based on either isotropic diffusion or turbulent fields must be changed.

  19. Trout stream that runs through a California coastal forest

    NSDL National Science Digital Library

    Katie Hale (CSUF; Biological Sciences)

    2007-06-08

    Streams carry sediment and nutrients from runoff but are sensitive to pollution. Organisms inhabiting streams have adaptations to hold tightly to the substrate, much like in the intertidal zone. Parts of a stream may be shaded from sunlight, limiting photosynthesis.

  20. Trout stream that runs through a California coastal forest

    NSDL National Science Digital Library

    Katie Hale (California State University, Fullerton; Student, Biological Sciences)

    2007-01-04

    Streams carry sediment and nutrients from runoff but are sensitive to pollution. Organisms inhabiting streams have adaptations to hold tightly to the substrate, much like in the intertidal zone. Parts of a stream may be shaded from sunlight, limiting photosynthesis.

  1. 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

  2. 40 CFR 434.61 - Commingling of waste streams.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 2014-07-01 false Commingling of waste streams. 434.61 Section 434.61 Protection of...Miscellaneous Provisions § 434.61 Commingling of waste streams. Where waste streams from any facility covered by this part are...

  3. 40 CFR 434.61 - Commingling of waste streams.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 2010-07-01 false Commingling of waste streams. 434.61 Section 434.61 Protection of...Miscellaneous Provisions § 434.61 Commingling of waste streams. Where waste streams from any facility covered by this part are...

  4. 40 CFR 434.61 - Commingling of waste streams.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 2012-07-01 false Commingling of waste streams. 434.61 Section 434.61 Protection of...Miscellaneous Provisions § 434.61 Commingling of waste streams. Where waste streams from any facility covered by this part are...

  5. 40 CFR 434.61 - Commingling of waste streams.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 2013-07-01 false Commingling of waste streams. 434.61 Section 434.61 Protection of...Miscellaneous Provisions § 434.61 Commingling of waste streams. Where waste streams from any facility covered by this part are...

  6. 40 CFR 434.61 - Commingling of waste streams.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 2011-07-01 false Commingling of waste streams. 434.61 Section 434.61 Protection of...Miscellaneous Provisions § 434.61 Commingling of waste streams. Where waste streams from any facility covered by this part are...

  7. 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 ...

  8. RELATING WEIGHT AND COUNT DISTRIBUTIONS OF STREAM BED GRAVEL

    EPA Science Inventory

    The size distribution of particles in a stream bed reflects the stream hydrology as well as its physical and chemical water quality characteristics. In environmental assessments, gravel distribution determines habitat quality for aquatic insects and stream suitability for spawnin...

  9. 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...

  10. Summarizing and Mining Skewed Data Streams Graham Cormode

    E-print Network

    Summarizing and Mining Skewed Data Streams Graham Cormode S. Muthukrishnan Abstract Many applications generate massive data streams. Sum- marizing such massive data requires fast, small space algo bounds. Keywords: data stream analysis, data mining, Zipf distribution, power laws, heavy hitters

  11. 40 CFR 63.1408 - Aggregate batch vent stream provisions.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 2010-07-01 true Aggregate batch vent stream provisions...AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) NATIONAL...Phenolic Resins § 63.1408 Aggregate batch vent stream provisions... Owners or operators of aggregate batch vent streams...

  12. Ebullitive methane emissions from oxygenated wetland streams.

    PubMed

    Crawford, John T; Stanley, Emily H; Spawn, Seth A; Finlay, Jacques C; Loken, Luke C; Striegl, Robert G

    2014-11-01

    Stream and river carbon dioxide emissions are an important component of the global carbon cycle. Methane emissions from streams could also contribute to regional or global greenhouse gas cycling, but there are relatively few data regarding stream and river methane emissions. Furthermore, the available data do not typically include the ebullitive (bubble-mediated) pathway, instead focusing on emission of dissolved methane by diffusion or convection. Here, we show the importance of ebullitive methane emissions from small streams in the regional greenhouse gas balance of a lake and wetland-dominated landscape in temperate North America and identify the origin of the methane emitted from these well-oxygenated streams. Stream methane flux densities from this landscape tended to exceed those of nearby wetland diffusive fluxes as well as average global wetland ebullitive fluxes. Total stream ebullitive methane flux at the regional scale (103 Mg C yr(-1) ; over 6400 km(2) ) was of the same magnitude as diffusive methane flux previously documented at the same scale. Organic-rich stream sediments had the highest rates of bubble release and higher enrichment of methane in bubbles, but glacial sand sediments also exhibited high bubble emissions relative to other studied environments. Our results from a database of groundwater chemistry support the hypothesis that methane in bubbles is produced in anoxic near-stream sediment porewaters, and not in deeper, oxygenated groundwaters. Methane interacts with other key elemental cycles such as nitrogen, oxygen, and sulfur, which has implications for ecosystem changes such as drought and increased nutrient loading. Our results support the contention that streams, particularly those draining wetland landscapes of the northern hemisphere, are an important component of the global methane cycle. PMID:24756991

  13. 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.

  14. Evaluating the reliability of the stream tracer approach to characterize stream-subsurface water exchange

    USGS Publications Warehouse

    Harvey, J.W.; Wagner, B.J.; Bencala, K.E.

    1996-01-01

    Stream water was locally recharged into shallow groundwater flow paths that returned to the stream (hyporheic exchange) in St. Kevin Gulch, a Rocky Mountain stream in Colorado contaminated by acid mine drainage. Two approaches were used to characterize hyporheic exchange: sub- reach-scale measurement of hydraulic heads and hydraulic conductivity to compute streambed fluxes (hydrometric approach) and reachscale modeling of in- stream solute tracer injections to determine characteristic length and timescales of exchange with storage zones (stream tracer approach). Subsurface data were the standard of comparison used to evaluate the reliability of the stream tracer approach to characterize hyporheic exchange. The reach-averaged hyporheic exchange flux (1.5 mL s-1 m-1), determined by hydrometric methods, was largest when stream base flow was low (10 L s-1); hyporheic exchange persisted when base flow was 10- fold higher, decreasing by approximately 30%. Reliability of the stream tracer approach to detect hyporheic exchange was assessed using first- order uncertainty analysis that considered model parameter sensitivity. The stream tracer approach did not reliably characterize hyporheic exchange at high base flow: the model was apparently more sensitive to exchange with surface water storage zones than with the hyporheic zone. At low base flow the stream tracer approach reliably characterized exchange between the stream and gravel streambed (timescale of hours) but was relatively insensitive to slower exchange with deeper alluvium (timescale of tens of hours) that was detected by subsurface measurements. The stream tracer approach was therefore not equally sensitive to all timescales of hyporheic exchange. We conclude that while the stream tracer approach is an efficient means to characterize surface-subsurface exchange, future studies will need to more routinely consider decreasing sensitivities of tracer methods at higher base flow and a potential bias toward characterizing only a fast component of hyporheic exchange. Stream tracer models with multiple rate constants to consider both fast exchange with streambed gravel and slower exchange with deeper alluvium appear to be warranted.

  15. 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.

  16. Predator avoidance during reproduction: diel movements by spawning sockeye salmon between stream and lake habitats.

    PubMed

    Bentley, Kale T; Schindler, Daniel E; Cline, Timothy J; Armstrong, Jonathan B; Macias, Daniel; Ciepiela, Lindsy R; Hilborn, Ray

    2014-11-01

    Daily movements of mobile organisms between habitats in response to changing trade-offs between predation risk and foraging gains are well established; however, less in known about whether similar tactics are used during reproduction, a time period when many organisms are particularly vulnerable to predators. We investigated the reproductive behaviour of adult sockeye salmon (Oncorhynchus nerka) and the activity of their principal predator, brown bears (Ursus arctos), on streams in south-western Alaska. Specifically, we continuously monitored movements of salmon between lake habitat, where salmon are invulnerable to bears, and three small streams, where salmon spawn and are highly vulnerable to bears. We conducted our study across 2 years that offered a distinct contrast in bear activity and predation rates. Diel movements by adult sockeye salmon between stream and lake habitat were observed in 51·3% ± 17·7% (mean ± SD) of individuals among years and sites. Fish that moved tended to hold in the lake for most of the day and then migrated into spawning streams during the night, coincident with when bear activity on streams tended to be lowest. Additionally, cyclic movements between lakes and spawning streams were concentrated earlier in the spawning season. Individuals that exhibited diel movements had longer average reproductive life spans than those who made only one directed movement into a stream. However, the relative effect was dependent on the timing of bear predation, which varied between years. When predation pressure primarily occurred early in the spawning run (i.e., during the height of the diel movements), movers lived 120-310% longer than non-movers. If predation pressure was concentrated later in the spawning run (i.e. when most movements had ceased), movers only lived 10-60% longer. Our results suggest a dynamic trade-off in reproductive strategies of sockeye salmon; adults must be in the stream to reproduce, but must also avoid predation long enough to spawn. Given the interannual variation in the timing and intensity of predation pressure, the advantages of a particular movement strategy will likely vary among years. Regardless, movements by salmon allowed individuals to exploit fine-scale habitat heterogeneity during reproduction, which appears to be a strategy to reduce predation risk on the spawning grounds. PMID:24702169

  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. 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).…

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

    E-print Network

    Luther, Douglas S.

    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

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

    E-print Network

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