Sample records for powerful search engines

  1. Federated Search in the Wild The Combined Power of over a Hundred Search Engines

    E-print Network

    Hiemstra, Djoerd

    Federated Search in the Wild The Combined Power of over a Hundred Search Engines Dong Nguyen1}@cs.utwente.nl ABSTRACT Federated search has the potential of improving web search: the user becomes less dependent Keywords Federated search, distributed information retrieval, evalua- tion, dataset, test collection, web

  2. Search Engines

    Microsoft Academic Search

    Rustam Al-Shahi

    2001-01-01

    If you want to find anything on the World Wide Web (WWW), you need to know about search engines. Hitherto, both Internet sceptics and ‘technophobes’ have criticised the various search engines for having the same failings as the WWW itself: that the overall quality and relevance of sites are poor. After all, what search engines retrieve for you is merely

  3. Search Engine Watch

    NSDL National Science Digital Library

    Search Engine Watch is a resource designed to provide information to two distinct groups of users: web professionals (commercial webmasters, site designers and promoters), and web searchers. The Webmaster's Guide to Search Engines contains information on search engine design, ranking, and tips on how to make sure your site receives a high relevance rating. Search Engine Facts and Fun contains information on the major search services and links to selected search engine tutorials and ratings articles, among other features.

  4. Modeling search engine effectiveness for federated search

    Microsoft Academic Search

    Luo Si; Jamie Callan

    2005-01-01

    Federated search links multiple search engines into a single, virtual search system. Most prior research of federated search focused on selecting search engines that have the most relevant contents, but ignored the retrieval effectiveness of individual search engines. This omission can cause serious problems when federating search engines of different qualities.This paper proposes a federated search technique that uses utility

  5. Geoscience Job Search Engine

    NSDL National Science Digital Library

    The Scripps Institution of Oceanography at the University of California, San Diego provides the Geoscience Job Search Engine. The search engine lists academic, industry, and student opportunities in the US and other countries. Searchable fields range from aqueous geochemistry to environmental engineering to volcanology.

  6. CatS: A Classification-Powered Meta-Search Engine Milos Radovanovic and Mirjana Ivanovic

    E-print Network

    Radovanovich, Milos

    of the system (including HTML parsing, classification and displaying of results), outlines the text the system into the context of related work on (meta-)search engines. The approach of using a separate cate- gory tree represents an extension of the standard relevance list, and provides a way to refine

  7. Search Engine Showdown

    NSDL National Science Digital Library

    Created and maintained by Greg Notess, author of Government Information on the Internet and a columnist in Online and Database, this site offers reviews, analysis, statistics, and strategies for many of the major search engines. Organized in four primary sections (Features, Analysis, Learning, News & Talk) the site explores topics such as search engine database size and capabilities, searching for Usenet and phone number information, subject guides, multiple search engines, and tips on successful searching. The site appear to be regularly updated and additional resources include a newsletter, which users may subscribe to at the site.

  8. Internet Search Engines

    NSDL National Science Digital Library

    If you are reading this Internet Scout report, you most likely have used a search engine before and may have wondered what makes some websites show up on Google and others not. This Topic in Depth provides some background information on search engines. The first website from Webopedia gives an overview of how search engines work (1) provides more information on the mechanics of search engines and debunks some common myths. If any terms used in the article are new to you, this website (3) offers a thesauras of key terms along with tips to help you improve your chances of getting your website to show up on search engines. This brief history from Web Reference (4) provides some perspective on how the technology began, while this article (5) gives some basic information on where we are today with search engine usage and technology. Search Engine Watch offers this listing of kids search engines (6). The University at Albany 7) offers a list of suggestions on how to choose a website for various uses and searching preferences.

  9. Search Engine Meeting Report

    NSDL National Science Digital Library

    The Fifth Annual Search Engine Meeting was held in Boston, April 10-11, and Chris Sherman, author of the About.com Guide to Web Search (see the December 3, 1999 Scout Report), was in attendance. His detailed, five-part report covers the most important presentations and panel discussions featured at the conference, including Danny Sullivan's State of the Search Engines Report, a talk by Inktomi co-founder Eric Brewer, reports on MSN Search and FAST, a look into the future of intelligent agents, and a spirited panel presentation and open discussion between the chief technologists of the major engines and members of the audience.

  10. Custom Search Engines: Tools & Tips

    ERIC Educational Resources Information Center

    Notess, Greg R.

    2008-01-01

    Few have the resources to build a Google or Yahoo! from scratch. Yet anyone can build a search engine based on a subset of the large search engines' databases. Use Google Custom Search Engine or Yahoo! Search Builder or any of the other similar programs to create a vertical search engine targeting sites of interest to users. The basic steps to…

  11. USGS Search Engine

    NSDL National Science Digital Library

    Users can search the large number of the U.S. Geological Survey's web pages with this engine. In addition to the search box (where a key word or title can be typed), the search is further refined by the incorporation of links to categories of topics. The topics consist of resource types such as Fact Sheets or Maps, subjects such as minerals or water quality, or an organizational search on USGS State offices or programs.

  12. Power law scaling for the adiabatic algorithm for search engine ranking

    E-print Network

    Frees, Adam; Rudinger, Kenneth; Bach, Eric; Friesen, Mark; Joynt, Robert; Coppersmith, S N

    2012-01-01

    An important method for search engine result ranking works by finding the principal eigenvector of the "Google matrix." Recently, a quantum algorithm for this problem and evidence of an exponential speedup for some scale-free networks were presented. Here, we show that the run-time depends on features of the graphs other than the degree distribution, and can be altered sufficiently to rule out a general exponential speedup. For a sample of graphs with degree distributions that more closely resemble the Web than in previous work, the proposed algorithm does not appear to run exponentially faster than the classical case.

  13. Power law scaling for the adiabatic algorithm for search engine ranking

    E-print Network

    Adam Frees; John King Gamble; Kenneth Rudinger; Eric Bach; Mark Friesen; Robert Joynt; S. N. Coppersmith

    2012-12-05

    An important method for search engine result ranking works by finding the principal eigenvector of the "Google matrix." Recently, a quantum algorithm for preparing this eigenvector and evidence of an exponential speedup for some scale-free networks were presented. Here, we show that the run-time depends on features of the graphs other than the degree distribution, and can be altered sufficiently to rule out a general exponential speedup. For a sample of graphs with degree distributions that more closely resemble the Web than in previous work, the proposed algorithm for eigenvector preparation does not appear to run exponentially faster than the classical case.

  14. NEW FACULTY SEARCHES IN MECHANICAL ENGINEERING

    E-print Network

    for nuclear engineering include, but are not limited to: nuclear power and science, reactor physics, nuclearNEW FACULTY SEARCHES IN MECHANICAL ENGINEERING AND NUCLEAR ENGINEERING The Department of Mechanical and Nuclear Engineering at The Pennsylvania State University is pleased to announce a significant growth

  15. Power law scaling for the adiabatic algorithm for search engine ranking

    NASA Astrophysics Data System (ADS)

    Frees, Adam; King Gamble, John; Rudinger, Kenneth; Bach, Eric; Friesen, Mark; Joynt, Robert; Coppersmith, S. N.

    2013-03-01

    An important method for search engine result ranking works by finding the principal eigenvector of the ``Google matrix.'' Recently, a quantum algorithm for this problem and evidence of an exponential speedup for some scale-free networks were presented. Here, we show that the run-time depends on features of the graphs other than the degree distribution, and can be altered sufficiently to rule out a general exponential speedup. For a sample of graphs with degree distributions that more closely resemble the Web than in the previous work, the proposed algorithm does not appear to run exponentially faster than the classical one. An important method for search engine result ranking works by finding the principal eigenvector of the ``Google matrix.'' Recently, a quantum algorithm for this problem and evidence of an exponential speedup for some scale-free networks were presented. Here, we show that the run-time depends on features of the graphs other than the degree distribution, and can be altered sufficiently to rule out a general exponential speedup. For a sample of graphs with degree distributions that more closely resemble the Web than in the previous work, the proposed algorithm does not appear to run exponentially faster than the classical one. This work was supported in part by ARO, DOD (W911NF-09-1-0439) and NSF (CCR-0635355, DMR 0906951). A.F. acknowledges support from the NSF REU program (PHY-PIF-1104660)

  16. Search Engine Liability for Copyright Infringement

    NASA Astrophysics Data System (ADS)

    Fitzgerald, B.; O'Brien, D.; Fitzgerald, A.

    The chapter provides a broad overview to the topic of search engine liability for copyright infringement. In doing so, the chapter examines some of the key copyright law principles and their application to search engines. The chapter also provides a discussion of some of the most important cases to be decided within the courts of the United States, Australia, China and Europe regarding the liability of search engines for copyright infringement. Finally, the chapter will conclude with some thoughts for reform, including how copyright law can be amended in order to accommodate and realise the great informative power which search engines have to offer society.

  17. Power-law scaling for the adiabatic algorithm for search-engine ranking

    NASA Astrophysics Data System (ADS)

    Frees, Adam; Gamble, John King; Rudinger, Kenneth; Bach, Eric; Friesen, Mark; Joynt, Robert; Coppersmith, S. N.

    2013-09-01

    An important method for search engine result ranking works by finding the principal eigenvector of the “Google matrix.” Recently, a quantum algorithm for generating this eigenvector as a quantum state was presented, with evidence of an exponential speedup of this process for some scale-free networks. Here we show that the run time depends on features of the graphs other than the degree distribution, and can be altered sufficiently to rule out a general exponential speedup. According to our simulations, for a sample of graphs with degree distributions that are scale-free, with parameters thought to closely resemble the Web, the proposed algorithm for eigenvector preparation does not appear to run exponentially faster than the classical case.

  18. Search Engine Guide

    NSDL National Science Digital Library

    This massive metasite should keep even the most hardcore search engine junkie busy, with over 2,200 briefly annotated links to search engines, portals, directories, and indexes. The links are organized under twelve subject headings, such as Arts, Business, Reference, Social Science, and Government, which are further broken down by topic. What's New, What's Cool, and Top 10 lists are also provided. In addition, users can track new listings by subscribing to a free email update service. While there were a few holes here and there, the sheer size of this site and the frequent updates make it a valuable resource for users on the hunt for a specialized directory or those who like to keep track of new search engines.

  19. DATA SEARCH ENGINE INTRODUCTION

    E-print Network

    Meng, Weiyi

    are performed every day. The Web consists of the Surface Web and the Deep Web (Hidden Web or Invisible Web of a page allows the page to be fetched directly. In contrast, the Deep Web contains pages that cannotD DATA SEARCH ENGINE INTRODUCTION The World Wide Web was first developed by Tim Berners- Lee

  20. MOBILE SEARCH ENGINE SURVEY

    Microsoft Academic Search

    Lauri Kolmonen

    The immense amount of information available on the Internet makes it virtually impossible to find relevant information just by following links from page to another. Because of this, the search engines have become commonplace entry points to Internet in desktop use, shaping the way we browse the Internet by the result they provide. Advertisement based revenue models, that is, displaying

  1. Video Search Engine

    NSDL National Science Digital Library

    1998-01-01

    Virage and AltaVista have combined to launch the first video search engine available on the Web. Using new technology that watches, listens, and reads videos, the Virage Video Cataloger automatically extracts relevant information to create searchable indexes in real-time. This breakthrough technology has been adapted for the Internet, allowing users to search video files by keyword and view selected segments. The experimental Web version of this technology, available at AltaVista, currently features four hours of President Clinton's video testimony to a grand jury last month.

  2. Federated Search of Text Search Engines in Uncooperative Environments

    E-print Network

    Eskenazi, Maxine

    i Federated Search of Text Search Engines in Uncooperative Environments Luo Si Language Technology..............................................................................................................1 1.2 Federated search .....................................................................................................................3 1.3 Applications of federated search

  3. Web Search Studies: Multidisciplinary Perspectives on Web Search Engines

    NASA Astrophysics Data System (ADS)

    Zimmer, Michael

    Perhaps the most significant tool of our internet age is the web search engine, providing a powerful interface for accessing the vast amount of information available on the world wide web and beyond. While still in its infancy compared to the knowledge tools that precede it - such as the dictionary or encyclopedia - the impact of web search engines on society and culture has already received considerable attention from a variety of academic disciplines and perspectives. This article aims to organize a meta-discipline of “web search studies,” centered around a nucleus of major research on web search engines from five key perspectives: technical foundations and evaluations; transaction log analyses; user studies; political, ethical, and cultural critiques; and legal and policy analyses.

  4. Abstract --This panel session paper outlines one of the re-search thrust areas in the Power System Engineering Research

    E-print Network

    Oren, Shmuel S.

    - tions of sustainable energy systems. The proposed research under this thrust area aims at understanding, largely, by environmental regulation aimed at promoting sustainable energy resources and reducing carbon1 Abstract -- This panel session paper outlines one of the re- search thrust areas in the Power

  5. Space Power Engineering Problems

    Microsoft Academic Search

    V. P. Senkevich

    2002-01-01

    Development of space power engineering in the first half of XXI century shall be aimed at preventing the forthcoming energy crisis and ecological catastrophes. The problem can be solved through using solar energy being perpetual, endless, and ecologically safe. As of now, issues on the development and employment of solar power stations and its beaming to the ground stations in

  6. Start Your Engines: Surfing with Search Engines for Kids.

    ERIC Educational Resources Information Center

    Byerly, Greg; Brodie, Carolyn S.

    1999-01-01

    Suggests that to be an effective educator and user of the Web it is essential to know the basics about search engines. Presents tips for using search engines. Describes several search engines for children and young adults, as well as some general filtered search engines for children. (AEF)

  7. Estimating the Usefulness of Search Engines

    Microsoft Academic Search

    Weiyi Meng; King-lup Liu; Clement T. Yu; Wensheng Wu; N. Naphtali Rishe

    1999-01-01

    In this paper, we present a statistical method to estimatethe usefulness of a search engine for any givenquery. The estimates can be used by a metasearch engineto choose local search engines to invoke. For agiven query, the usefulness of a search engine in thispaper is defined to be a combination of the numberof documents in the search engine that are

  8. Stirling engine power control

    DOEpatents

    Fraser, James P. (Scotia, NY)

    1983-01-01

    A power control method and apparatus for a Stirling engine including a valved duct connected to the junction of the regenerator and the cooler and running to a bypass chamber connected between the heater and the cylinder. An oscillating zone of demarcation between the hot and cold portions of the working gas is established in the bypass chamber, and the engine pistons and cylinders can run cold.

  9. Conceptual Models for Search Engines

    NASA Astrophysics Data System (ADS)

    Hendry, D. G.; Efthimiadis, E. N.

    Search engines have entered popular culture. They touch people in diverse private and public settings and thus heighten the importance of such important social matters as information privacy and control, censorship, and equitable access. To fully benefit from search engines and to participate in debate about their merits, people necessarily appeal to their understandings for how they function. In this chapter we examine the conceptual understandings that people have of search engines by performing a content analysis on the sketches that 200 undergraduate and graduate students drew when asked to draw a sketch of how a search engine works. Analysis of the sketches reveals a diverse range of conceptual approaches, metaphors, representations, and misconceptions. On the whole, the conceptual models articulated by these students are simplistic. However, students with higher levels of academic achievement sketched more complete models. This research calls attention to the importance of improving students' technical knowledge of how search engines work so they can be better equipped to develop and advocate policies for how search engines should be embedded in, and restricted from, various private and public information settings.

  10. Search Engine Optimization: SEO Book

    NSDL National Science Digital Library

    Wall, Aaron

    The strange and wondrous ways in which search engines gather their indexes is made a little clearer in this tutorial. Written by a web designer disappointed with how difficult his pages were to find with the standard search engines, this page gives insight into how Infoseek, Lycos, Alta Vista, Excite, Web Crawler, and Open Text catalog web pages. The search strategy of each engine is described, along with tips for how web designers can increase their site's chances of being among the hits returned when users enter relevant search criteria. Although indexing algorithms are constantly being updated, this site presents common-sense guidelines that web designers interested in reaching a wider audience will find useful.

  11. Mining Templates from Search Result Records of Search Engines

    E-print Network

    Meng, Weiyi

    -shopping and Deep Web crawling applications need to extract search result records enwrapped in result pages returned web applications require automatic extraction of SRRs from search engine result pages, such as deep search engines that search web pages or other text documents and the second is Web databases that search

  12. The UI issues for the search engine

    Microsoft Academic Search

    Shih-Ting Huang; Tsai-hsuan Tsai; Hsien-tsung Chang

    2009-01-01

    According to Internet World Stats and EUROPA, ldquouse search enginerdquo is the highest proportion of Internet individual activities. Therefore, despite functions, databases and technology update of search engine development, it should be considered the usability, operation, and user behavior. This article explore from the development process of the Web and search engines, and summarized the current search engine interface, as

  13. Index Terms --Smart grid; power engineering education; power engineering curriculum; power engineering re-

    E-print Network

    1 Index Terms -- Smart grid; power engineering education; power engineering curriculum; power the United States power system has led to an engineering initiative va- riously known as `smart grid the smart grid will be educated, how they should be trained, and to what levels of comprehension

  14. Using Search Engines on the World Wide Web and Where to Find Search Engine Help.

    ERIC Educational Resources Information Center

    Jones, Thea

    1997-01-01

    Explains search engines that are used on the World Wide Web to find information on the Internet. Highlights include eight search engines with information on how to find the help screen; four "spiders" that conduct searches of several search engines; and four online sites for learning more about using search engines. (LRW)

  15. Federated search of text search engines in uncooperative environments

    Microsoft Academic Search

    Luo Si

    2007-01-01

    Conventional search engines like Google provide access to Web information that can be acquired easily by crawling hyperlinks. However, a large amount of information cannot be copied arbitrarily by conventional search engines. This type of hidden information, which is very valuable, can only be accessed via an alternative search model other than the centralized retrieval model used by conventional search

  16. Space Power Engineering Problems

    NASA Astrophysics Data System (ADS)

    Senkevich, V. P.

    2002-01-01

    Development of space power engineering in the first half of XXI century shall be aimed at preventing the forthcoming energy crisis and ecological catastrophes. The problem can be solved through using solar energy being perpetual, endless, and ecologically safe. As of now, issues on the development and employment of solar power stations and its beaming to the ground stations in the SHF band are put on the agenda. The most pressing problem is to develop orbital solar reflectors to illuminate towns in the polar regions, agricultural regions, and areas of processing sea products. Space-based technologies can be used to deal with typhoons, green house effects, and "ozone holes". Recently, large, frameless film structures formed by centrifugal forces offer the promise of structures for orbital power plants, reflectors, and solar sails. A big success is achieved in the development of power generating solar array elements of amorphous silicon. These innovations would make the development of orbital solar power plants dozens of times cheaper. Such solar arrays shall be used in the nearest future on heavy communication satellites and the Earth remote sensing platforms for generation of 140-160 kW at a specific power beyond 300 W/kg. The cargo traffic needed to develop and maintain the orbital power plants and reflector systems could be equipped with solar sails as the future low thrust propulsion. In 2000, the mankind witnessed an unexpected beginning of energy crisis along with strong hydro- meteorological events (typhoons, floods) that shocked the USA, the Western Europe, England, Japan, and other countries. The total damage is estimated as 90 billions of dollars. The mankind is approaching a boundary beyond which its further existence would depend on how people would learn to control weather and use ecologically safe power sources. Space technology base on the research potential accumulated in the previous century could serve for the solution of this problem.

  17. Web Search Engines: (More) Features and Commands.

    ERIC Educational Resources Information Center

    Hock, Randolph

    2000-01-01

    Provides a summary look at the features provided by nine major World Wide Web search engines. Examines size, Boolean operators, phrase searching capabilities, media searching, format options, and special features. (LRW)

  18. AGORA: A Search Engine for Software Components

    Microsoft Academic Search

    Robert C. Seacord; Scott A. Hissam; Kurt C. Wallnau

    1998-01-01

    Using JavaBeans and CORBA agents in conjunction with Web search technologies, this prototype search engine (Agora), automatically generates and indexes a worldwide database of software products, classified by component model. Users of Agora can search for components in this database by describing specific properties of a component's interface. The system combines Web search engines with an introspection process. Introspection, primarily

  19. Introduction to Video Search Engines Tutorial Notes

    E-print Network

    Fisher, Kathleen

    , education, medical, industrial, scientific, law enforcement, legal, surveillance. Challenges of video search1 Introduction to Video Search Engines Tutorial Notes WWW 2006 David C. Gibbon Abstract: The emergence of video search engines on major web search portals and market forces such as IPTV and mobile

  20. Curriculum improvements in power engineering

    Microsoft Academic Search

    Efraín O'Neill-Carrillo; Agustín Irizarry-Rivera; Miguel Vélez-Reyes

    2001-01-01

    The Power Engineering Group at the University of Puerto Rico-Mayaguez (UPRM) has implemented several strategies to improve its curriculum and meet new ABET accreditation criteria. Strategies include the revision of course contents, integration of laboratory practices to courses, and a more prominent role of undergraduate research and power electronics in the power engineering curriculum. Courses are being updated to include

  1. NASA Indexing Benchmarks: Evaluating Text Search Engines

    NASA Technical Reports Server (NTRS)

    Esler, Sandra L.; Nelson, Michael L.

    1997-01-01

    The current proliferation of on-line information resources underscores the requirement for the ability to index collections of information and search and retrieve them in a convenient manner. This study develops criteria for analytically comparing the index and search engines and presents results for a number of freely available search engines. A product of this research is a toolkit capable of automatically indexing, searching, and extracting performance statistics from each of the focused search engines. This toolkit is highly configurable and has the ability to run these benchmark tests against other engines as well. Results demonstrate that the tested search engines can be grouped into two levels. Level one engines are efficient on small to medium sized data collections, but show weaknesses when used for collections 100MB or larger. Level two search engines are recommended for data collections up to and beyond 100MB.

  2. Reconfigurable Search Engine for Exploiting Search Knowledge

    Microsoft Academic Search

    Koji Zettsu; Katsumi Tanaka

    2006-01-01

    We propose an approach for sharing and exploiting search knowledge (i.e., search skills or know-how) throughout a community of users. This is achieved by making a search process reconfigurable according to the search knowledge. We define the following categories of software components comprising a search process: information source, retrieval, analysis, and cataloging. We are able to develop this search process

  3. SPELLING CORRECTION IN THE PUBMED SEARCH ENGINE.

    PubMed

    Wilbur, W John; Kim, Won; Xie, Natalie

    2006-11-01

    It is known that users of internet search engines often enter queries with misspellings in one or more search terms. Several web search engines make suggestions for correcting misspelled words, but the methods used are proprietary and unpublished to our knowledge. Here we describe the methodology we have developed to perform spelling correction for the PubMed search engine. Our approach is based on the noisy channel model for spelling correction and makes use of statistics harvested from user logs to estimate the probabilities of different types of edits that lead to misspellings. The unique problems encountered in correcting search engine queries are discussed and our solutions are outlined. PMID:18080004

  4. Children's Search Engines from an Information Search Process Perspective.

    ERIC Educational Resources Information Center

    Broch, Elana

    2000-01-01

    Describes cognitive and affective characteristics of children and teenagers that may affect their Web searching behavior. Reviews literature on children's searching in online public access catalogs (OPACs) and using digital libraries. Profiles two Web search engines. Discusses some of the difficulties children have searching the Web, in the…

  5. A search engine for natural language applications

    Microsoft Academic Search

    Michael J. Cafarella; Oren Etzioni

    2005-01-01

    Many modern natural language-processing applications utilize search engines to locate large numbers of Web documents or to compute statistics over the Web corpus. Yet Web search engines are designed and optimized for simple human queries---they are not well suited to support such applications. As a result, these applications are forced to issue millions of successive queries resulting in unnecessary search

  6. Internet Search Engines - Fluctuations in Document Accessibility.

    ERIC Educational Resources Information Center

    Mettrop, Wouter; Nieuwenhuysen, Paul

    2001-01-01

    Reports an empirical investigation of the consistency of retrieval through Internet search engines. Evaluates 13 engines: AltaVista, EuroFerret, Excite, HotBot, InfoSeek, Lycos, MSN, NorthernLight, Snap, WebCrawler, and three national Dutch engines: Ilse, Search.nl and Vindex. The focus is on a characteristic related to size: the degree of…

  7. Semantic Routed Network for Distributed Search Engines

    E-print Network

    Biswas, Amitava

    2011-08-08

    to compare composite meanings for superior search quality. In distributed search engines, for scalability, speed and efficiency, index entries should be systematically distributed across multiple index-server nodes based on the meaning of the objects...

  8. Improving product review search experiences on general search engines

    Microsoft Academic Search

    Shen Huang; Dan Shen; Wei Feng; Catherine Baudin; Yongzheng Zhang

    2009-01-01

    In the Web 2.0 era, internet users contribute a large amount of online content. Product review is a good example. Since these phenomena are distributed all over shopping sites, weblogs, forums etc., most people have to rely on general search engines to discover and digest others' comments. While conventional search engines work well in many situations, it's not sufficient for

  9. Job Search: Regional/Quality Job Search Engines

    E-print Network

    Carter, John

    Resources Job Search: Regional/Quality Job Search Engines Bellevue College: http://bellevuecollege.edu/careers/sac_general.html#searchengines PNW Job Board: https://services.philanthropynw.org/jobbank/ ColorsNW Job Bank: http://jobs.colorscareers.com/c/search_results.cfm?site_id=1919 Seattle Jobs: http://www.seattlejobs.com/ WorkSource Seattle-King County: http

  10. Job Search: Regional/Quality Job Search Engines

    E-print Network

    Carter, John

    Job Search: Regional/Quality Job Search Engines Bellevue College: http://bellevuecollege.edu/careers/sac_general.html#searchengines PNW Job Board: https://services.philanthropynw.org/jobbank/ ColorsNW Job Bank: http://jobs.colorscareers.com/c/search_results.cfm?site_id=1919 Seattle Jobs: http://www.seattlejobs.com/ WorkSource Seattle-King County: http

  11. MEMS Rotary Engine Power System

    NASA Astrophysics Data System (ADS)

    Fernandez-Pello, A. Carlos; Pisano, Albert P.; Fu, Kelvin; Walther, David C.; Knobloch, Aaron; Martinez, Fabian; Senesky, Matt; Stoldt, Conrad; Maboudian, Roya; Sanders, Seth; Liepmann, Dorian

    This work presents a project overview and recent research results for the MEMS Rotary Engine Power System project at the Berkeley Sensor & Actuator Center of the University of California at Berkeley. The research motivation for the project is the high specific energy density of hydrocarbon fuels. When compared with the energy density of batteries, hydrocarbon fuels may have as much as 20x more energy. However, the technical challenge is the conversion of hydrocarbon fuel to electricity in an efficient and clean micro engine. A 12.9 mm diameter Wankel engine will be shown that has already generated 4 Watts of power at 9300rpm. In addition, the 1mm and 2.4 mm Wankel engines that BSAC is developing for power generation at the microscale will be discussed. The project goal is to develop electrical power output of 90milliwatts from the 2.4 mm engine. Prototype engine components have already been fabricated and these will be described. The integrated generator design concept utilizes a nickel-iron alloy electroplated in the engine rotor poles, so that the engine rotor also serves as the generator rotor.

  12. Multiple language supports in search engines

    Microsoft Academic Search

    Jin Zhang; Suyu Lin

    2007-01-01

    Purpose – This paper aims to investigate the multiple language support features in internet search engines. The diversity of the internet is reflected not only in its users, information formats and information content, but also in the languages used. As more and more information becomes available in different languages, multiple language support in a search engine becomes more important. Design\\/methodology\\/approach

  13. Web impact factors and search engine coverage

    Microsoft Academic Search

    Mike Thelwall

    2000-01-01

    Search engines index only a proportion of the web and this proportion is not determined randomly but by following algorithms that take into account the properties that impact factors measure. A survey was conducted in order to test the coverage of search engines and to decide whether their partial coverage is indeed an obstacle to using them to calculate web

  14. Steam electric power generation: Technology and environmental impact. (Latest citations from Information Services in Mechanical Engineering database). Published Search

    SciTech Connect

    NONE

    1995-02-01

    The bibliography contains citations concerning the technology and environmental impact of steam electric power generation. Plant operation, control, heating and cooling systems, pollution and noise control, and environmental protection are discussed. Economic analyses of plant operation, plant management, energy conservation measures, and modeling and computational techniques are presented. (Contains a minimum of 188 citations and includes a subject term index and title list.)

  15. Modeling Search Engine Effectiveness for Federated Search Luo Si and Jamie Callan

    E-print Network

    Callan, Jamie

    Modeling Search Engine Effectiveness for Federated Search Luo Si and Jamie Callan School Federated search links multiple search engines into a single, virtual search system. Most prior research of federated search focused on selecting search engines that have the most relevant contents, but ignored

  16. Distributed search engine architecture based on topic specific searches

    NASA Astrophysics Data System (ADS)

    Abudaqqa, Yousra; Patel, Ahmed

    2015-05-01

    Indisputably, search engines (SEs) abound. The monumental growth of users performing online searches on the Web is a contending issue in the contemporary world nowadays. For example, there are tens of billions of searches performed everyday, which typically offer the users many irrelevant results which are time consuming and costly to the user. Based on the afore-going problem it has become a herculean task for existing Web SEs to provide complete, relevant and up-to-date information response to users' search queries. To overcome this problem, we developed the Distributed Search Engine Architecture (DSEA), which is a new means of smart information query and retrieval of the World Wide Web (WWW). In DSEAs, multiple autonomous search engines, owned by different organizations or individuals, cooperate and act as a single search engine. This paper includes the work reported in this research focusing on development of DSEA, based on topic-specific specialised search engines. In DSEA, the results to specific queries could be provided by any of the participating search engines, for which the user is unaware of. The important design goal of using topic-specific search engines in the research is to build systems that can effectively be used by larger number of users simultaneously. Efficient and effective usage with good response is important, because it involves leveraging the vast amount of searched data from the World Wide Web, by categorising it into condensed focused topic -specific results that meet the user's queries. This design model and the development of the DSEA adopt a Service Directory (SD) to route queries towards topic-specific document hosting SEs. It displays the most acceptable performance which is consistent with the requirements of the users. The evaluation results of the model return a very high priority score which is associated with each frequency of a keyword.

  17. Faculty Search Materials Science and Engineering

    E-print Network

    Buehrer, R. Michael

    University The Department of Materials Science and Engineering (MSE) at Virginia Tech seeks applicationsFaculty Search Materials Science and Engineering Virginia Polytechnic Institute and State degree or equivalent in a relevant area of materials science and engineering is required. The successful

  18. The influence of search engines on preferential attachment Alan Frieze

    E-print Network

    Frieze, Alan

    Abstract There is much current interest in the evolution of social networks, in particular, the Web graph the observed power-law degree distribution of the Web graph reasonably well. However, existing evolution models do not include the significant influence of search engines on how Web page authors find existing

  19. Power control for heat engines

    DOEpatents

    Dineen, John J. (Durham, NH)

    1984-01-01

    A power control arrangement for a Stirling engine includes a sleeve mounted in each cylinder for axial movement and a port in the sleeve leading to a dead space. The port is covered by the piston at a position that is determined by the piston position and the axial adjustment of the sleeve. The compression phase of the Stirling cycle for that piston begins when the port is covered, so the position of the sleeve is used to set the Stirling engine power level.

  20. Automated Mechanism Design for Large Instances of Federated Search Engines

    E-print Network

    Gatti, Nicola

    Automated Mechanism Design for Large Instances of Federated Search Engines Francesco Trov in a search engine web page. In particular, Federated Search Engine auctions are challenging with respect setting named Federated Search Engines (FSE), since it is particularly challenging on the MD point of view

  1. Deep-web search engine ranking algorithms

    E-print Network

    Wong, Brian Wai Fung

    2010-01-01

    The deep web refers to content that is hidden behind HTML forms. The deep web contains a large collection of data that are unreachable by link-based search engines. A study conducted at University of California, Berkeley ...

  2. MEMS Rotary Engine Power System

    Microsoft Academic Search

    A. Carlos Fernandez-Pello; Albert P. Pisano; Kelvin Fu; David C. Walther; Aaron Knobloch; Fabian Martinez; Matt Senesky; Conrad Stoldt; Roya Maboudian; Seth Sanders; Dorian Liepmann

    2003-01-01

    This work presents a project overview and recent research results for the MEMS Rotary Engine Power System project at the Berkeley Sensor & Actuator Center of the University of California at Berkeley. The research motivation for the project is the high specific energy density of hydrocarbon fuels. When compared with the energy density of batteries, hydrocarbon fuels may have as

  3. Department of Mechanical, Materials and Aerospace Engineering Department Chair Search

    E-print Network

    Saniie, Jafar

    Engineering, Materials Engineering and Aerospace Engineering. Advanced degrees at the MS and Ph.D. levelDepartment of Mechanical, Materials and Aerospace Engineering Department Chair Search The Illinois, Department of Mechanical, Materials and Aerospace Engineering (MMAE) (http

  4. Combining Search Engines for Comparative Proteomics

    PubMed Central

    Tabb, David

    2012-01-01

    Many proteomics laboratories have found spectral counting to be an ideal way to recognize biomarkers that differentiate cohorts of samples. This approach assumes that proteins that differ in quantity between samples will generate different numbers of identifiable tandem mass spectra. Increasingly, researchers are employing multiple search engines to maximize the identifications generated from data collections. This talk evaluates four strategies to combine information from multiple search engines in comparative proteomics. The “Count Sum” model pools the spectra across search engines. The “Vote Counting” model combines the judgments from each search engine by protein. Two other models employ parametric and non-parametric analyses of protein-specific p-values from different search engines. We evaluated the four strategies in two different data sets. The ABRF iPRG 2009 study generated five LC-MS/MS analyses of “red” E. coli and five analyses of “yellow” E. coli. NCI CPTAC Study 6 generated five concentrations of Sigma UPS1 spiked into a yeast background. All data were identified with X!Tandem, Sequest, MyriMatch, and TagRecon. For both sample types, “Vote Counting” appeared to manage the diverse identification sets most effectively, yielding heightened discrimination as more search engines were added.

  5. Teaching a Music Search Engine Through Play

    Microsoft Academic Search

    Bryan Pardo; David A. Shamma

    2007-01-01

    Systems able to find a song based on a sung, hummed, or whistled melody are called Query-By-Humming (QBH) systems. We propose an approach to improve search performance of a QBH system based on data collected from an online social music game, Karaoke Callout. Users of Karaoke Callout generate training data for the search engine, allowing both ongoing personalization of query

  6. Spelling Correction for Search Engine Queries

    Microsoft Academic Search

    Bruno Martins; Mário J. Silva

    2004-01-01

    Search engines have become the primary means of accessing informa- tion on the Web. However, recent studies show misspelled words are very com- mon in queries to these systems. When users misspell query, the results are incor- rect or provide inconclusive information. In this work, we discuss the integration of a spelling correction component into tumba!, our community Web search

  7. Similarity Search in Biological and Engineering Databases

    Microsoft Academic Search

    Hans-peter Kriegel; Martin Pfeifle; Stefan Schönauer

    2004-01-01

    Similarity search is an important task in a wide range of scie ntific database applications. Besides being used directly, it is also used as a basic operation for many da ta mining algorithms. Example applications which are presented in this article are functional classific ation of proteins in biological databases and the similarity search of CAD parts in engineering environme

  8. Sexual Information Seeking on Web Search Engines

    Microsoft Academic Search

    Amanda Spink; Andrew Koricich; B. J. Jansen; Charles Cole

    2004-01-01

    Sexual information seeking is an important element within human information behavior. Seeking sexually related information on the Internet takes many forms and channels, includ- ing chat rooms discussions, accessing Websites or searching Web search engines for sexual materials. The study of sexual Web queries provides insight into sexually-related information- seeking behavior, of value to Web users and providers alike. We

  9. Search Engines for Tomorrow's Scholars

    ERIC Educational Resources Information Center

    Fagan, Jody Condit

    2011-01-01

    Today's scholars face an outstanding array of choices when choosing search tools: Google Scholar, discipline-specific abstracts and index databases, library discovery tools, and more recently, Microsoft's re-launch of their academic search tool, now dubbed Microsoft Academic Search. What are these tools' strengths for the emerging needs of…

  10. Clinician Search Behaviors May Be Influenced by Search Engine Design

    PubMed Central

    Coiera, Enrico; Zrimec, Tatjana; Compton, Paul

    2010-01-01

    Background Searching the Web for documents using information retrieval systems plays an important part in clinicians’ practice of evidence-based medicine. While much research focuses on the design of methods to retrieve documents, there has been little examination of the way different search engine capabilities influence clinician search behaviors. Objectives Previous studies have shown that use of task-based search engines allows for faster searches with no loss of decision accuracy compared with resource-based engines. We hypothesized that changes in search behaviors may explain these differences. Methods In all, 75 clinicians (44 doctors and 31 clinical nurse consultants) were randomized to use either a resource-based or a task-based version of a clinical information retrieval system to answer questions about 8 clinical scenarios in a controlled setting in a university computer laboratory. Clinicians using the resource-based system could select 1 of 6 resources, such as PubMed; clinicians using the task-based system could select 1 of 6 clinical tasks, such as diagnosis. Clinicians in both systems could reformulate search queries. System logs unobtrusively capturing clinicians’ interactions with the systems were coded and analyzed for clinicians’ search actions and query reformulation strategies. Results The most frequent search action of clinicians using the resource-based system was to explore a new resource with the same query, that is, these clinicians exhibited a “breadth-first” search behaviour. Of 1398 search actions, clinicians using the resource-based system conducted 401 (28.7%, 95% confidence interval [CI] 26.37-31.11) in this way. In contrast, the majority of clinicians using the task-based system exhibited a “depth-first” search behavior in which they reformulated query keywords while keeping to the same task profiles. Of 585 search actions conducted by clinicians using the task-based system, 379 (64.8%, 95% CI 60.83-68.55) were conducted in this way. Conclusions This study provides evidence that different search engine designs are associated with different user search behaviors. PMID:20601351

  11. MathWebSearch 0.5: Scaling an Open Formula Search Engine

    E-print Network

    Kohlhase, Michael

    of (mathematical) formulae. Standard search engines like Google cannot deal with formulae at all, severely limitingWebSearch is an open-source, open-format, content- oriented search engine for mathematical formulae. It is a completeMathWebSearch 0.5: Scaling an Open Formula Search Engine Michael Kohlhase, Bogdan A. Matican

  12. Web searching, search engines and Information Retrieval

    Microsoft Academic Search

    Dirk Lewandowski

    2005-01-01

    ThisarticlediscussesWebsearchengines;mainlythechallengesinindexingtheWorldWideWeb,theuserbehaviour, and the ranking factors used by these engines. Ranking factors are divided into query-dependent and query-independent factors, the latter of which have become more and more important within recent years. The possibilities of these factors are limited, mainly of those that are based on the widely used link popularity measures. The article concludes with an overview of factors that

  13. Spelling correction in the PubMed search engine

    Microsoft Academic Search

    W. John Wilbur; Won Kim; Natalie Xie

    2006-01-01

    It is known that users of internet search engines often enter queries with misspellings in one or more search terms. Several web search engines make suggestions for correcting misspelled words, but the methods used are proprietary and unpublished to our knowledge. Here we describe the methodology we have developed to perform spelling correction for the PubMed search engine. Our approach

  14. Keynote Talk Search Engine Support for Software Applications

    E-print Network

    Callan, Jamie

    engine architectures, federated search of groups of search engines, adaptive information filtering, textKeynote Talk Search Engine Support for Software Applications Jamie Callan Language Technologies-answering, computer-assisted language learning, text mining, and other software applications that use a full-search

  15. Image searching on the Excite Web search engine

    Microsoft Academic Search

    Abby Goodrum; Amanda Spink

    2001-01-01

    A growing body of research is beginning to explore the information-seeking behavior of Web users. The vast majority of these studies have concentrated on the area of textual information retrieval (IR). Little research has examined how people search for non-textual information on the Internet, and few large-scale studies has investigated visual information-seeking behavior with general-purpose Web search engines. This study

  16. Mining User preference using Spy voting for search engine personalization

    Microsoft Academic Search

    Ng Wilfred; Lin Deng; Dik Lun Lee

    2007-01-01

    This article addresses search engine personalization. We present a new approach to mining a user's preferences on the search results from clickthrough data and using the discovered preferences to adapt the search engine's ranking function for improving search quality. We develop a new preference mining technique called SpyNB, which is based on the practical assumption that the search results clicked

  17. Automatic performance evaluation of web search engines using judgments of metasearch engines

    Microsoft Academic Search

    Hamid Sadeghi

    2011-01-01

    Purpose – The purpose of this paper is to introduce two new automatic methods for evaluating the performance of search engines. The reported study uses the methods to experimentally investigate which search engine among three popular search engines (Ask.com, Bing and Google) gives the best performance. Design\\/methodology\\/approach – The study assesses the performance of three search engines. For each one

  18. SAVVYSEARCH: A Metasearch Engine That Learns Which Search Engines to Query

    Microsoft Academic Search

    Adele E. Howe; Daniel Dreilinger

    1997-01-01

    Search engines are among the most successful applications on the Web today. Somany search engines have been created that it is difficult for users to know wherethey are, how to use them and what topics they best address. Meta-search enginesreduce the user burden by dispatching queries to multiple search engines in parallel.The SavvySearch meta-search engine is designed to efficiently query

  19. Bruce Clay, LLC: Search Engine Optimization

    NSDL National Science Digital Library

    Anyone who has ever wondered how online search engines determine the order of appearance of Web sites can learn about the complex process here. Web site ranking is more than a curiosity, however, as it can be very important to companies that depend on online recognition. Therefore, this site is also useful because it contains detailed instructions about how to achieve and maintain a high rank. A series of eleven steps are outlined, which must be endlessly repeated to make sure that a Web site's rank does not slip. Even for people who do not have a Web site, this material provides an interesting glimpse into the dynamics of search engines.

  20. Amnesi: The Internet Name Search Engine

    NSDL National Science Digital Library

    This site, provided by Synchrony Systems, Inc., lets you search for a domain name when you don't remember the exact name (or if the name is misspelled or is only a partial name). The user enters a guess and the engine searches an extensive database of domain names for names that are similar to the guess. Search results return similar names; in addition, results offer options for obtaining more information about a given domain (retrieved using the whois protocol) or subdomains of a given domain name.

  1. The EBI Search engine: providing search and retrieval functionality for biological data from EMBL-EBI

    PubMed Central

    Squizzato, Silvano; Park, Young Mi; Buso, Nicola; Gur, Tamer; Cowley, Andrew; Li, Weizhong; Uludag, Mahmut; Pundir, Sangya; Cham, Jennifer A.; McWilliam, Hamish; Lopez, Rodrigo

    2015-01-01

    The European Bioinformatics Institute (EMBL-EBI—https://www.ebi.ac.uk) provides free and unrestricted access to data across all major areas of biology and biomedicine. Searching and extracting knowledge across these domains requires a fast and scalable solution that addresses the requirements of domain experts as well as casual users. We present the EBI Search engine, referred to here as ‘EBI Search’, an easy-to-use fast text search and indexing system with powerful data navigation and retrieval capabilities. API integration provides access to analytical tools, allowing users to further investigate the results of their search. The interconnectivity that exists between data resources at EMBL-EBI provides easy, quick and precise navigation and a better understanding of the relationship between different data types including sequences, genes, gene products, proteins, protein domains, protein families, enzymes and macromolecular structures, together with relevant life science literature. PMID:25855807

  2. Competing Search Engines With Utility Maximising Consumers And Ordinary Search Results

    Microsoft Academic Search

    Greg TAYLOR

    2008-01-01

    Summary: I model strategic interaction amongst search engines that compete to serve consumer needs. Search engines generate revenue from advertisers, but also provide free organic search results. I demonstrate that, in an attempt to win market share, the search engines compete not only against each other, but also against themselves: pro- viding high-quality free links that compete for clicks with

  3. Chemical-text hybrid search engines.

    PubMed

    Zhou, Yingyao; Zhou, Bin; Jiang, Shumei; King, Frederick J

    2010-01-01

    As the amount of chemical literature increases, it is critical that researchers be enabled to accurately locate documents related to a particular aspect of a given compound. Existing solutions, based on text and chemical search engines alone, suffer from the inclusion of "false negative" and "false positive" results, and cannot accommodate diverse repertoire of formats currently available for chemical documents. To address these concerns, we developed an approach called Entity-Canonical Keyword Indexing (ECKI), which converts a chemical entity embedded in a data source into its canonical keyword representation prior to being indexed by text search engines. We implemented ECKI using Microsoft Office SharePoint Server Search, and the resultant hybrid search engine not only supported complex mixed chemical and keyword queries but also was applied to both intranet and Internet environments. We envision that the adoption of ECKI will empower researchers to pose more complex search questions that were not readily attainable previously and to obtain answers at much improved speed and accuracy. PMID:20047295

  4. Quality Dimensions of Internet Search Engines.

    ERIC Educational Resources Information Center

    Xie, M.; Wang, H.; Goh, T. N.

    1998-01-01

    Reviews commonly used search engines (AltaVista, Excite, infoseek, Lycos, HotBot, WebCrawler), focusing on existing comparative studies; considers quality dimensions from the customer's point of view based on a SERVQUAL framework; and groups these quality expectations in five dimensions: tangibles, reliability, responsiveness, assurance, and…

  5. Human Search Engines: The Next Killer App?

    ERIC Educational Resources Information Center

    Pack, Thomas

    2000-01-01

    Explains human search engines, also known as online advisors, knowledge networks, interactive Q&A (question & answer), or people portals, which are all Web sites where you can ask questions and receive personal responses. Provides examples of different types, some of which are free, including the Internet Public Library, and some which charge…

  6. Search engine for Amharic Web content

    Microsoft Academic Search

    Hassen Redwan; Tessema Mindaye; Solomon Atnafu

    2009-01-01

    Nowadays search engines provide the easiest way to reach information resources that are available on the Web. The use of languages other than English has been growing exponentially on the Web. Amharic language belongs to one of these languages. Web documents in Amharic language are increasing very fast. The number of Internet users in Ethiopia is growing dramatically. Nevertheless, the

  7. Optimizing search engines using clickthrough data

    Microsoft Academic Search

    Thorsten Joachims

    2002-01-01

    This paper presents an approach to automatically optimizing the retrieval quality of search engines using clickthrough data. Intuitively, a good information retrieval system should present relevant documents high in the ranking, with less relevant documents following below. While previous approaches to learning retrieval functions from examples exist, they typically require training data generated from relevance judgments by experts. This makes

  8. Exploring Independent Trends in a Topic-Based Search Engine

    Microsoft Academic Search

    Jukka Perkio; Wray Buntine; Sami Perttu

    2004-01-01

    Topic-based search engines are an alternative to simple keyword search engines that are common in today's intranets. The temporal behaviour of the topics in a topic model based search engine can be used for trend analysis, which is an important research goal on its own. We apply topic modelling to an online financial newspaper data and show that some of

  9. Exploring Independent Trends in a Topic-Based Search Engine

    Microsoft Academic Search

    Jukka Perkiö; Wray L. Buntine; Sami Perttu

    2004-01-01

    Topic-based search engines are an alternative to sim- ple keyword search engines that are common in today's in- tranets. The temporal behaviour of the topics in a topic model based search engine can be used for trend analysis, which is an important research goal on its own. We apply topic modelling to an online financial newspaper data and show that

  10. New Media? The Political Economy of Internet Search Engines

    Microsoft Academic Search

    Elizabeth Van Couvering; E. j. Van Couvering

    Abstract This paper presents a structural analysis of the Internet search engine market. Search engines are a core element of the Internet media system, topping the Nielsen NetRatings Top 10 list of online properties in every market measured,and generating advertising revenues of billions of dollars each year. Using a search engine is the most popular online activity after reading email.

  11. Google's PageRank: The Math Behind the Search Engine

    E-print Network

    Lakoba, Taras I.

    Google's PageRank: The Math Behind the Search Engine Rebecca S. Wills Department of Mathematics on a given day. Even though there are many internet search engines, Google, Yahoo!, and MSN receive over 81 equals that of Google [11], Google continues to thrive as the search engine of choice receiving over 46

  12. Evidence-based Medicine Search: a customizable federated search engine

    PubMed Central

    Bracke, Paul J.; Howse, David K.; Keim, Samuel M.

    2008-01-01

    Purpose: This paper reports on the development of a tool by the Arizona Health Sciences Library (AHSL) for searching clinical evidence that can be customized for different user groups. Brief Description: The AHSL provides services to the University of Arizona's (UA's) health sciences programs and to the University Medical Center. Librarians at AHSL collaborated with UA College of Medicine faculty to create an innovative search engine, Evidence-based Medicine (EBM) Search, that provides users with a simple search interface to EBM resources and presents results organized according to an evidence pyramid. EBM Search was developed with a web-based configuration component that allows the tool to be customized for different specialties. Outcomes/Conclusion: Informal and anecdotal feedback from physicians indicates that EBM Search is a useful tool with potential in teaching evidence-based decision making. While formal evaluation is still being planned, a tool such as EBM Search, which can be configured for specific user populations, may help lower barriers to information resources in an academic health sciences center. PMID:18379665

  13. iMed: An Intelligent Medical Web Search Engine

    Microsoft Academic Search

    Gang Luo

    Searching for medical information on the Web is becoming popular and important these days. However, medical search has its own unique requirements that are not well handled by existing medical Web search engines. In this paper, we present iMed, the first intelligent medical Web search engine that extensively uses domain-specific medical knowledge and questionnaire to facilitate ordinary Internet users to

  14. Integrated engine generator for aircraft secondary power

    NASA Technical Reports Server (NTRS)

    Secunde, R. R.

    1972-01-01

    An integrated engine-generator for aircraft secondary power generation is described. The concept consists of an electric generator located inside a turbojet or turbofan engine and both concentric with and driven by one of the main engine shafts. The electric power conversion equipment and generator controls are located in the aircraft. When properly rated, the generator serves as an engine starter as well as a source of electric power. This configuration reduces or eliminates the need for an external gear box on the engine and permits reduction in the nacelle diameter.

  15. Engine powered auxiliary air supply system

    SciTech Connect

    Mc Lean, J.R.

    1987-01-27

    This patent describes an auxiliary air supply system comprising: an engine; at least one exhaust driven turbocharger including a turbine and a compressor associated therewith for supply of compressed air to the engine; a low pressure compressor including means for powering the low pressure compressor utilizing the engine exhaust gas and flow connected to receive a portion of the compressed air exiting the engine turbocharger compressor; a high pressure compressor including means for powering the high pressure compressor utilizing the engine exhaust gas and flow connected to receive the compressed air exiting the low pressure compressor; and means for directing engine exhaust gases between at least one engine turbocharger and the means for powering the low and high pressure compressors.

  16. Competitive caching of query results in search engines

    Microsoft Academic Search

    Ronny Lempel; Shlomo Moran

    2004-01-01

    We study the problem of caching query result pages in Web search engines. Popular search engines receive millions of queries per day, and for each query, return a result page to the user who submitted the query. The user may request additional result pages for the same query, submit a new query, or quit searching altogether. An ecient scheme for

  17. SASE: Implementation of a Compressed Text Search Engine

    Microsoft Academic Search

    Srinidhi Varadarajan; Tzi-cker Chiueh

    1997-01-01

    Keyword based search engines are the basic building block of text retrieval systems. Higher level systems like content sensitive search engines and knowledge- based systems still rely on keyword search as the underlying text retrieval mechanism. With the explosive growth in content, Internet and Intranet information repositories require efficient mechanisms to store as well as index data. In this paper

  18. X-Site: a workplace search tool for software engineers

    Microsoft Academic Search

    Peter C. K. Yeung; Luanne Freund; Charles L. A. Clarke

    2007-01-01

    Professionals in the workplace need high-precision search tools capable of retrieving information that is useful and appropriate to the task at hand. One approach to identifying content, which is not only relevant but also useful, is to make use of the task context of the search. We present X-Site, an enterprise search engine for the software engineering domain that exploits

  19. Building a search engine model with morphological normalization support

    Microsoft Academic Search

    Jure Mijic; J. Snajder

    2008-01-01

    Searching a collection of documents can seem like an easy task, but manipulating textual data can be difficult because the data are mostly unstructured. We undertook the task of building an effective search engine for a collection of Croatian legislative documents. The developed search engine model supports multiple modules for information retrieval. To improve the effectiveness of the retrieval, we

  20. Initial tests of thermoacoustic space power engine

    Microsoft Academic Search

    Backhaus

    2002-01-01

    Future NASA deep-space missions will require radioisotope-powered electric generators that are just as reliable as current RTGs, but more efficient and of higher specific power (Wikg). Thennoacoustic engines at the -1-kW scale have converted high-temperature heat into acoustic, or PV, power without moving parts at 30% efficiency. Consisting of only tubes and a few heat exchangers, thennoacoustic engines are low

  1. Entity Resolution using Search Engine Results Madian Khabsa

    E-print Network

    Giles, C. Lee

    Terms Algorithms Keywords Entity Resolution, Disambiguation, Search Engines 1. INTRODUCTIONEntity Resolution using Search Engine Results Madian Khabsa Computer Science and Engineering, PA giles@ist.psu.edu ABSTRACT Given a set of automatically extracted entities E of size n, we would

  2. Building Domain-Specific Search Engines with Machine Learning Techniques

    Microsoft Academic Search

    Andrew McCallum; Kamal Nigam; Jason Rennie; Kristie Seymore

    1999-01-01

    Domain-specific search engines are growing in popu- larity because they offer increased accuracy and extra functionality not possible with the general, Web-wide search engines. For example, www.campsearch.com allows complex queries by age-group, size, location and cost over .summer camps. Unfortunately these domain-specific search engines are difficult and time- consuming to maintain. This paper proposes the use of machine learning techniques

  3. Matroid Matching: The Power of Local Search

    E-print Network

    Rapaport, Iván

    Matroid Matching: The Power of Local Search Jon Lee, Maxim Sviridenko, Jan Vondrák. Presented by José Soto. #12;Outline Problem Definition. Matroid review. Matroid Matching / Matchoid / Matroid doesn't work. Generalizations and Conclusions: Matroid k-Parity. Open Problems. #12;Matroids review

  4. Initial tests of thermoacoustic space power engine.

    SciTech Connect

    Backhaus, S. N. (Scott N.)

    2002-01-01

    Future NASA deep-space missions will require radioisotope-powered electric generators that are just as reliable as current RTGs, but more efficient and of higher specific power (Wikg). Thennoacoustic engines at the -1-kW scale have converted high-temperature heat into acoustic, or PV, power without moving parts at 30% efficiency. Consisting of only tubes and a few heat exchangers, thennoacoustic engines are low mass and promise to be highly reliable. Coupling a thennoacoustic engine to a low mass, highly reliable and efficient linear alternator will create a heat-driven electric generator suitable for deep-space applications. Conversion efficiency data will be presented on a demonstration thennoacoustic engine designed for the 1 00-Watt power range.

  5. Using MATHCAD in teaching power engineering

    Microsoft Academic Search

    Cristian Domnisoru

    2005-01-01

    Students typically use small calculators or personal computer applications such as MATLAB or MATHCAD to perform basic electrical engineering calculations. From the experience of teaching several power engineering courses, the author noted that when using computer software to solve problems, students tend to lose the meaning of the equations, concentrating solely on typing variables and numbers. Some programs are especially

  6. LITERATURE SEARCHES A design, development, or research engineer often must search for information on

    E-print Network

    Chapter 43 LITERATURE SEARCHES A design, development, or research engineer often must search://www.library.okstate.edu/liblink.htm 2 e.g., http://www.crcpress.com/ 1 #12;2 CHAPTER 43. LITERATURE SEARCHES · Look for bibliographies/or journals. Since the early 1970s it has been possible to carry out computer searches of literature databases

  7. Power lever apparatus for a turbine engine

    SciTech Connect

    McCombs Jr., H. L.

    1985-05-21

    In a turbine engine having a compressor with a bleed valve and a variable geometry apparatus is responsive to an operational control member for regulating the flow rate of fuel supplied the turbine engine as a function of atmospheric pressure and the temperature of air supplied to the compressor corresponding to movement of a power lever by an operator to a desired operation of the turbine engine. The power lever has an indicator member fluidically connected to a follower member linked to the operational control member. The fluidic connection is responsive to operational parameters of the turbine engine and limits the rotational input to the follower member when the rate of fuel flow could cause stalling and the development of an unacceptable operating temperature or overspeed condition in the turbine engine.

  8. Brief Report: Consistency of Search Engine Rankings for Autism Websites

    ERIC Educational Resources Information Center

    Reichow, Brian; Naples, Adam; Steinhoff, Timothy; Halpern, Jason; Volkmar, Fred R.

    2012-01-01

    The World Wide Web is one of the most common methods used by parents to find information on autism spectrum disorders and most consumers find information through search engines such as Google or Bing. However, little is known about how the search engines operate or the consistency of the results that are returned over time. This study presents the…

  9. Combining Website Search Engine Optimization with Advanced Web Log Analysis

    Microsoft Academic Search

    Seamus Dromey; Ciara Heavin; Karen Neville

    2005-01-01

    This paper provides a clear guideline to the development of an online decision-making tool. The importance of ranking for an organizations virtual presence through search engines is also discussed. The system described illustrates the complexity of the competition between organizations to be highly ranked by leading search engines. The system not only reports the rankings of the owners but compares

  10. Automated Evaluation of Search Engine Performance via Implicit User Feedback

    E-print Network

    Jansen, James

    for the real-time evaluation of a search engine's performance. Previous research has focused on the scope a cost and time effective manner of addressing this problem. Web search engines can use human evaluation is the availability of real time data regarding system performance. We capture user relevance judgments actions

  11. The Gander Search Engine for Personalized Networked Spaces

    E-print Network

    Julien, Christine

    simulation. I. INTRODUCTION In Personalized Network Spaces (PNetS), people carry or wear mobile devicesThe Gander Search Engine for Personalized Networked Spaces TR-ARiSE-2011-008 Jonas Michel1 The University of Texas at Austin #12;The Gander Search Engine for Personalized Networked Spaces 1Jonas Michel, 1

  12. Unsupervised Semantic Similarity Computation using Web Search Engines

    Microsoft Academic Search

    Elias Iosif; Alexandros Potamianos

    2007-01-01

    In this paper, we propose two novel web-based metrics for semantic similarity computation between words. Both metrics use a web search engine in order to exploit the retrieved information for the words of interest. The first metric considers only the page counts returned by a search engine, based on the work of [1]. The second downloads a number of the

  13. An FPGA-based Search Engine for Unstructured

    E-print Network

    Chamberlain, Roger

    An FPGA-based Search Engine for Unstructured Database Benjamin West, Roger D. Chamberlain, Ronald S. Indeck, and Qiong Zhang Benjamin West, Roger D. Chamberlain, Ronald S. Indeck, and Qiong Zhang, "An FPGA Brookings Dr. St. Louis, MO 63130-4899 #12;An FPGA-based Search Engine for Unstructured Database Benjamin

  14. Using Association Rules to Discover Search Engines Related Queries

    Microsoft Academic Search

    Bruno M. Fonseca; Paulo Braz Golgher; Edleno Silva De Moura; Nivio Ziviani

    2003-01-01

    This work presents a method for automaticgenerate sug- gestions of related queries submitted to Web search engines. The method extracts information from the log of past sub- mitted queries to search engines using algorithms for min- ing association rules. Experimental results were performed on a log containing more than 2.3 million queries submit- tedto a commercial searchingenginegivingcorrect sugges- tions in

  15. Evaluation and comparison of search engines using the LSP method

    Microsoft Academic Search

    Jozo J. Dujmovic; Haishi Bai

    2006-01-01

    We present a comprehensive model for quantitative evaluation and comparison of search engines. The model is based on the LSP method for system evaluation. The basic contribution of our approach is the aggregation of all relevant attributes that reflect functionality, usability, and performance of search engines. In this respect our model is fully consistent with the ISO 9126 standard for

  16. Scalable federated search engine using Z39.50 protocol

    Microsoft Academic Search

    Alexandre Khokhlov

    The article discusses federated search engines used in library community to build virtual union catalogues based on Z39.50 protocol. It summarizes the two main problems of current implementations and suggests the ways to overcome them in the future implementations. Author proposes an approach to build a federated search engine that can be used in an environment with many sources and

  17. Meta-search: aggregating search engine results using rank-distance

    Microsoft Academic Search

    Tiberiu D?net; Liviu P. Dinu

    2011-01-01

    In this demonstration, we present a meta-search engine based on rank-distance, which is a similarity measure between partial rankings. Our meta-search engine fetches results from four main search engines: Google, Yahoo, Bing and Ask.com and combines them into one aggregated ranking, indicating for each result the position that it had in the original rankings. This combination of multiple rankings into

  18. Research on Personalized Information Filtering of Search Engine

    NASA Astrophysics Data System (ADS)

    Zhang, Shu; Chen, Xinrong; Luo, Changshou

    Since network has been created and developing rapidly in recent years, the age of information exploding is coming. The Search Engine becomes more and more important for people, but the traditional search engine retrieves and provides information just according to the keywords that users input. How to recommend the right information to users has become the hot point. The technology of personalized information filtering brings people hope .The paper I present analyzed the achievements of those filtering technologies ,and adopted user-system complex-operating modeling to build User-activitycollecting module, User-interest-updating module and User-searching module, in order to meet theme-oriented searching’s needs. Experiments showed that the user-interest model can provide personalized service and enhance search engine’s precision.

  19. IntegromeDB: an integrated system and biological search engine

    PubMed Central

    2012-01-01

    Background With the growth of biological data in volume and heterogeneity, web search engines become key tools for researchers. However, general-purpose search engines are not specialized for the search of biological data. Description Here, we present an approach at developing a biological web search engine based on the Semantic Web technologies and demonstrate its implementation for retrieving gene- and protein-centered knowledge. The engine is available at http://www.integromedb.org. Conclusions The IntegromeDB search engine allows scanning data on gene regulation, gene expression, protein-protein interactions, pathways, metagenomics, mutations, diseases, and other gene- and protein-related data that are automatically retrieved from publicly available databases and web pages using biological ontologies. To perfect the resource design and usability, we welcome and encourage community feedback. PMID:22260095

  20. E-Referencer: Transforming Boolean OPACs to Web Search Engines.

    ERIC Educational Resources Information Center

    Khoo, Christopher S. G.; Poo, Danny C. C.; Toh, Teck-Kang; Hong, Glenn

    E-Referencer is an expert intermediary system for searching library online public access catalogs (OPACs) on the World Wide Web. It is implemented as a proxy server that mediates the interaction between the user and Boolean OPACs. It transforms a Boolean OPAC into a retrieval system with many of the search capabilities of Web search engines.…

  1. A Fuzzy-Match Search Engine for Physician Directories

    PubMed Central

    Ye, Zhan; Murali, Narayana

    2014-01-01

    Background A search engine to find physicians’ information is a basic but crucial function of a health care provider’s website. Inefficient search engines, which return no results or incorrect results, can lead to patient frustration and potential customer loss. A search engine that can handle misspellings and spelling variations of names is needed, as the United States (US) has culturally, racially, and ethnically diverse names. Objective The Marshfield Clinic website provides a search engine for users to search for physicians’ names. The current search engine provides an auto-completion function, but it requires an exact match. We observed that 26% of all searches yielded no results. The goal was to design a fuzzy-match algorithm to aid users in finding physicians easier and faster. Methods Instead of an exact match search, we used a fuzzy algorithm to find similar matches for searched terms. In the algorithm, we solved three types of search engine failures: “Typographic”, “Phonetic spelling variation”, and “Nickname”. To solve these mismatches, we used a customized Levenshtein distance calculation that incorporated Soundex coding and a lookup table of nicknames derived from US census data. Results Using the “Challenge Data Set of Marshfield Physician Names,” we evaluated the accuracy of fuzzy-match engine–top ten (90%) and compared it with exact match (0%), Soundex (24%), Levenshtein distance (59%), and fuzzy-match engine–top one (71%). Conclusions We designed, created a reference implementation, and evaluated a fuzzy-match search engine for physician directories. The open-source code is available at the codeplex website and a reference implementation is available for demonstration at the datamarsh website. PMID:25601050

  2. Bibliographical Meta Search Engine for the Retrieval of Scientific Articles

    Microsoft Academic Search

    Artur Gajek; Stefan Klink; Patrick Reuther; Bernd Walter; Alexander Weber

    2007-01-01

    The University of Trier maintains the DBLP (Digital Bibliography & Library Project) Computer Science Bibliography which offers bibliographic information about more than 870.000 scientific publications.\\u000a This paper describes the DBLP WebCrawler, a meta search engine that is able to search for full text publications in PDF format for each DBLP entry on the web. Various\\u000a search engines such as Google

  3. Automated Test Data Generation using Search Based Software Engineering Mark Harman

    E-print Network

    Singer, Jeremy

    Automated Test Data Generation using Search Based Software Engineering Mark Harman CREST, King. 1. Introduction Search based optimization has been applied to a wide variety of Software Engineering, reverse engineering, refactoring, pro­ gram comprehension, service­oriented software engineer­ ing

  4. A Search Engine Log Analysis of Music-Related Web Searching

    Microsoft Academic Search

    Sally Jo Cunningham; David Bainbridge

    2010-01-01

    \\u000a We explore music search behavior by identifying music-related queries in a large (over 20 million queries) search engine log,\\u000a gathered over three months in 2006. Music searching is a significant information behavior: approximately 15% of users conduct\\u000a at least one music search in the time period studied, and approximately 1.35% of search activities are connected to music.\\u000a We describe the

  5. Sourcerer: A Search Engine for Open Source Code

    Microsoft Academic Search

    Sushil Bajracharya; Trung Ngo; Erik Linsteady; Paul Rigory; Yimeng Douy; Cristina Lopes

    sourcerer is a search engine for open source code that extracts fine-grained structural information from the code. This information is used both to implement a basic notion of code rank and to enable search forms that go be- yond conventional keyword-based searches.sourcerer supports two types of searches: (1) implementations, and their use; and (2) program structures. Several schemes were compared

  6. Search Engine Watch: Google's New Look & New File Types

    NSDL National Science Digital Library

    Sullivan, Danny.

    2001-01-01

    Some of our readers may already have noticed that Google (last mentioned in the July 20, 2001 Scout Report) is sporting a new look these days. Running along the top of the search page are now four tabs: Web, Images, Groups (newsgroups), and Directory (Open Directory's human-selected listings) that enable users to see different sets of search results. We reported on the Beta version of Google's image search engine in the June 29, 2001 Scout Report and find its results quite good. The Search Engine Report covers these latest improvements to Google.

  7. Sourcerer: a search engine for open source code supporting structure-based search

    Microsoft Academic Search

    Sushil Krishna Bajracharya; Trung Chi Ngo; Erik Linstead; Yimeng Dou; Paul Rigor; Pierre Baldi; Cristina Videira Lopes

    2006-01-01

    We present Sourcerer, a search engine for open-source code. Sourcerer extracts fine-grained structural information from the code and stores it in a relational model. This information is used to implement a basic notion of CodeRank and to enable search forms that go beyond conventional keyword-based searches.

  8. Maximum power configuration for multireservoir chemical engines

    NASA Astrophysics Data System (ADS)

    Xia, Shaojun; Chen, Lingen; Sun, Fengrui

    2009-06-01

    A model of a multireservoir isothermal endoreversible chemical engine is put forward in this paper. Optimal control theory is used to determine the optimal configuration of the multireservoir isothermal endoreversible chemical engine for maximum power output. The optimal cycle consists of two constant chemical potential branches and two instantaneous constant mass-flux branches, which is independent of the number of mass reservoirs and the mass transfer law. The results show that, in order to obtain the maximum power output, some mass reservoirs should never connect to the working fluid in the mass transfer processes. A numerical example is provided for a linear mass transfer law three-mass-reservoir chemical engine. The effects of the potential changes of the intermediate mass reservoir on the optimal configuration of the chemical engine and the performance corresponding to the optimal configuration are analyzed. The obtained results are compared with those obtained for a multireservoir endoreversible heat engine. The object studied in this paper is general, and the results could provide some guidelines for optimal design and operation of real chemical engines.

  9. Solar powered engine and tracking system

    Microsoft Academic Search

    Chromie

    1980-01-01

    A solar powered engine and tracking system comprises a piston working within a cylinder for turning a drive shaft for driving an electrical generator or performing other useful work, a solar concentrator comprising a plurality of mirrors, each reflecting sun light on a common focal point on the end of the cylinder for heating a flash boiler located thereon, preheated

  10. Solar powered engine and tracking system

    Microsoft Academic Search

    Chromie

    1979-01-01

    A solar powered engine and tracking system comprises a piston working within a cylinder for turning a drive shaft for driving an electrical generator or performing other useful work, a solar concentrator comprising a plurality of mirrors, each reflecting sunlight on a common focal point on the end of the cylinder for heating a flash boiler located thereon, preheated water

  11. Adaptation of Uniqueness Metric (SeRUM) to enhance analogous patents search engine and innovation acceleration

    E-print Network

    Mountziaris, T. J.

    Adaptation of Uniqueness Metric (SeRUM) to enhance analogous patents search engine and innovation of innovation. The analogous patent search engine "Analogy Finder", created by Dr. Anthony McCaffrey, enables engineers to search the patent database more accurately. The search engine uses a standardized syntax

  12. Fully Automatic Wrapper Generation For Search Engines Hongkun Zhao, Weiyi Meng

    E-print Network

    Meng, Weiyi

    with search engines such as automatic construction and maintenance of metasearch engines and deep Web crawling the result pages returned by the search engines used. As another example, deep web crawling is to crawl documents or data records from (deep web) search engines [24] and it too needs to extract the search results

  13. Engineering manual and electric powered wheelchairs.

    PubMed

    Cooper, R A

    1999-01-01

    The sophistication required to develop and properly configure a wheelchair is illustrated by the amount and complexity of the research being conducted. At this time there appears to be between 1.5 and 2.0 million full-time wheelchair users within the United States. The reliance of the user on the wheelchair and the amount of time in the wheelchair provide significant challenges for the wheelchair design engineer. Currently there are a wide variety of wheelchair designs that are commercially available. These wheelchairs accommodate a variety of people's needs, and represent significant progress. The current trend among manufacturers of manual wheelchairs seems to be cost-reduction engineering. The ergonomics of long-term wheelchair use are critical to the advancement of wheelchair design and to the clinical selection of wheelchairs. Electric powered wheelchairs appear to be progressing faster than nearly all other types of wheelchairs. This is due to the availability of computing power with low cost microcontrollers and associated peripherals. The greater range and availability of sensors are also making changes into the design of electric powered wheelchairs. The interaction between an electric powered wheelchair and the user can be extremely complex. In many cases, individual solutions are necessary. One of the more challenging questions is determining the abilities of the user required to drive an electric powered wheelchair effectively. There have been substantial improvements in the engineering of all wheelchairs. However, there remain significant issues to be addressed. PMID:10638849

  14. Real-time earthquake monitoring using a search engine method

    NASA Astrophysics Data System (ADS)

    Zhang, Jie; Zhang, Haijiang; Chen, Enhong; Zheng, Yi; Kuang, Wenhuan; Zhang, Xiong

    2014-12-01

    When an earthquake occurs, seismologists want to use recorded seismograms to infer its location, magnitude and source-focal mechanism as quickly as possible. If such information could be determined immediately, timely evacuations and emergency actions could be undertaken to mitigate earthquake damage. Current advanced methods can report the initial location and magnitude of an earthquake within a few seconds, but estimating the source-focal mechanism may require minutes to hours. Here we present an earthquake search engine, similar to a web search engine, that we developed by applying a computer fast search method to a large seismogram database to find waveforms that best fit the input data. Our method is several thousand times faster than an exact search. For an Mw 5.9 earthquake on 8 March 2012 in Xinjiang, China, the search engine can infer the earthquake’s parameters in <1?s after receiving the long-period surface wave data.

  15. Research on Personalized Information Filtering of Search Engine

    NASA Astrophysics Data System (ADS)

    Zhang, Shu; Chen, Xinrong; Luo, Changshou

    Since network has been created and developing rapidly in recent years, the age of information exploding is coming. The Search Engine becomes more and more important for people, but the traditional search engine retrieves and provides information just according to the keywords that users input. How to recommend the right information to users has become the hot point. The technology of personalized information filtering brings people hope .The paper I present analyzed the achievements of those filtering technologies ,and adopted user-system complex-operating modeling to build User-activitycollecting module, User-interest-updating module and User-searching module, in order to meet theme-oriented searching's needs. Experiments showed that the user-interest model can provide personalized service and enhance search engine's precision.

  16. Search Engine-Crawler Symbiosis: Adapting to Community Interests

    E-print Network

    Bradshaw, Shannon

    Search Engine-Crawler Symbiosis: Adapting to Community Interests Gautam Pant, Shannon Bradshaw the crawler to better its performance. We show that the symbiosis can help the system learn about a community

  17. Engineering Your Job Search: A Job-Finding Resource for Engineering Professionals.

    ERIC Educational Resources Information Center

    1995

    This guide, which is intended for engineering professionals, explains how to use up-to-date job search techniques to design and conduct an effective job hunt. The first 11 chapters discuss the following steps in searching for a job: handling a job loss; managing time and financial resources while conducting a full-time job search; using objective…

  18. LAILAPS: the plant science search engine.

    PubMed

    Esch, Maria; Chen, Jinbo; Colmsee, Christian; Klapperstück, Matthias; Grafahrend-Belau, Eva; Scholz, Uwe; Lange, Matthias

    2015-01-01

    With the number of sequenced plant genomes growing, the number of predicted genes and functional annotations is also increasing. The association between genes and phenotypic traits is currently of great interest. Unfortunately, the information available today is widely scattered over a number of different databases. Information retrieval (IR) has become an all-encompassing bioinformatics methodology for extracting knowledge from complex, heterogeneous and distributed databases, and therefore can be a useful tool for obtaining a comprehensive view of plant genomics, from genes to traits. Here we describe LAILAPS (http://lailaps.ipk-gatersleben.de), an IR system designed to link plant genomic data in the context of phenotypic attributes for a detailed forward genetic research. LAILAPS comprises around 65 million indexed documents, encompassing >13 major life science databases with around 80 million links to plant genomic resources. The LAILAPS search engine allows fuzzy querying for candidate genes linked to specific traits over a loosely integrated system of indexed and interlinked genome databases. Query assistance and an evidence-based annotation system enable time-efficient and comprehensive information retrieval. An artificial neural network incorporating user feedback and behavior tracking allows relevance sorting of results. We fully describe LAILAPS's functionality and capabilities by comparing this system's performance with other widely used systems and by reporting both a validation in maize and a knowledge discovery use-case focusing on candidate genes in barley. PMID:25480116

  19. The Role of Exploratory Talk in Classroom Search Engine Tasks

    ERIC Educational Resources Information Center

    Knight, Simon; Mercer, Neil

    2015-01-01

    While search engines are commonly used by children to find information, and in classroom-based activities, children are not adept in their information seeking or evaluation of information sources. Prior work has explored such activities in isolated, individual contexts, failing to account for the collaborative, discourse-mediated nature of search

  20. Ambiguity Resolution in Search Engine Using Natural Language Web Application

    Microsoft Academic Search

    Azeez Nureni Ayofe; Azeez Raheem Ajetola; Ade Stanley Oyewole

    2009-01-01

    Our aim is to create NLWA technique which will be able to retrieve resources from a knowledge base in a more efficient way to respond to the ambiguity problem that occurs when performing the search using the search engine. This system was implemented with the fundamental concept of Natural Language Processing (NLP) whereby it differentiates the similar meaning (synonyms) or

  1. Mining User Preference Using Spy Voting for Search Engine Personalization

    E-print Network

    Wu, Dekai

    19 Mining User Preference Using Spy Voting for Search Engine Personalization WILFRED NG, LIN DENG search quality. We develop a new preference mining technique called SpyNB, which is based not draw any conclusions about the results that the user did not click on. As such, SpyNB is still valid

  2. Mining User Preference Using Spy Voting for Search Engine Personalization

    E-print Network

    Ng, Wilfred Siu Hung

    Mining User Preference Using Spy Voting for Search Engine Personalization Wilfred Ng, Lin Deng technique called SpyNB, which is based on the practical assumption that the search results clicked that the user did not click on. As such, SpyNB is still valid even if the user does not follow any order

  3. SPIDERING AND FILTERING WEB PAGES FOR VERTICAL SEARCH ENGINES

    Microsoft Academic Search

    Michael Chau

    2002-01-01

    IntroductionThe size of the Web is growing exponentially. The number of indexable pages on the web has exceeded 2 billion (Lyman &Varian, 2000). It is more difficult for search engines to keep an up-to-date and comprehensive search index, resulting in lowprecision and low recall rates. Users often md it difficult to search for useful and high-quality information on the Web.Domain-specific

  4. "openness of search engine": A critical flaw in search systems; a case study on google, yahoo and bing

    E-print Network

    Chakravarthy, Katuru SM Kalyana

    2012-01-01

    There is no doubt that Search Engines are playing a great role in Internet usage. But all the top search engines Google, Yahoo and Bing are having a critical flaw called "Openness of a Search Engine". An Internet user should be allowed to get the search results only when requested through Search engine's web page but the user must not be allowed to get the search results when requested through any web page that does not belong to the Search Engine. Only results of a search engine should be available to the Internet user but not the Search Engine. This paper explains the critical flaw called "Openness of Search Engine" with a case study on top 3 search engines 'Google', 'Yahoo' and 'Bing'. This paper conducts an attack based test using J2EE framework and proves that 'Google' passed the test and it strongly protects its Critical Search System, where 'Yahoo' and 'Bing' are failed to protect their Search Engines. But previously 'Google' also had other high severity issues with the Openness of search engine; this ...

  5. A review of solar-powered Stirling engines and low temperature differential Stirling engines

    Microsoft Academic Search

    Bancha Kongtragool; Somchai Wongwises

    2003-01-01

    This article provides a literature review on solar-powered Stirling engines and low temperature differential Stirling engines technology. A number of research works on the development of Stirling engines, solar-powered Stirling engines, and low temperature differential Stirling engines is discussed. The aim of this review is to find a feasible solution which may lead to a preliminary conceptual design of a

  6. Search Engines for Tomorrow's Scholars, Part Two

    ERIC Educational Resources Information Center

    Fagan, Jody Condit

    2012-01-01

    This two-part article considers how well some of today's search tools support scholars' work. The first part of the article reviewed Google Scholar and Microsoft Academic Search using a modified version of Carole L. Palmer, Lauren C. Teffeau, and Carrier M. Pirmann's framework (2009). Microsoft Academic Search is a strong contender when…

  7. Overheat Prevention in Solar-Powered Stirling Engines

    NASA Technical Reports Server (NTRS)

    Garrigus, W. E.; Pons, R. L.

    1982-01-01

    Proposed controller for solar-powered Stirling engine prevents engine from burning up when energy added by Sun exceeds that withdrawn by load. Head-temperature controller used existing electrical control unit of Stirling engine to regulate power output in response to head temperature. Power out-put is varied so keeps head temperature fairly constant.

  8. High voltage power supplies - An engineering overview

    Microsoft Academic Search

    James W. Williams

    1987-01-01

    This overview paper presents an engineering-oriented status and progress report on several high voltage power supply applications. Although high-reliability aerospace uses are the main topic, industrial and commercial applications are also described. Traveling-wave-tube (TWT) supplies for ECM and radar systems are described, as are cathode-ray tube (CRT) and laser supplies. An update to the author's 1980 'report card' on aerospace

  9. An advanced search engine for patent analytics in medicinal chemistry.

    PubMed

    Pasche, Emilie; Gobeill, Julien; Teodoro, Douglas; Gaudinat, Arnaud; Vishnykova, Dina; Lovis, Christian; Ruch, Patrick

    2012-01-01

    Patent collections contain an important amount of medical-related knowledge, but existing tools were reported to lack of useful functionalities. We present here the development of TWINC, an advanced search engine dedicated to patent retrieval in the domain of health and life sciences. Our tool embeds two search modes: an ad hoc search to retrieve relevant patents given a short query and a related patent search to retrieve similar patents given a patent. Both search modes rely on tuning experiments performed during several patent retrieval competitions. Moreover, TWINC is enhanced with interactive modules, such as chemical query expansion, which is of prior importance to cope with various ways of naming biomedical entities. While the related patent search showed promising performances, the ad-hoc search resulted in fairly contrasted results. Nonetheless, TWINC performed well during the Chemathlon task of the PatOlympics competition and experts appreciated its usability. PMID:22874181

  10. Two improved harmony search algorithms for solving engineering optimization problems

    NASA Astrophysics Data System (ADS)

    Jaberipour, Majid; Khorram, Esmaile

    2010-11-01

    This paper describes two new harmony search (HS) meta-heuristic algorithms for engineering optimization problems with continuous design variables. The key difference between these algorithms and traditional (HS) method is in the way of adjusting bandwidth (bw). bw is very important factor for the high efficiency of the harmony search algorithms and can be potentially useful in adjusting convergence rate of algorithms to optimal solution. First algorithm, proposed harmony search (PHS), introduces a new definition of bandwidth (bw). Second algorithm, improving proposed harmony search (IPHS) employs to enhance accuracy and convergence rate of PHS algorithm. In IPHS, non-uniform mutation operation is introduced which is combination of Yang bandwidth and PHS bandwidth. Various engineering optimization problems, including mathematical function minimization problems and structural engineering optimization problems, are presented to demonstrate the effectiveness and robustness of these algorithms. In all cases, the solutions obtained using IPHS are in agreement or better than those obtained from other methods.

  11. Hierarchical Structural Approach to Improving the Browsability of Web Search Engine Results

    E-print Network

    Zaiane, Osmar R.

    Hierarchical Structural Approach to Improving the Browsability of Web Search Engine Results Hang,zaiane}@cs.ualberta.ca Abstract Web users have been mainly relying on Web search engines to find information of interest on the Web. However, two key issues remain with traditional Web search engines: the browsability of searching

  12. A Search Engine for Mathematical Michael Kohlhase and Ioan A. Sucan

    E-print Network

    Kohlhase, Michael

    A Search Engine for Mathematical Formulae Michael Kohlhase and Ioan A. S¸ucan Computer Science engine for mathematical formulae. The MathWebSearch system harvests the web for content representationsWebSearch that is similar to a standard search engine like Google, except that it can retrieve content representations

  13. A Study of Using Search Engine Page Hits as a Proxy for n-gram Frequencies

    E-print Network

    Hearst, Marti

    A Study of Using Search Engine Page Hits as a Proxy for n-gram Frequencies Preslav Nakov and Marti the variability in the n-gram counts across different search engines as well as for the same search en- gine is getting increasingly popular. Most often this means using Web search engine page hit counts as estimates

  14. Using clustering and visualization for refining the results of a WWW image search engine

    Microsoft Academic Search

    Sougata Mukherjea; Kyoji Hirata; Yoshinori Hara

    1998-01-01

    Search engines are useful because they allow the user to find information of interest from the World-Wide Web. We have developed a WWW search engine called AMORE that allows users to find images on the Web. However, like textual search engines, AMORE sometimes retrieves a lot of results. Showing the retrieved images as pages of scrolled list, like other search

  15. Guidelines for Web Search Engines: From Searching and Filtering to Interface

    Microsoft Academic Search

    Markos Papoutsidakis; Stavroula Sampati; Ioannis Ledakis; Afroditi Sotiropoulou; Stavros Giannopoulos

    2007-01-01

    In this paper we address a set of important guidelines that web search engines should follow in order to become effective.\\u000a We refer to the importance of semantic web in the section of search engines which comes up from the better set-up that ontologies\\u000a offer. Moreover, some of the most known and adaptive learning techniques are described in order to

  16. A method to assess search engine results

    Microsoft Academic Search

    Judit Bar-Ilan; Mark Levene

    2011-01-01

    Purpose – The aim of this paper is to develop a methodology for assessing search results retrieved from different sources. Design\\/methodology\\/approach – This is a two phase method, where in the first stage users select and rank the ten best search results from a randomly ordered set. In the second stage they are asked to choose the best pre-ranked result

  17. Can Search Engines Be Used as Tools for Web-Link Analysis? A Critical View.

    ERIC Educational Resources Information Center

    Snyder, Herbert; Rosenbaum, Howard

    1999-01-01

    Investigates problems of using commercial search engines for Web-based research. Findings indicate that search engines are highly variable in their results, are limited in the search functions they offer, have poorly and/or incorrectly documented functions, use search logics that are opaque, and change search functions they offer over time.…

  18. 40 CFR 1054.140 - What is my engine's maximum engine power and displacement?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 2012-07-01 false What is my engine's maximum engine power and displacement? 1054.140 Section 1054...EMISSIONS FROM NEW, SMALL NONROAD SPARK-IGNITION ENGINES AND EQUIPMENT Emission Standards and Related...

  19. 40 CFR 1054.140 - What is my engine's maximum engine power and displacement?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 2013-07-01 false What is my engine's maximum engine power and displacement? 1054.140 Section 1054...EMISSIONS FROM NEW, SMALL NONROAD SPARK-IGNITION ENGINES AND EQUIPMENT Emission Standards and Related...

  20. Integrating search engines with data mining for customer-oriented information search

    Microsoft Academic Search

    Tim France; Dave Yen; Jyun-cheng Wang; Chia-ming Chang

    2002-01-01

    In recent years, the World Wide Web (WWW) has become incredibly popular in homes and offices alike. Consumers need to search for relevant information to help solve purchasing problems on various Web sites. Although there is no question that great numbers of WWW users will continue using search engines for information retrieval, consumers still hesitate before making a final decision,

  1. Asian Studies WWW VL Search Engines: Pt 1

    NSDL National Science Digital Library

    Yet another resource from online Asian Studies-guru T. Matthew Ciolek of the Australian National University, this dedicated search engine accesses "major Asian Studies' research resources recorded by the HotBot database." The engine covers the Websites of ten established Asian Studies organizations (asianart.com; coombs.anu.edu.au; iias.leidenuniv.nl; menic.utexas.edu; sun.sino.uni-heidelberg.de; www.aasianst.org; www.asian.gu.edu.au; www.asiasociety.org; www.ciolek.com; and www.ias.berkeley.edu), and search returns include brief annotations. The page also provides links to sixteen Asian Pacific country-specific search engines. Asia Pacific Research Online, Ciolek's main page, offers links to his array of online information resources and special projects.

  2. Heat engine development for solar thermal power systems

    NASA Technical Reports Server (NTRS)

    Pham, H. Q.; Jaffe, L. D.

    1981-01-01

    The parabolic dish solar collector systems for converting sunlight to electrical power through a heat engine will, require a small heat engine of high performance long lifetime to be competitive with conventional power systems. The most promising engine candidates are Stirling, high temperature Brayton, and combined cycle. Engines available in the current market today do not meet these requirements. The development of Stirling and high temperature Brayton for automotive applications was studied which utilizes much of the technology developed in this automotive program for solar power engines. The technical status of the engine candidates is reviewed and the components that may additional development to meet solar thermal system requirements are identified.

  3. Centre Hydraulic Power Supply Unit University of Saskatchewan -Mechanical Engineering Fluid Power and Controls

    E-print Network

    Saskatchewan, University of

    Centre Hydraulic Power Supply Unit University of Saskatchewan - Mechanical Engineering ­ Fluid Power and Controls ID: FP0003 Rev: 001 Date: May 31, 2010 Page: 1 of 7 Centre Hydraulic Power Supply;Centre Hydraulic Power Supply Unit University of Saskatchewan - Mechanical Engineering ­ Fluid Power

  4. TITAN: A Cross-linguistic Search Engine for the WWW

    Microsoft Academic Search

    Yoshihiko Hayashi; Seiji Susaki; Hikari-no-Oka Yokosuka

    1997-01-01

    Although various search services are available on the World-Wide Web, there are only a few services that can help people access web pages in a foreign language. In order to solve this problem we have developed a cross-linguistic WWW search engine, TITAN l, which provides users with an interface to query in their na~ tire languages (e.g.,Japanese) while performing multi-

  5. Web Search Engines FAQS: Questions, Answers, and Issues

    NSDL National Science Digital Library

    Price, Gary.

    The October issue of Searcher magazine offers this article by Gary Price, Web searcher extraordinaire (see the October 3, 1997 Scout Report). The article, which "reviews the latest goings on in the search world and tries to provide some suggestions and tools to make you more knowledgeable and save you some time," is, as one might expect from Price, clear and detailed in its review of the latest in search engines and the like. Running down the side of the page are "Price's Priceless Tips," including Ten Things to Know about Google (AllTheWeb, Altavista, etc.) and information on new search tools. There is a wealth of useful information here.

  6. ARIZONA STATE UNIVERSITY POWER SYSTEMS ENGINEERING RESEARCH CENTER

    E-print Network

    ARIZONA STATE UNIVERSITY POWER SYSTEMS ENGINEERING RESEARCH CENTER SYMBOLIC DYNAMIC MODELS to formulate the model. The model might be used in routine power engineering applications such as power flow 2.3 Coding a signal in Symbolic Dynamics . . 16 2.4 Dictionary formation . . . . . 17 2.5 Comparison

  7. Expert system applications to power engineering control design

    Microsoft Academic Search

    Thierry F. Godart; H. B. Puttgen; John F. Jansen

    1990-01-01

    The feasibility of applying expert system methodologies to power engineering control design problems is addressed. First, the general concept of artificial intelligence (AI) implementation of design problem-solving techniques and the particular requirements for application to power engineering are discussed. Next, two expert systems, developed by the authors, are described: an expert system for the design of power plant auxiliary electrical

  8. An exploration of risk information search via a search engine: Queries and clicks in healthcare and information security

    Microsoft Academic Search

    Jingguo Wang; Nan Xiao; H. Raghav Rao

    The general public is increasingly using search engines to seek information on risks and threats. Based on a search log from a large search engine, spanning three months, this study explores user patterns of query submission and subsequent clicks in sessions, for two important risk related topics, healthcare and information security, and compares them to other randomly sampled sessions. We

  9. SASE: Implementation of a Compressed Text Search Engine Srinidhi Varadarajan Tzicker Chiueh

    E-print Network

    Chiueh, Tzi-cker

    SASE: Implementation of a Compressed Text Search Engine Srinidhi Varadarajan Tzi­cker Chiueh (SASE) framework which unites text compression and indexing to maximize keyword search performance while compressed text without explicit decompression. The implementation includes a search server architecture

  10. Spying Out Accurate User Preferences for Search Engine Adaptation

    E-print Network

    Ng, Wilfred Siu Hung

    Spying Out Accurate User Preferences for Search Engine Adaptation Lin Deng, Wilfred Ng, Xiaoyong a novel algorithm called "Spy Na¨ive Bayes" (SpyNB) to identify user preferences generated from not clicked by the users as unlabelled data. Then, we plant the sure positive examples (the spies

  11. Detecting influenza epidemics using search engine Jeremy Ginsberg1

    E-print Network

    Tomkins, Andrew

    Detecting influenza epidemics using search engine query data Jeremy Ginsberg1 , Matthew H. Mohebbi1 for Disease Control and Prevention Epidemics of seasonal influenza are a major public health concern, causing . In addition to seasonal influenza, a new strain of influenza virus against which no prior immunity exists

  12. Genre Classification of Websites Using Search Engine Snippets

    E-print Network

    Genre Classification of Websites Using Search Engine Snippets Suhit Gupta Columbia University 500 W, but also allow for easier clustering of websites. We use existing techniques like Manhattan distance the body of an article, which distracts a user from actual content. Automatic extraction of "useful

  13. Query Processing in Highly-Loaded Search Engines

    E-print Network

    Orlando, Salvatore

    `a Ca'Foscari of Venice 2 ISTI-CNR of Pisa 3 University of Glasgow firstname.surname@unive.it, firstname.surname@isti.cnr.it, firstname.surname@glasgow.ac.uk Abstract. While Web search engines are built to cope with a large number

  14. A GRAPH BASED APPROACH TO COMPARING SEARCH ENGINES

    Microsoft Academic Search

    Jinghao Miao; Daniel Berleant

    2003-01-01

    In the investigation of paragraph-linked hypertext repositories, the algorithms generating link networks have in-depth impacts on the phenomena of centrality or dispersion that are identified as important issues to be dealt with in the process of information foraging. Furthermore different repositories, generated through different search engines, even produced by the same algorithms, still shown significant variations with different degrees of

  15. A Parametric Architecture for Tags Clustering in Folksonomic Search Engines

    Microsoft Academic Search

    Nicola Raffaele Di Matteo; Silvio Peroni; Fabio Tamburini; Fabio Vitali

    2009-01-01

    Semantic search engines rely on the existence of a rich set of semantic connections between the concepts associated to documents and those used for the queries. With folksonomies, this is not always guaranteed. Creating clusters of folksonomic tags around terms of controlled ontological vocabularies is a potentially sophisticated approach, but algorithms abound for this clustering and no clear cut winner

  16. Robots & Spiders & Crawlers: How Web and intranet search engines

    E-print Network

    Suel, Torsten

    Robots & Spiders & Crawlers: How Web and intranet search engines follow links to build indexes for these programs are spider or crawler (because they follow links on the Web), worm, wanderer, gatherer, and so on discussed are potential problems that spiders may have with certain types of content and how to overcome

  17. Optimizing Search Engines using Clickthrough Data Thorsten Joachims

    E-print Network

    Keinan, Alon

    information retrieval system should present relevant documents high in the ranking, with less relevant could use this as training data for optimizing (and even personal- izing) the retrieval function to automatically optimiz- ing the retrieval quality of search engines using clickthrough data. Intuitively, a good

  18. Visualizing World-Wide Web Search Engine Results

    Microsoft Academic Search

    Sougata Mukherjea; Yoshinori Hara

    1999-01-01

    Most of the popular WWW search engines show the documents that match the users' queries as pages of scrolled lists. If lots of information is retrieved, this is not very user friendly. Moreover, there is no mechanism to easily determine documents linked to the retrieved documents or keywords related to the query terms. The paper presents a system that allows

  19. A Novel Interdisciplinary Approach to Deep Web Search Engine

    Microsoft Academic Search

    Pyke Tin; Thi Thi Zin; Hiromitsu Hama

    Summary In this paper, we will discuss on the strategic issues of exploring, harvesting and integrating the Deep Web. We will then develop a novel interdisciplinary stochastic model for a Deep Web Search Engine which can detect and rank the contents optimally. Our efforts aim at opening up to users by building Generator. On this information grand voyage, the Generator

  20. A Dataset Search Engine for the Research Document Corpus

    E-print Network

    Cormode, Graham

    A Dataset Search Engine for the Research Document Corpus Meiyu Lu # , Srinivas Bangalore , Graham a proposed idea or system is to evaluate over a suitable dataset. However, to this date there have been no useful tools for researchers to understand which datasets have been used for what purpose, or in what

  1. A Dataset Search Engine for the Research Document Corpus

    E-print Network

    Fisher, Kathleen

    A Dataset Search Engine for the Research Document Corpus Meiyu Lu # , Srinivas Bangalore , Graham no useful tools for researchers to understand which datasets have been used for what purpose, or in what prior work. Instead, they have to manually browse through papers to find suitable datasets

  2. Virage Image Search Engine: An Open Framework for Image Management

    Microsoft Academic Search

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

    1996-01-01

    Until recently, the management of large image databases has relied exclusively on manually entered alphanumeric annotations. Systems are beginning to emerge in both the research and commercial sectors based on 'content-based' image retrieval, a technique which explicitly manages image assets by directly representing their visual attributes. The Virage image search engine provides an open framework for building such systems. The

  3. A Competitive and Experiential Assignment in Search Engine Optimization Strategy

    ERIC Educational Resources Information Center

    Clarke, Theresa B.; Clarke, Irvine, III

    2014-01-01

    Despite an increase in ad spending and demand for employees with expertise in search engine optimization (SEO), methods for teaching this important marketing strategy have received little coverage in the literature. Using Bloom's cognitive goals hierarchy as a framework, this experiential assignment provides a process for educators who may be…

  4. A Survey of Search Engine Capabilities Useful in Data Mining.

    ERIC Educational Resources Information Center

    Thelwall, Mike

    2001-01-01

    Provides an up-to-date survey of the capabilities of the major 16 search engines with respect to the types of information extraction tasks that would be useful in Web data mining and cybermetrics, and analyzes two sets of domain counts for internal consistency between results. (AEF)

  5. SPARK: A Keyword Search Engine on Relational Databases

    E-print Network

    Lin, Xuemin

    SPARK: A Keyword Search Engine on Relational Databases Yi Luo, Wei Wang, Xuemin Lin School on imdb.com and cannot find any relevant answer (See Figure 1(a)). SPARK is a system that we developed to the query. For example, we show the top-3 results for the same query returned by the SPARK system populated

  6. The Effectiveness of Web Search Engines to Index New Sites from Different Countries

    ERIC Educational Resources Information Center

    Pirkola, Ari

    2009-01-01

    Introduction: Investigates how effectively Web search engines index new sites from different countries. The primary interest is whether new sites are indexed equally or whether search engines are biased towards certain countries. If major search engines show biased coverage it can be considered a significant economic and political problem because…

  7. Search engine user behaviour: How can users be guided to quality content?

    Microsoft Academic Search

    Dirk Lewandowski

    2008-01-01

    The typical behaviour of the Web search engine user is widely known: a user only types in one or a few keywords and expects the search engine to produce relevant results in an instant. Search engines not only adapt to this behaviour. On the contrary, they are often faced with criticism that they themselves created this kind of behaviour. As

  8. A game theory-based analysis of search engine non-neutral behavior

    E-print Network

    Paris-Sud XI, Université de

    , a search engine can effectively exclude nascent websites from both advertising and sales revenue. Another and accessed by a search engine user. A simple game theory-based model is presented where both a search engine and a content provider interact strategically, and the aggregated behavior of users is modeled by a demand

  9. Electrical Engineering and Computer Science Department PowerMod: An Open Source, Configurable Power Harvesting and

    E-print Network

    Dinda, Peter A.

    Electrical Engineering and Computer Science Department PowerMod: An Open Source, Configurable Power and currents. PowerMod has been de- signed to be used by developers who are not electrical engineers or power;6.3 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 6.4 Printed

  10. International Security Network (ISN) Limited Area Search Engine (LASE)

    NSDL National Science Digital Library

    ISN, the International Relations and Security Network (described in the June 16, 1998 Scout Report for Social Sciences), has recently introduced an extremely useful full text Limited Area Search Engine (LASE) in the field of international relations and security. The Eurospider search engine behind ISN LASE currently searches and retrieves documents from 150 selected sites; supports English, French, German, and Italian; and offers options such as "high-quality ranklists, highlighting of matched query terms, relevance feedback, and other advanced features." In addition to a very speedy retrieval of selected documents, the ISN LASE provides links to the original source. The ISN's guidelines for selecting sites to include in the LASE are listed in the ISN LASE Policies section.

  11. Through the Google Goggles: Sociopolitical Bias in Search Engine Design

    NASA Astrophysics Data System (ADS)

    Diaz, A.

    Search engines like Google are essential to navigating the Web's endless supply of news, political information, and citizen discourse. The mechanisms and conditions under which search results are selected should therefore be of considerable interest to media scholars, political theorists, and citizens alike. In this chapter, I adopt a "deliberative" ideal for search engines and examine whether Google exhibits the "same old" media biases of mainstreaming, hypercommercialism, and industry consolidation. In the end, serious objections to Google are raised: Google may favor popularity over richness; it provides advertising that competes directly with "editorial" content; it so overwhelmingly dominates the industry that users seldom get a second opinion, and this is unlikely to change. Ultimately, however, the results of this analysis may speak less about Google than about contradictions in the deliberative ideal and the so-called "inherently democratic" nature of the Web.

  12. Using Heuristic-Search Based Engines for Estimating Human Skill at Chess 71 Using Heuristic-Search Based Engines for Estimating Human Skill at Chess

    E-print Network

    Guid, Matej

    Using Heuristic-Search Based Engines for Estimating Human Skill at Chess 71 Using Heuristic-Search Establishing heuristic-search based chess programs as appropriate tools for estimating human skill levels of the differences between heuristic-search based programs in estimating chess skill. We used four different chess

  13. 22. Power plant engine pipingcompressed air piping diagram and sections, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    22. Power plant engine piping-compressed air piping diagram and sections, sheet 81 of 130 - Naval Air Station Fallon, Power Plant, 800 Complex, off Carson Road near intersection of Pasture & Berney Roads, Fallon, Churchill County, NV

  14. 21. Power plant engine fuel oil piping diagrams, sheet 83 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    21. Power plant engine fuel oil piping diagrams, sheet 83 of 130 - Naval Air Station Fallon, Power Plant, 800 Complex, off Carson Road near intersection of Pasture & Berney Roads, Fallon, Churchill County, NV

  15. A new compression ignition engine concept for high power density

    SciTech Connect

    Clarke, J.M.; Berlinger, W.G. [Caterpillar Inc., Peoria, IL (United States). Engine Research Dept.

    1996-12-31

    A new compression ignition (CI) engine concept has been identified which greatly improves power density over conventional CI engines. This papers reviews the scaling laws as they apply to power density (power/crate volume) and derives a parameter reflecting the compactness of any engine design. The new concept is compared to existing engines on the basis of his parameter. Ideal cycle analysis of the multi-stage thermodynamic processes inherent in the new arrangement leads to the expectation that this engine will be more efficient than current engines. Real cycle simulations and concept design work have confirmed that efficiency can be at least as high as current engines while size is much reduced. Design and analysis are continuing in order to establish that the durability and low emissions will be competitive with modern CI engines.

  16. Faculty Search Materials Science and Engineering

    E-print Network

    Virginia Tech

    to fill a tenure track faculty position at the Assistant/Associate Professor level. A doctoral degree levels. Candidates with research interests in all areas of polymer engineering/polymer science of polymeric membrane materials, polymeric based composites and nanocomposites, or advanced polymer

  17. Power booster internal combustion engine flywheel

    SciTech Connect

    Dingess, B.E.

    1989-08-08

    This patent describes a flywheel apparatus for an internal combustion engine. The engine comprises a crankshaft, a cam shaft, a means of advancing the crankshaft in rotation on the power strokes to that of the flywheel, means of retarding the crankshaft on the compression strokes the flywheel. The apparatus further comprising, a first flywheel, linkage means connecting a flywheel shaft to the crankshaft, a first flywheel housing, bearing means of linking the first flywheel to the flywheel shaft, a plurality of cylinders housed to the first flywheel housing, a plurality of nitrogen charged bladders housed within the cylinders, a plurality of cam action rods housed within the cylinders, a cam housed to the flywheel shaft, linkage means linking the cam action rods to the bladders, second linkage means linking the cam action rods by way of a cam roller to the cam, a freewheeling flywheel housing, bearing means linking the freewheeling flywheel to the flywheel shaft, third linkage means linking a freewheeling clutch between the freewheeling flywheel housing and the flywheel shaft, a shifter apparatus comprising means of locking the first flywheel housing to the freewheeling flywheel housing in a first position, means of connecting the flywheel shaft and the freewheeling flywheel housing by way of the freewheeling clutch in a second position, a front flywheel comprising means of driving the cam shaft at a balanced rotational speed from the crankshaft when the crankshaft is rotating at varying rotational speeds within each revolution of the crankshaft.

  18. Towards Next-Generation Search Engines and Browsers - Search Beyond Media Types and Places

    Microsoft Academic Search

    Katsumi Tanaka

    2006-01-01

    In this keynote talk, the author will describe concepts and technologies for next-generation search engines and browsers for\\u000a searching and browsing contents beyond media types and places. Currently, digital content are represented by different media\\u000a such as text, images, video etc. Also, digital content are created, stored and used on a variety of places (devices) such\\u000a as independent digital archives,

  19. A Search Engine That's Aware of Your Needs

    NASA Technical Reports Server (NTRS)

    2005-01-01

    Internet research can be compared to trying to drink from a firehose. Such a wealth of information is available that even the simplest inquiry can sometimes generate tens of thousands of leads, more information than most people can handle, and more burdensome than most can endure. Like everyone else, NASA scientists rely on the Internet as a primary search tool. Unlike the average user, though, NASA scientists perform some pretty sophisticated, involved research. To help manage the Internet and to allow researchers at NASA to gain better, more efficient access to the wealth of information, the Agency needed a search tool that was more refined and intelligent than the typical search engine. Partnership NASA funded Stottler Henke, Inc., of San Mateo, California, a cutting-edge software company, with a Small Business Innovation Research (SBIR) contract to develop the Aware software for searching through the vast stores of knowledge quickly and efficiently. The partnership was through NASA s Ames Research Center.

  20. SearchResultFinder: Federated Search Made Easy Dolf Trieschnigg, Kien Tjin-Kam-Jet and Djoerd Hiemstra

    E-print Network

    Hiemstra, Djoerd

    SearchResultFinder: Federated Search Made Easy Dolf Trieschnigg, Kien Tjin-Kam-Jet and Djoerd Building a federated search engine based on a large number existing web search engines is a challenge, Scraper, Wrapper, Search result extraction 1. INTRODUCTION Federated search engines combine the power

  1. Automatic Extraction of Dynamic Record Sections From Search Engine Result Pages

    E-print Network

    Meng, Weiyi

    [18, 26], deep web crawlers [20] and shopping agents, need to interact with search engines. Thus and maintenance of metasearch engines and deep Web crawling. 1. INTRODUCTION A recent survey reveals that there are hundreds of thousands of search engines on the Web [8]. Many web applications, such as metasearch engines

  2. Spacecraft Power Systems Engineering: Solutions for NASA's Manned Space Program

    NASA Technical Reports Server (NTRS)

    Scott, John H.

    2007-01-01

    An overview of spacecraft power systems is presented, with a focus on applications in the manned space program. The topics include: 1) History; 2) State-of-the-art; 3) Development directions; 4) Focus on applications in the manned space program led from JSC; 5) Power Systems Engineering Trade Space; 6) Power Generation and Energy Storage; 7) Power Distribution and Control; and 8) Actuation

  3. Full Elastic Waveform Search Engine for Near Surface Imaging

    NASA Astrophysics Data System (ADS)

    Zhang, J.; Zhang, X.

    2014-12-01

    For processing land seismic data, the near-surface problem is often very complex and may severely affect our capability to image the subsurface. The current state-of-the-art technology for near surface imaging is the early arrival waveform inversion that solves an acoustic wave-equation problem. However, fitting land seismic data with acoustic wavefield is sometimes invalid. On the other hand, performing elastic waveform inversion is very time-consuming. Similar to a web search engine, we develop a full elastic waveform search engine that includes a large database with synthetic elastic waveforms accounting for a wide range of interval velocity models in the CMP domain. With each CMP gather of real data as an entry, the search engine applies Multiple-Randomized K-Dimensional (MRKD) tree method to find approximate best matches to the entry in about a second. Interpolation of the velocity models at CMP positions creates 2D or 3D Vp, Vs, and density models for the near surface area. The method does not just return one solution; it gives a series of best matches in a solution space. Therefore, the results can help us to examine the resolution and nonuniqueness of the final solution. Further, this full waveform search method can avoid the issues of initial model and cycle skipping that the method of full waveform inversion is difficult to deal with.

  4. Engines and propellers for powered gliders and light airplanes

    NASA Technical Reports Server (NTRS)

    Gropp, H

    1938-01-01

    The object of the present paper is to consider the interaction of engine, propeller, and airplane for the low-power range. The discussion is presented in a form so as to provide the engine builder with a basis in his selection in the type of engine required, a suitable selection being possible only in connection with considerations on the best possible propeller.

  5. Next-Generation Search Engines for Information Retrieval

    SciTech Connect

    Devarakonda, Ranjeet [ORNL; Hook, Leslie A [ORNL; Palanisamy, Giri [ORNL; Green, James M [ORNL

    2011-01-01

    In the recent years, there have been significant advancements in the areas of scientific data management and retrieval techniques, particularly in terms of standards and protocols for archiving data and metadata. Scientific data is rich, and spread across different places. In order to integrate these pieces together, a data archive and associated metadata should be generated. Data should be stored in a format that can be retrievable and more importantly it should be in a format that will continue to be accessible as technology changes, such as XML. While general-purpose search engines (such as Google or Bing) are useful for finding many things on the Internet, they are often of limited usefulness for locating Earth Science data relevant (for example) to a specific spatiotemporal extent. By contrast, tools that search repositories of structured metadata can locate relevant datasets with fairly high precision, but the search is limited to that particular repository. Federated searches (such as Z39.50) have been used, but can be slow and the comprehensiveness can be limited by downtime in any search partner. An alternative approach to improve comprehensiveness is for a repository to harvest metadata from other repositories, possibly with limits based on subject matter or access permissions. Searches through harvested metadata can be extremely responsive, and the search tool can be customized with semantic augmentation appropriate to the community of practice being served. One such system, Mercury, a metadata harvesting, data discovery, and access system, built for researchers to search to, share and obtain spatiotemporal data used across a range of climate and ecological sciences. Mercury is open-source toolset, backend built on Java and search capability is supported by the some popular open source search libraries such as SOLR and LUCENE. Mercury harvests the structured metadata and key data from several data providing servers around the world and builds a centralized index. The harvested files are indexed against SOLR search API consistently, so that it can render search capabilities such as simple, fielded, spatial and temporal searches across a span of projects ranging from land, atmosphere, and ocean ecology. Mercury also provides data sharing capabilities using Open Archive Initiatives Protocol for Metadata Handling (OAI-PMH). In this paper we will discuss about the best practices for archiving data and metadata, new searching techniques, efficient ways of data retrieval and information display.

  6. Engineering services to support operating nuclear power plants

    Microsoft Academic Search

    Pendergrass

    1985-01-01

    The utilization of contract engineering services by Arkansas Power and Light (AP and L) has significantly changed in scope over the last several months. Immediately after the Three Mile Island (TMI) incident in 1979, each utility with operational nuclear power plants suddenly needed large blocks of contractor engineering manhours to satisfy the emerging regulations. The work included the development, design,

  7. Nuclear Engineering Technologists in the Nuclear Power Era

    ERIC Educational Resources Information Center

    Wang, C. H.; And Others

    1974-01-01

    Describes manpower needs in nuclear engineering in the areas of research and development, architectural engineering and construction supervision, power reactor operations, and regulatory tasks. Outlines a suitable curriculum to prepare students for the tasks related to construction and operation of power reactors. (GS)

  8. Design and Implementation of a Threaded Search Engine for Tour Recommendation Systems

    NASA Astrophysics Data System (ADS)

    Lee, Junghoon; Park, Gyung-Leen; Ko, Jin-Hee; Shin, In-Hye; Kang, Mikyung

    This paper implements a threaded scan engine for the O(n!) search space and measures its performance, aiming at providing a responsive tour recommendation and scheduling service. As a preliminary step of integrating POI ontology, mobile object database, and personalization profile for the development of new vehicular telematics services, this implementation can give a useful guideline to design a challenging and computation-intensive vehicular telematics service. The implemented engine allocates the subtree to the respective threads and makes them run concurrently exploiting the primitives provided by the operating system and the underlying multiprocessor architecture. It also makes it easy to add a variety of constraints, for example, the search tree is pruned if the cost of partial allocation already exceeds the current best. The performance measurement result shows that the service can run even in the low-power telematics device when the number of destinations does not exceed 15, with an appropriate constraint processing.

  9. Refining comparative proteomics by spectral counting to account for shared peptides and multiple search engines

    PubMed Central

    Chen, Yao-Yi; Dasari, Surendra; Ma, Ze-Qiang; Vega-Montoto, Lorenzo J.; Li, Ming

    2013-01-01

    Spectral counting has become a widely used approach for measuring and comparing protein abundance in label-free shotgun proteomics. However, when analyzing complex samples, the ambiguity of matching between peptides and proteins greatly affects the assessment of peptide and protein inventories, differentiation, and quantification. Meanwhile, the configuration of database searching algorithms that assign peptides to MS/MS spectra may produce different results in comparative proteomic analysis. Here, we present three strategies to improve comparative proteomics through spectral counting. We show that comparing spectral counts for peptide groups rather than for protein groups forestalls problems introduced by shared peptides. We demonstrate the advantage and flexibility of this new method in two datasets. We present four models to combine four popular search engines that lead to significant gains in spectral counting differentiation. Among these models, we demonstrate a powerful vote counting model that scales well for multiple search engines. We also show that semi-tryptic searching outperforms tryptic searching for comparative proteomics. Overall, these techniques considerably improve protein differentiation on the basis of spectral count tables. PMID:22552787

  10. Cogeneration of ethanol from I. C. engine power plants

    SciTech Connect

    Noon, R.

    1980-01-01

    I.C. engine power plants have significant and suitable waste heat for the production of ethanol. Such power plants are often located in conjunction with cattle and grain producing areas, two of the important ingredients for ethanol production. Cogeneration of ethanol from I.C. engines will afford significant production of ethanol without requiring more fuel than is currently used. A one megawatt peak electrical output rated I.C. engine could produce 250,000 gallons of anhydrous ethanol per year.

  11. A Fuzzy Integral Method to Merge Search Engine Results on Web

    Microsoft Academic Search

    Shuning Cui; Boqin Feng

    2005-01-01

    \\u000a Distributed information retrieval searches information among many disjoint databases or search engine results and merge of\\u000a retrieved results into a single result list that a person can browse easily. How to merge the results returned by selected\\u000a search engine is an important subproblem of the distributed information retrieval task, because every search engine has its\\u000a own calculation or definition about

  12. The role of a dedicated power research center in meeting the future trends in power engineering

    Microsoft Academic Search

    Steinar J. Dale

    2006-01-01

    Summary form only given. This panel presentation addresses the role of a dedicated power engineering research center in meeting the future trends in power engineering education, research, and career. In particular, the example of the newly established Center for Advanced Power Systems (CAPS) at Florida State University, Tallahassee, FL will be provided. CAPS was established in 2000 at FSU with

  13. First 20 Precision among World Wide Web Search Services (Search Engines).

    ERIC Educational Resources Information Center

    Leighton, H. Vernon; Srivastava, Jaideep

    1999-01-01

    Compares five World Wide Web search engines for precision on the first 20 results returned for 15 queries, adding weight for ranking effectiveness. Discusses methods to lessen evaluator bias, evaluation criteria, definition of relevance, experimental design, the structure of queries, and future work. (Author/LRW)

  14. Finding Business Information on the "Invisible Web": Search Utilities vs. Conventional Search Engines.

    ERIC Educational Resources Information Center

    Darrah, Brenda

    Researchers for small businesses, which may have no access to expensive databases or market research reports, must often rely on information found on the Internet, which can be difficult to find. Although current conventional Internet search engines are now able to index over on billion documents, there are many more documents existing in…

  15. Lifted Search Engines for SatisÞability

    Microsoft Academic Search

    Andrew J. Parkes

    1999-01-01

    There are several powerful solvers for satisÞability (SAT), such as wsat, Davis-Putnam, and relsat. However, in practice, the SAT encodings often have so many clauses that we exceed physical memory resources on attempting to solve them. This excessive size often arises because conversion to SAT, from a more natural encoding using quantiÞca- tions over domains, requires expanding quantiÞers. This suggests

  16. Improving Free-Piston Stirling Engine Specific Power

    NASA Technical Reports Server (NTRS)

    Briggs, Maxwell H.

    2015-01-01

    This work uses analytical methods to demonstrate the potential benefits of optimizing piston and/or displacer motion in a Stirling engine. Isothermal analysis was used to show the potential benefits of ideal motion in ideal Stirling engines. Nodal analysis is used to show that ideal piston and displacer waveforms are not optimal in real Stirling engines. Constrained optimization was used to identify piston and displacer waveforms that increase Stirling engine specific power.

  17. Inside the supernova: A powerful convective engine

    NASA Astrophysics Data System (ADS)

    Herant, Marc; Benz, Willy; Hix, W. Raphael; Fryer, Chris L.; Colgate, Stirling A.

    1994-11-01

    We present an extensive study of the inception of supernova explosions by following the evolution of the cores of two massive stars (15 and 25 Solar mass) in multidimension. Our calculations begin at the onset of core collapse and stop several hundred milliseconds after the bounce, at which time successful explosions of the appropriate magnitude have been obtained. Similar to the classical delayed explosion mechanism of Wilson, the explosion is powered by the heating of the envelope due to neutrinos emitted by the protoneutron star as it radiates the gravitational energy liberated by the collapse. However, as was shown by Herant, Benz, & Colgate, this heating generates strong convection outside the neutrinosphere, which we demonstrate to be critical to the explosion. By breaking a purely stratified hydrostatic equilibrium, convection moves the nascent supernova away from a delicate radiative equilibrium between neutrino emission and absorption, Thus, unlike what has been observed in one-dimensional calculations, explosions are rendered quite insensitive to the details of the physical input parameters such as neutrino cross sections or nuclear equation of state parameters. As a confirmation, our comparative one-dimensional calculations with identical microphysics, but in which convection cannot occur, lead to dramatic failures. Guided by our numerical results, we have developed a paradigm for the supernova explosion mechanism. We view a supernova as an open cycle thermodynamic engine in which a reservoir of low-entropy matter (the envelope) is thermally coupled and physically connected to a hot bath (the protoneutron star) by a neutrino flux, and by hydrodynamic instabilities. This paradigm does not invoke new or modified physics over previous treatments, but relies on compellingly straightforward thermodynamic arguments. It provides a robust and self-regulated explosion mechanism to power supernovae that is effective under a wide range of physical parameters.

  18. Inside the supernova: A powerful convective engine

    NASA Technical Reports Server (NTRS)

    Herant, Marc; Benz, Willy; Hix, W. Raphael; Fryer, Chris L.; Colgate, Stirling A.

    1994-01-01

    We present an extensive study of the inception of supernova explosions by following the evolution of the cores of two massive stars (15 and 25 Solar mass) in multidimension. Our calculations begin at the onset of core collapse and stop several hundred milliseconds after the bounce, at which time successful explosions of the appropriate magnitude have been obtained. Similar to the classical delayed explosion mechanism of Wilson, the explosion is powered by the heating of the envelope due to neutrinos emitted by the protoneutron star as it radiates the gravitational energy liberated by the collapse. However, as was shown by Herant, Benz, & Colgate, this heating generates strong convection outside the neutrinosphere, which we demonstrate to be critical to the explosion. By breaking a purely stratified hydrostatic equilibrium, convection moves the nascent supernova away from a delicate radiative equilibrium between neutrino emission and absorption, Thus, unlike what has been observed in one-dimensional calculations, explosions are rendered quite insensitive to the details of the physical input parameters such as neutrino cross sections or nuclear equation of state parameters. As a confirmation, our comparative one-dimensional calculations with identical microphysics, but in which convection cannot occur, lead to dramatic failures. Guided by our numerical results, we have developed a paradigm for the supernova explosion mechanism. We view a supernova as an open cycle thermodynamic engine in which a reservoir of low-entropy matter (the envelope) is thermally coupled and physically connected to a hot bath (the protoneutron star) by a neutrino flux, and by hydrodynamic instabilities. This paradigm does not invoke new or modified physics over previous treatments, but relies on compellingly straightforward thermodynamic arguments. It provides a robust and self-regulated explosion mechanism to power supernovae that is effective under a wide range of physical parameters.

  19. GENIE: A General Internet Search Engine for Atomic Data

    NSDL National Science Digital Library

    1969-12-31

    The Atomic and Molecular Data Unit, which operates within the Nuclear Data Section of the International Atomic Energy Agency in Vienna, Austria, maintains the General Internet Search Engine for Atomic Data (GENIE). The tool allows users to choose from two data types. The first is Oscillator Strengths and/or Transition Probabilities, which includes six databases. Users can specify the ion and the upper and lower wavelength limit. The other data is entitled Electron Impact Cross Sections and/or Rate Coefficients and contains two databases. For these data, users can choose the ion and the process of electron impact as either excitation or ionization. The ease of use and wealth of information that can be obtained from the search engine makes it a great tool for those looking for these specific data types.

  20. A New Approach for Scoring Relevant Documents by Applying a Farsi Stemming Method in Persian Web Search Engines

    NASA Astrophysics Data System (ADS)

    Shahbazi, Hamed; Mokhtaripour, Alireza; Dalvi, Mohammad; Tork Ladani, Behrouz

    In this paper, we will introduce a new approach for scoring Farsi (also called Persian) documents in a Persian Search engine. This approach is based on a new stemming method for Farsi language. Our new stemming method works without any dictionary. Evaluation results show significant improvement in performance (precision/ recall) of the Information Retrieval (IR) system using this stemmer. we have combine our stemming method with a mathematical scoring approach named FDS to obtain a powerful scoring policy for relevant documents in a Persian search engine.

  1. Initial Tests of a Thermoacoustic Space Power Engine

    Microsoft Academic Search

    Scott Backhaus

    2003-01-01

    Future NASA deep-space missions will require radioisotope-powered electric generators that are just as reliable as current RTGs, but more efficient and of higher specific power (W\\/kg). Thermoacoustic engines at the ~1-kW scale have converted high-temperature heat into acoustic, or PV, power without moving parts at 30% efficiency. Consisting of only tubes and a few heat exchangers, thermoacoustic engines are low

  2. The retrieval effectiveness of web search engines: considering results descriptions

    Microsoft Academic Search

    Dirk Lewandowski; Berliner Tor

    2008-01-01

    Purpose – The purpose of this paper is to compare five major web search engines (Google, Yahoo, MSN, Ask.com, and Seekport) for their retrieval effectiveness, taking into account not only the results, but also the results descriptions. Design\\/methodology\\/approach – The study uses real-life queries. Results are made anonymous and are randomized. Results are judged by the persons posing the original

  3. Discovering Implicit Feedbacks from Search Engine Log Files

    Microsoft Academic Search

    Ashok Veilumuthu; Parthasarathy Ramachandran

    2007-01-01

    A number of explicit and implicit feedback mechanisms have been proposed to improve the quality of the search engine results.\\u000a The current approaches to information retrieval depends heavily on the web linkage structure which is a form of relevance\\u000a judgment by the page authors. However, to overcome spamming attempts and the huge volumes of data, it is important to also

  4. The base engine for solar Stirling power

    Microsoft Academic Search

    R. J. Meijer; T. M. Godett

    1984-01-01

    A new concept in Stirling engine technology is embodied in the base engine now being developed at Stirling Thermal Motors, Inc. This is a versatile energy conversion unit suitable for many different applications and heat sources. The base engine, rated 40 kW at 2800 RPM, is a four-cylinder, double-acting variable displacement Stirling engine with pressurized crankcase and rotating shaft seal.

  5. 14 CFR 33.96 - Engine tests in auxiliary power unit (APU) mode.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...2014-01-01 2014-01-01 false Engine tests in auxiliary power unit (APU) mode. 33...AIRWORTHINESS STANDARDS: AIRCRAFT ENGINES Block Tests; Turbine Aircraft Engines § 33.96 Engine tests in auxiliary power unit (APU)...

  6. A search engine for the engineering and equipment data management system (EDMS) at CERN

    NASA Astrophysics Data System (ADS)

    Tsyganov, A.; Amérigo, S. M.; Petit, S.; Pettersson, T.; Suwalska, A.

    2008-07-01

    CERN, the European Laboratory for Particle Physics, located in Geneva -Switzerland, is currently building the LHC (Large Hadron Collider), a 27 km particle accelerator. The equipment life-cycle management of this project is provided by the Engineering and Equipment Data Management System (EDMS [1] [2]) Service. Using an Oracle database, it supports the management and follow-up of different kinds of documentation through the whole life cycle of the LHC project: design, manufacturing, installation, commissioning data etc... The equipment data collection phase is now slowing down and the project is getting closer to the 'As-Built' phase: the phase of the project consuming and exploring the large volumes of data stored since 1996. Searching through millions of items of information (documents, equipment parts, operations...) multiplied by dozens of points of view (operators, maintainers...) requires an efficient and flexible search engine. This paper describes the process followed by the team to implement the search engine for the LHC As-built project in the EDMS Service. The emphasis is put on the design decision to decouple the search engine from any user interface, potentially enabling other systems to also use it. Projections, algorithms, and the planned implementation are described in this paper. The implementation of the first version started in early 2007.

  7. Guided Google: A Meta Search Engine and its Implementation using the Google Distributed Web Services

    E-print Network

    Buyya, Rajkumar

    1 Guided Google: A Meta Search Engine and its Implementation using the Google Distributed Web in recent years. For instance, Google, which is one of the popular search engines, supports Web Services that allow external applications to issue Web search queries that are actually processed using a Google

  8. Study on question-answering system based on Meta search engine

    Microsoft Academic Search

    Feijuan Lil; Haiyan Kang; Yangsen Zhang; Wenjie SUI

    2010-01-01

    Meta search engine which can provide rich information is obviously an ideal source of answers to many types of questions. This paper describes a question answering system based on web, and puts forward to a new method to search information based on Meta search engine and new word discovery. In the information retrieval module, N-gram model and web pages which

  9. Integrating COTS Search Engines into Eclipse: Google Desktop Case Study Denys Poshyvanyk, Maksym Petrenko, Andrian Marcus

    E-print Network

    Poshyvanyk, Denys

    Integrating COTS Search Engines into Eclipse: Google Desktop Case Study Denys Poshyvanyk, Maksym (GDS) engine into the Eclipse development environment. The resulting tool, namely Google Eclipse Search (GES), provides enhanced searching in Eclipse software projects. The paper advocates for a COTS

  10. 14 CFR 25.363 - Side load on engine and auxiliary power unit mounts.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...2010-01-01 false Side load on engine and auxiliary power unit mounts. 25.363 Section... § 25.363 Side load on engine and auxiliary power unit mounts. (a) Each engine and auxiliary power unit mount and its...

  11. PulsedPower Transient Plasma: Energy, Engines, and

    E-print Network

    Levi, Anthony F. J.

    -32) #12;5Gundersen PulsedPower USC ONR 1990s Transient Plasma NO Removal Results Energy cost function of V1Gundersen PulsedPower USC Transient Plasma: Energy, Engines, and Aerospace Applications USC: Dan energy electrons in streamer head produce radicals, ions · Nsec pulsed power enables! Transient plasma

  12. Combined heat and power supply using Carnot engines

    Microsoft Academic Search

    J. H. Horlock

    1983-01-01

    The Marshall Report on the thermodynamic and economic feasibility of introducing large scale combined heat and electrical power generation (CHP) into the United Kingdom is summarized. Combinations of reversible power plant (Carnot engines) to meet a given demand of power and heat production are analyzed. The Marshall Report states that fairly large scale CHP plants are an attractive energy saving

  13. A multilingual usage consultation tool based on internet searching: more than a search engine, less than QA

    Microsoft Academic Search

    Kumiko Tanaka-Ishii; Hiroshi Nakagawa

    2005-01-01

    We present a usage consultation tool, based on Internet searching, for language learners. When a user enters a string of words for which he wants to find usages, the system sends this string as a query to a search engine and obtains search results about the string. The usages are extracted by performing statistical analysis on snippets and then fed

  14. Part power modeling of gas turbine engine systems

    SciTech Connect

    Morchower, S. [Univ. of Washington, Seattle, WA (United States). Dept. of Mechanical Engineering

    1995-12-31

    A method is developed for modeling the part power operation of the two-spool gas turbine engine using the simple and regenerative cycles. The approach is to replace the compressor map with a simple functional relation between the cycle pressure ratio and the peak temperature based on obtaining a reasonable operating line. In this way, the part power characteristics can be developed for cycles whose design parameters are varied. For engine systems for which part power operation is very important. The operation of multiple engines in combination is described.

  15. Anatomy of a News Archive and Search Engine (Optimized for Persian Web)

    Microsoft Academic Search

    Sayed Nasir Khalifehsoltani; Ali Vahdani; Reza Moallemi

    2009-01-01

    News search engines are a class of search engines which professionally monitor the web news. These engines usually provide their contents through extraction of news feeds. But news feeds are not fully supported by all news sources, especially the Persian ones. Another way is indexing the content of news pages where the results are less adequately accurate due to the

  16. Understanding Crowd-Powered Search Groups: A Social Network Perspective

    PubMed Central

    Zhang, Qingpeng; Wang, Fei-Yue; Zeng, Daniel; Wang, Tao

    2012-01-01

    Background Crowd-powered search is a new form of search and problem solving scheme that involves collaboration among a potentially large number of voluntary Web users. Human flesh search (HFS), a particular form of crowd-powered search originated in China, has seen tremendous growth since its inception in 2001. HFS presents a valuable test-bed for scientists to validate existing and new theories in social computing, sociology, behavioral sciences, and so forth. Methodology In this research, we construct an aggregated HFS group, consisting of the participants and their relationships in a comprehensive set of identified HFS episodes. We study the topological properties and the evolution of the aggregated network and different sub-groups in the network. We also identify the key HFS participants according to a variety of measures. Conclusions We found that, as compared with other online social networks, HFS participant network shares the power-law degree distribution and small-world property, but with a looser and more distributed organizational structure, leading to the diversity, decentralization, and independence of HFS participants. In addition, the HFS group has been becoming increasingly decentralized. The comparisons of different HFS sub-groups reveal that HFS participants collaborated more often when they conducted the searches in local platforms or the searches requiring a certain level of professional knowledge background. On the contrary, HFS participants did not collaborate much when they performed the search task in national platforms or the searches with general topics that did not require specific information and learning. We also observed that the key HFS information contributors, carriers, and transmitters came from different groups of HFS participants. PMID:22761888

  17. Agricultural Engineering Agriculture Power and Machinery Engineering Option

    E-print Network

    Lin, Zhiqun

    (Classical Physics II) 2 AE 218 (Project Mgmt and Design) 3 Agron 154 (Soil Science) 3 EM 324 (Mechanics Lab) 3 AGRON 154 (Soil Science) 3 Engl 250 (WOVE Comp) 3 Stat 305 (Engineering Statistics) 3 ME 231

  18. HYPower Hydraulic Power Supply Unit University of Saskatchewan -Mechanical Engineering Fluid Power and Controls

    E-print Network

    Saskatchewan, University of

    HYPower Hydraulic Power Supply Unit University of Saskatchewan - Mechanical Engineering ­ Fluid Power and Controls ID: FP0002 Rev: 002 Date: May 31, 2010 Page: 1 of 7 Hydraulic Power Supply (HYPower-5462 Secondary Contact: #12;HYPower Hydraulic Power Supply Unit University of Saskatchewan - Mechanical

  19. East Hydraulic Power Supply Unit University of Saskatchewan -Mechanical Engineering Fluid Power and Controls

    E-print Network

    Saskatchewan, University of

    East Hydraulic Power Supply Unit University of Saskatchewan - Mechanical Engineering ­ Fluid Power and Controls ID: FP0004 Rev: 001 Date: May 31, 2010 Page: 1 of 7 East Hydraulic Power Supply and Test Bench. Approved By: Primary Contact: Doug Bitner Rm: 1B15.1 966-5462 Secondary Contact: #12;East Hydraulic Power

  20. The effect of humidity on engine power at altitude

    NASA Technical Reports Server (NTRS)

    Brooks, D G; Garlock, E A

    1933-01-01

    From tests made in the altitude chamber of the Bureau of Standards, it was found that the effect of humidity on engine power is the same at altitudes up to 25,000 feet as at sea level. Earlier tests on automotive engines, made under sea-level conditions, showed that water vapor acts as an inert diluent, reducing engine power in proportion to the amount of vapor present. By combining the effects of atmospheric pressure, temperature, and humidity, it is shown that the indicated power obtainable from an engine is proportional to its mass rate of consumption of oxygen. This has led the National Advisory Committee for Aeronautics to adopt a standard basis for the correction of engine performance, in which the effect of humidity is included.

  1. The Power of Aircraft Engines at Altitude

    NASA Technical Reports Server (NTRS)

    Ragazzi, Paolo

    1939-01-01

    The subject of the present paper is confined to the investigations and methods employed by the Fiat company in their studies on the altitude performance of an air-cooled engine of the production type. The experimental set-up as well as test engine data are provided.

  2. Initial Tests of a Thermoacoustic Space Power Engine

    NASA Astrophysics Data System (ADS)

    Backhaus, Scott

    2003-01-01

    Future NASA deep-space missions will require radioisotope-powered electric generators that are just as reliable as current RTGs, but more efficient and of higher specific power (W/kg). Thermoacoustic engines at the ~1-kW scale have converted high-temperature heat into acoustic, or PV, power without moving parts at 30% efficiency. Consisting of only tubes and a few heat exchangers, thermoacoustic engines are low mass and promise to be highly reliable. Coupling a thermoacoustic engine to a low mass, highly reliable and efficient linear alternator will create a heat-driven electric generator suitable for deep-space applications. Conversion efficiency data will be presented on a demonstration thermoacoustic engine designed for the 100-Watt power range.

  3. A Web MetaSearch Engine Using a Ranking Algorithm Based on a Markov Model

    E-print Network

    A Web Meta­Search Engine Using a Ranking Algorithm Based on a Markov Model Submitted to Committee .............................................................................................. 9 2.1 Current Web search services ............................................................................................................... 40 3.5.2 The spider

  4. The base engine for solar Stirling power

    NASA Astrophysics Data System (ADS)

    Meijer, R. J.; Godett, T. M.

    1984-03-01

    A new concept in Stirling engine technology is embodied in the base engine now being developed at Stirling Thermal Motors, Inc. This is a versatile energy conversion unit suitable for many different applications and heat sources. The base engine, rated 40 kW at 2800 RPM, is a four-cylinder, double-acting variable displacement Stirling engine with pressurized crankcase and rotating shaft seal. Remote-heating technology is incorporated with a stacked-heat-exchanger configuration and a liquid metal heat pipe connected to a distinctly separate combustor or other heat source. High efficiency over a wide range of operating conditions, long life, low manufacturing cost and low material cost are specifically emphasized. The base engine, its design philosophy and approach, its projected performance, and some of its more attractive applications are described.

  5. Base engine for solar Stirling power

    SciTech Connect

    Meijer, R.J.; Godett, T.M.

    1984-03-01

    A new concept in Stirling engine technology is embodied in the base engine now being developed at Stirling Thermal Motors, Inc. This is a versatile energy conversion unit suitable for many different applications and heat sources. The base engine, rated 40 kW at 2800 RPM, is a four-cylinder, double-acting variable displacement Stirling engine with pressurized crankcase and rotating shaft seal. Remote-heating technology is incorporated with a stacked-heat-exchanger configuration and a liquid metal heat pipe connected to a distinctly separate combustor or other heat source. High efficiency over a wide range of operating conditions, long life, low manufacturing cost and low material cost are specifically emphasized. The base engine, its design philosophy and approach, its projected performance, and some of its more attractive applications are described.

  6. The Base Engine for Solar Stirling Power

    NASA Technical Reports Server (NTRS)

    Meijer, R. J.; Godett, T. M.

    1984-01-01

    A new concept in Stirling engine technology is embodied in the base engine now being developed at Stirling Thermal Motors, Inc. This is a versatile energy conversion unit suitable for many different applications and heat sources. The base engine, rated 40 kW at 2800 RPM, is a four-cylinder, double-acting variable displacement Stirling engine with pressurized crankcase and rotating shaft seal. Remote-heating technology is incorporated with a stacked-heat-exchanger configuration and a liquid metal heat pipe connected to a distinctly separate combustor or other heat source. High efficiency over a wide range of operating conditions, long life, low manufacturing cost and low material cost are specifically emphasized. The base engine, its design philosophy and approach, its projected performance, and some of its more attractive applications are described.

  7. OPTIMIZATION OF A 2STROKE HCCI ENGINE POWER GENERATING SYSTEM

    Microsoft Academic Search

    Anne Marie Lewis; Srinath Gopinath; Kyoung Hyun Kwak

    In this project a power generating system comprising of a two-stroke Homogeneous Charge Compression Ignition (HCCI) engine with an alternator was analyzed and optimized using GT- Power and iSIGHT. The system was divided into three sub-systems viz. optimizing fuel economy, alternator efficiency and engine breathing. Objectives for each of the sub-system were arrived at after studying the design methodology of

  8. Advanced catalytic converter system for natural gas powered diesel engines

    Microsoft Academic Search

    Vadim O. Strots; Grigorii A. Bunimovich; Yurii Sh. Matros; Ming Zheng; Edward A. Mirosh

    1998-01-01

    The paper discusses the development of catalytic converter for aftertreatment of exhaust gas from diesel engines powered with natural gas. The converter, operated with periodical reversals of the flow, ensures destruction of CO and hydrocarbons, including methane. Both computer simulation and engine testing results are presented.

  9. Heat engine development for solar thermal power systems

    NASA Technical Reports Server (NTRS)

    Pham, H. Q.; Jaffe, L. D.

    1981-01-01

    The technical status of three heat engines (Stirling, high-temperature Brayton, and Combined cycle) for use in solar thermal power systems is presented. Performance goals necessary to develop a system competitive with conventional power requirements include an external heated engine output less than 40 kW, and efficiency power conversion subsystem at least 40% at rated output, and a half-power efficiency of at least 37%. Results show that the Stirling engine can offer a 39% efficiency with 100 hours of life, and a 20% efficiency with 10,000 hours of life, but problems with seals and heater heads exist. With a demonstrated efficiency near 31% at 1500 F and a minimum lifetime of 100,000 hours, the Brayton engine does not offer sufficient engine lifetime, efficiency, and maintenance for solar thermal power systems. Examination of the Rankine bottoming cycle of the Combined cycle engine reveals a 30 year lifetime, but a low efficiency. Additional development of engines for solar use is primarily in the areas of components to provide a long lifetime, high reliability, and low maintenance (no more than $0.001/kW-hr).

  10. Matroid Matching: the Power of Local Search [Extended Abstract

    E-print Network

    Vondrak, Jan

    Matroid Matching: the Power of Local Search [Extended Abstract] Jon Lee IBM Research Yorktown Vondrák IBM Research San Jose, CA jvondrak@us.ibm.com ABSTRACT We consider the classical matroid matching problem. Un- weighted matroid matching for linear matroids was solved by Lov´asz, and the problem is known

  11. OrChem - An open source chemistry search engine for Oracle®

    PubMed Central

    2009-01-01

    Background Registration, indexing and searching of chemical structures in relational databases is one of the core areas of cheminformatics. However, little detail has been published on the inner workings of search engines and their development has been mostly closed-source. We decided to develop an open source chemistry extension for Oracle, the de facto database platform in the commercial world. Results Here we present OrChem, an extension for the Oracle 11G database that adds registration and indexing of chemical structures to support fast substructure and similarity searching. The cheminformatics functionality is provided by the Chemistry Development Kit. OrChem provides similarity searching with response times in the order of seconds for databases with millions of compounds, depending on a given similarity cut-off. For substructure searching, it can make use of multiple processor cores on today's powerful database servers to provide fast response times in equally large data sets. Availability OrChem is free software and can be redistributed and/or modified under the terms of the GNU Lesser General Public License as published by the Free Software Foundation. All software is available via http://orchem.sourceforge.net. PMID:20298521

  12. Engineering research for tethered solar power satellite

    Microsoft Academic Search

    S. Sasaki; K. Tanaka; K. Higuchi; N. Okuizumi

    2004-01-01

    A solar power system, in which a flat panel of the size of 2 km by 1.9 km with a capability of power generation and transmission is suspended by multi-wires connected to a bus system 10 km upward, is proposed as an innovative solar power satellite (SPS) of 1 GW class. This SPS concept is highly robust and potentially low

  13. Engineering innovation to reduce wind power COE

    Microsoft Academic Search

    Ammerman; Curtt Nelson

    2011-01-01

    There are enough wind resources in the US to provide 10 times the electric power we currently use, however wind power only accounts for 2% of our total electricity production. One of the main limitations to wind use is cost. Wind power currently costs 5-to-8 cents per kilowatt-hour, which is more than twice the cost of electricity generated by burning

  14. WISE: a content-based Web image search engine

    NASA Astrophysics Data System (ADS)

    Qiu, Guoping; Palmer, R. D.

    2000-12-01

    This paper describes the development of a prototype of a Web Image Search Engine (WISE), which allows users to search for images on the WWW by image examples, in a similar fashion to current search engines that allow users to find related Web pages using text matching on keywords. The system takes an image specified by the user and finds similar images available on the WWW by comparing the image contents using low level image features. The current version of the WISE system consists of a graphical user interface (GUI), an autonomous Web agent, an image comparison program and a query processing program. The users specify the URL of a target image and the URL of the starting Web page from where the program will 'crawl' the Web, finding images along the way and retrieve those satisfying a certain constraints. The program then computes the visual features of the retrieved images and performs content-based comparison with the target image. The results of the comparison are then sorted according to a certain similarity measure, which along with thumbnails and information associated with the images, such as the URLs; image size, etc. are then written to an HTML page. The resultant page is stored on a Web server and is outputted onto the user's Web browser once the search process is complete. A unique feature of the current version of WISE is its image content comparison algorithm. It is based on the comparison of image palettes and it therefore very efficient in retrieving one of the two universally accepted image formats on the Web, 'gif.' In gif images, the color palette is contained in its header and therefore it is only necessary to retrieve the header information rather than the whole images, thus making it very efficient.

  15. Towards more power efficient IP lookup engines 

    E-print Network

    Ahmad, Seraj

    2007-04-25

    , which limits the throughput considerably. On the other hand, IP lookup throughput requirements have been continuously increasing. This has led to ternary content addressable memory(TCAM) based IP lookup engines which can perform a single lookup every...

  16. Search engine processor: Filtering and organizing peptide spectrum matches.

    PubMed

    Carvalho, Paulo C; Fischer, Juliana S G; Xu, Tao; Cociorva, Daniel; Balbuena, Tiago S; Valente, Richard H; Perales, Jonas; Yates, John R; Barbosa, Valmir C

    2012-04-01

    The search engine processor (SEPro) is a tool for filtering, organizing, sharing, and displaying peptide spectrum matches. It employs a novel three-tier Bayesian approach that uses layers of spectrum, peptide, and protein logic to lead the data to converge to a single list of reliable protein identifications. SEPro is integrated into the PatternLab for proteomics environment, where an arsenal of tools for analyzing shotgun proteomic data is provided. By using the semi-labeled decoy approach for benchmarking, we show that SEPro significantly outperforms a commercially available competitor. PMID:22311825

  17. ENGINEERING EVALUATION STUDIES HEAVY WATER MODERATED POWER REACTOR PLANTS

    Microsoft Academic Search

    W. A. Chittenden; G. F. Hoveke

    1961-01-01

    Engineering evaluation studies focused on heavy water moderated power ; reactor technology are discussed. Stainless steel, carbon steel, and Zircaloy-2 ; corrosion data are presented. Water treatment and corrosion product deposition ; are described. A study aimed at evaluating the effect of incorporating alternate ; low cost materials into a full-scale boiling DâO direct cycle power reactor ; plant was

  18. Cost engineering of power plants with alkaline fuel cells

    Microsoft Academic Search

    Olle Lindstrom; William Lavers

    1997-01-01

    The fuel cell is the most efficient device for direct conversion of hydrogen energy to electricity. The technology is here in the form of state of the art ammonia processes and the alkaline fuel cell (AFC), the reliable power source in the Apollo spacecrafts and the space shuttles. Cost engineering analysis of ammonia plants converted to terrestrial AFC power plants

  19. Application of virtual instrumentation in a power engineering laboratory

    Microsoft Academic Search

    Qamar H. Arsalan; Amanda Filbeck; Thomas W. Gedra

    2002-01-01

    This paper presents a few of the OSU-Stillwater Power Engineering Laboratory capabilities. Digital signal acquisition and virtual instrumentation (National Instruments' LABVIEW software) are used to help students understand the concepts by visualizing the data. Some features of virtual instrumentation are real-time display of waveforms, phasor diagrams, real and reactive power, spectral analysis as well as the ability to interpret the

  20. Virage image search engine: an open framework for image management

    NASA Astrophysics Data System (ADS)

    Bach, Jeffrey R.; Fuller, Charles; Gupta, Amarnath; Hampapur, Arun; Horowitz, Bradley; Humphrey, Rich; Jain, Ramesh C.; Shu, Chiao-Fe

    1996-03-01

    Until recently, the management of large image databases has relied exclusively on manually entered alphanumeric annotations. Systems are beginning to emerge in both the research and commercial sectors based on 'content-based' image retrieval, a technique which explicitly manages image assets by directly representing their visual attributes. The Virage image search engine provides an open framework for building such systems. The Virage engine expresses visual features as image 'primitives.' Primitives can be very general (such as color, shape, or texture) or quite domain specific (face recognition, cancer cell detection, etc.). The basic philosophy underlying this architecture is a transformation from the data-rich representation of explicit image pixels to a compact, semantic-rich representation of visually salient characteristics. In practice, the design of such primitives is non-trivial, and is driven by a number of conflicting real-world constraints (e.g. computation time vs. accuracy). The virage engine provides an open framework for developers to 'plug-in' primitives to solve specific image management problems. The architecture has been designed to support both static images and video in a unified paradigm. The infrastructure provided by the Virage engine can be utilized to address high-level problems as well, such as automatic, unsupervised keyword assignment, or image classification.

  1. The Gaze of the Perfect Search Engine: Google as an Infrastructure of Dataveillance

    NASA Astrophysics Data System (ADS)

    Zimmer, M.

    Web search engines have emerged as a ubiquitous and vital tool for the successful navigation of the growing online informational sphere. The goal of the world's largest search engine, Google, is to "organize the world's information and make it universally accessible and useful" and to create the "perfect search engine" that provides only intuitive, personalized, and relevant results. While intended to enhance intellectual mobility in the online sphere, this chapter reveals that the quest for the perfect search engine requires the widespread monitoring and aggregation of a users' online personal and intellectual activities, threatening the values the perfect search engines were designed to sustain. It argues that these search-based infrastructures of dataveillance contribute to a rapidly emerging "soft cage" of everyday digital surveillance, where they, like other dataveillance technologies before them, contribute to the curtailing of individual freedom, affect users' sense of self, and present issues of deep discrimination and social justice.

  2. Searching the Internet Part I: Some Basic Considerations and Automated Search Indexes

    NSDL National Science Digital Library

    Solock, Jack.

    This guide to finding resources on the Internet describes the many Web search engines available, their respective powers and disadvantages, and gives advice to users hoping to use the search engines effectively.

  3. Transporting submarine engines to power the PRT

    NASA Technical Reports Server (NTRS)

    1926-01-01

    Inside the test section of the PRT. Laid out on the floor are the myriad parts needed for the final assembly of the diesel engines. In the back right corner are scales that would be used in the tunnel's balance. The dolly near the door under the entrance cone is for an oxy-acetelyne welding apparatus.

  4. Mechatronics-a powerful concurrent engineering framework

    Microsoft Academic Search

    Hendrik M. J. Van Brussel

    1996-01-01

    Mechatronics is emerging as a concurrent-engineering thinking framework in the process of designing complex machines. It is argued that mechatronics can be defined as the science of motion control. The different steps in the evolution from smart machines to intelligent autonomous systems are discussed and illustrated with many examples, mainly taken from the author's research experience.

  5. An ontology-based search engine for protein-protein interactions

    PubMed Central

    2010-01-01

    Background Keyword matching or ID matching is the most common searching method in a large database of protein-protein interactions. They are purely syntactic methods, and retrieve the records in the database that contain a keyword or ID specified in a query. Such syntactic search methods often retrieve too few search results or no results despite many potential matches present in the database. Results We have developed a new method for representing protein-protein interactions and the Gene Ontology (GO) using modified Gödel numbers. This representation is hidden from users but enables a search engine using the representation to efficiently search protein-protein interactions in a biologically meaningful way. Given a query protein with optional search conditions expressed in one or more GO terms, the search engine finds all the interaction partners of the query protein by unique prime factorization of the modified Gödel numbers representing the query protein and the search conditions. Conclusion Representing the biological relations of proteins and their GO annotations by modified Gödel numbers makes a search engine efficiently find all protein-protein interactions by prime factorization of the numbers. Keyword matching or ID matching search methods often miss the interactions involving a protein that has no explicit annotations matching the search condition, but our search engine retrieves such interactions as well if they satisfy the search condition with a more specific term in the ontology. PMID:20122195

  6. Evaluation of proteomic search engines for the analysis of histone modifications.

    PubMed

    Yuan, Zuo-Fei; Lin, Shu; Molden, Rosalynn C; Garcia, Benjamin A

    2014-10-01

    Identification of histone post-translational modifications (PTMs) is challenging for proteomics search engines. Including many histone PTMs in one search increases the number of candidate peptides dramatically, leading to low search speed and fewer identified spectra. To evaluate database search engines on identifying histone PTMs, we present a method in which one kind of modification is searched each time, for example, unmodified, individually modified, and multimodified, each search result is filtered with false discovery rate less than 1%, and the identifications of multiple search engines are combined to obtain confident results. We apply this method for eight search engines on histone data sets. We find that two search engines, pFind and Mascot, identify most of the confident results at a reasonable speed, so we recommend using them to identify histone modifications. During the evaluation, we also find some important aspects for the analysis of histone modifications. Our evaluation of different search engines on identifying histone modifications will hopefully help those who are hoping to enter the histone proteomics field. The mass spectrometry proteomics data have been deposited to the ProteomeXchange Consortium with the data set identifier PXD001118. PMID:25167464

  7. Search Engine : a Synthesis, Innovation & Regulation Chair, Workshop, 16 Mai 2008

    Microsoft Academic Search

    Pierre-Jean Benghozi

    2008-01-01

    In a digital economy which is increasingly becoming an information and attention-based economy, search engines are occupying a central role shaped by the symbolic status of Google both in terms of its renown and its dominance of internet traffic. Despite their importance, economic models and competition structures for search engines are not widely understood. Thanks to their top-heavy IT infrastructures,

  8. FUSION METHODS BASED ON COMMON ORDER INVARIABILITY FOR META SEARCH ENGINE SYSTEMS

    E-print Network

    Zhang, Minjie

    FUSION METHODS BASED ON COMMON ORDER INVARIABILITY FOR META SEARCH ENGINE SYSTEMS Xiaohua Yang Hui@ctit.zhnut.edu.cn hy92,minjie@uow.edu.au Abstract: Fusion is an important work for running meta search engine systems. A fusion algorithm is rational iff it can satisfy three conditions, i.e. the associativity, commutativity

  9. Index Compression and Efficient Query Processing in Large Web Search Engines

    ERIC Educational Resources Information Center

    Ding, Shuai

    2013-01-01

    The inverted index is the main data structure used by all the major search engines. Search engines build an inverted index on their collection to speed up query processing. As the size of the web grows, the length of the inverted list structures, which can easily grow to hundreds of MBs or even GBs for common terms (roughly linear in the size of…

  10. RISE: A Robust Image Search Engine Debangshu Goswami & Sanjiv K. Bhatia

    E-print Network

    He, Wenjie

    drawback is that many applications, such as weather forecasting or law enforcement, involve a significant to create tokens to satisfy each possible query. At the present time, the technology has not advanced. The matching process is achieved by a search engine. This paper advances Robust Image Search Engine (RISE

  11. The Human Flesh Search Engine: Democracy, Censorship, and Political Participation in Twenty-First Century China

    Microsoft Academic Search

    Vincent Capone

    2012-01-01

    The Human Flesh Search Engine is a recent, unique phenomenon on the Chinese internet. Comprising of thousands of forum, micro-blog, and entertainment websites and mobilizing the overwhelming number of Chinese internet users, or netizens, the search engine is able to quickly find obscure information and identify seemingly anonymous internet personalities. These websites allow netizens to have their voices heard in

  12. The Value of Interdisciplinarity: A Study Based on the Design of Internet Search Engines.

    ERIC Educational Resources Information Center

    Herring, Susan Davis

    1999-01-01

    Examines whether search engine design shows a pattern of interdisciplinarity focusing on two disciplines: computer science and library/information science. A citation analysis measured levels of interdisciplinary research and publishing in search engine design and development. Results show a higher level of interdisciplinarity among library and…

  13. MSTAR's extensible search engine and model-based inferencing toolkit

    NASA Astrophysics Data System (ADS)

    Wissinger, John; Ristroph, Robert; Diemunsch, Joseph R.; Severson, William E.; Fruedenthal, Eric

    1999-08-01

    The DARPA/AFRL 'Moving and Stationary Target Acquisition and Recognition' (MSTAR) program is developing a model-based vision approach to Synthetic Aperture Radar (SAR) Automatic Target Recognition (ATR). The motivation for this work is to develop a high performance ATR capability that can identify ground targets in highly unconstrained imaging scenarios that include variable image acquisition geometry, arbitrary target pose and configuration state, differences in target deployment situation, and strong intra-class variations. The MSTAR approach utilizes radar scattering models in an on-line hypothesize-and-test operation that compares predicted target signature statistics with features extracted from image data in an attempt to determine a 'best fit' explanation of the observed image. Central to this processing paradigm is the Search algorithm, which provides intelligent control in selecting features to measure and hypotheses to test, as well as in making the decision about when to stop processing and report a specific target type or clutter. Intelligent management of computation performed by the Search module is a key enabler to scaling the model-based approach to the large hypothesis spaces typical of realistic ATR problems. In this paper, we describe the present state of design and implementation of the MSTAR Search engine, as it has matured over the last three years of the MSTAR program. The evolution has been driven by a continually expanding problem domain that now includes 30 target types, viewed under arbitrary squint/depression, with articulations, reconfigurations, revetments, variable background, and up to 30% blocking occlusion. We believe that the research directions that have been inspired by MSTAR's challenging problem domain are leading to broadly applicable search methodologies that are relevant to computer vision systems in many areas.

  14. An Approach in Building a Chemical Compound Search Engine in Oracle Database

    Microsoft Academic Search

    H. Wang; P. Volarath; R. Harrison

    2005-01-01

    A searching or identifying of chemical compounds is an important process in drug design and in chemistry research. An efficient search engine involves a close coupling of the search algorithm and database implementation. The database must process chemical structures, which demands the approaches to represent, store, and retrieve structures in a database system. In this paper, a general database framework

  15. 3. ELEVATIONS, ADDITION TO POWER HOUSE. United Engineering Company Ltd., ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. ELEVATIONS, ADDITION TO POWER HOUSE. United Engineering Company Ltd., Alameda Shipyard. John Hudspeth, architect, foot of Main Street, Alameda, California. Sheet 4. Plan no. 10,548. Scale 1/4 inch to the foot, elevations, and one inch to the foot, sections and details. April 30, 1945, last revised 6/19/45. pencil on vellum - United Engineering Company Shipyard, Boiler House, 2900 Main Street, Alameda, Alameda County, CA

  16. Magnetohydrodynamic (MHD) power plant interface engineering

    Microsoft Academic Search

    L. E. Van Bibber; D. A. Wiseman; J. W. Cuchens

    1990-01-01

    This report summarizes the results of EPRI Research Project 2466-10. The objective of this project was to identify the preliminary interface requirements and characteristics for a coal-fired magnetohydrodynamic retrofit power plant located at the Scholz Generating Station, Sneads, Florida. An initial building arrangement has been developed and incorporated into the plot plan of the Scholz Generating Station. An MHD process

  17. Application of the subatmospheric engine to solar thermal power

    NASA Technical Reports Server (NTRS)

    1982-01-01

    The development of a natural gas-fired Brayton engine is discussed. It is intended to be the prime mover for a 10-ton commercial heat pump. This engine has many attractive features that make it an ideal candidate for solar thermal-power generation applications. The unique feature of this engine is its subatmospheric mode of operation. It operates between atmospheric pressure and a partial vacuum. This means that heat is added to the cycle at atmospheric pressure; this permits the receiver to be unpressurized, greatly simplifying its design and cost.

  18. Dynamic clinical data mining: search engine-based decision support.

    PubMed

    Celi, Leo Anthony; Zimolzak, Andrew J; Stone, David J

    2014-01-01

    The research world is undergoing a transformation into one in which data, on massive levels, is freely shared. In the clinical world, the capture of data on a consistent basis has only recently begun. We propose an operational vision for a digitally based care system that incorporates data-based clinical decision making. The system would aggregate individual patient electronic medical data in the course of care; query a universal, de-identified clinical database using modified search engine technology in real time; identify prior cases of sufficient similarity as to be instructive to the case at hand; and populate the individual patient's electronic medical record with pertinent decision support material such as suggested interventions and prognosis, based on prior outcomes. Every individual's course, including subsequent outcomes, would then further populate the population database to create a feedback loop to benefit the care of future patients. PMID:25600664

  19. Dynamic Clinical Data Mining: Search Engine-Based Decision Support

    PubMed Central

    Zimolzak, Andrew J; Stone, David J

    2014-01-01

    The research world is undergoing a transformation into one in which data, on massive levels, is freely shared. In the clinical world, the capture of data on a consistent basis has only recently begun. We propose an operational vision for a digitally based care system that incorporates data-based clinical decision making. The system would aggregate individual patient electronic medical data in the course of care; query a universal, de-identified clinical database using modified search engine technology in real time; identify prior cases of sufficient similarity as to be instructive to the case at hand; and populate the individual patient's electronic medical record with pertinent decision support material such as suggested interventions and prognosis, based on prior outcomes. Every individual's course, including subsequent outcomes, would then further populate the population database to create a feedback loop to benefit the care of future patients. PMID:25600664

  20. 14 CFR 33.96 - Engine tests in auxiliary power unit (APU) mode.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...2010-01-01 false Engine tests in auxiliary power unit (APU) mode. 33.96...Engines § 33.96 Engine tests in auxiliary power unit (APU) mode. If the...stopped during operation of the engine as an auxiliary power unit (“APU mode”), in...

  1. Low-Power Microwave Electron Source for Ion Engine Neutralizer

    Microsoft Academic Search

    Ikkoh Funaki; Shin Satori; Hitoshi Kuninaka

    1998-01-01

    Operation of an ion engine in space requires an electron source to maintain the spacecraft's electrical neutrality. To neutralize exhausted ions, a low-power, compact microwave electron source was developed. An 18-mm-diameter noncavity-type discharge chamber consisting of an L-shaped antenna and a magnetic circuit was developed, and electron emission current of 100 mA was obtained at the power level of 10

  2. Using Internet Search Engines to Obtain Medical Information: A Comparative Study

    PubMed Central

    Wang, Liupu; Wang, Juexin; Wang, Michael; Li, Yong; Liang, Yanchun

    2012-01-01

    Background The Internet has become one of the most important means to obtain health and medical information. It is often the first step in checking for basic information about a disease and its treatment. The search results are often useful to general users. Various search engines such as Google, Yahoo!, Bing, and Ask.com can play an important role in obtaining medical information for both medical professionals and lay people. However, the usability and effectiveness of various search engines for medical information have not been comprehensively compared and evaluated. Objective To compare major Internet search engines in their usability of obtaining medical and health information. Methods We applied usability testing as a software engineering technique and a standard industry practice to compare the four major search engines (Google, Yahoo!, Bing, and Ask.com) in obtaining health and medical information. For this purpose, we searched the keyword breast cancer in Google, Yahoo!, Bing, and Ask.com and saved the results of the top 200 links from each search engine. We combined nonredundant links from the four search engines and gave them to volunteer users in an alphabetical order. The volunteer users evaluated the websites and scored each website from 0 to 10 (lowest to highest) based on the usefulness of the content relevant to breast cancer. A medical expert identified six well-known websites related to breast cancer in advance as standards. We also used five keywords associated with breast cancer defined in the latest release of Systematized Nomenclature of Medicine-Clinical Terms (SNOMED CT) and analyzed their occurrence in the websites. Results Each search engine provided rich information related to breast cancer in the search results. All six standard websites were among the top 30 in search results of all four search engines. Google had the best search validity (in terms of whether a website could be opened), followed by Bing, Ask.com, and Yahoo!. The search results highly overlapped between the search engines, and the overlap between any two search engines was about half or more. On the other hand, each search engine emphasized various types of content differently. In terms of user satisfaction analysis, volunteer users scored Bing the highest for its usefulness, followed by Yahoo!, Google, and Ask.com. Conclusions Google, Yahoo!, Bing, and Ask.com are by and large effective search engines for helping lay users get health and medical information. Nevertheless, the current ranking methods have some pitfalls and there is room for improvement to help users get more accurate and useful information. We suggest that search engine users explore multiple search engines to search different types of health information and medical knowledge for their own needs and get a professional consultation if necessary. PMID:22672889

  3. Improving turbocharged diesel engine operation with turbo power assist system

    Microsoft Academic Search

    I. Kolmanovsky; A. G. Stefanopoulous; B. K. Powell

    1999-01-01

    The paper investigates improvements in the turbocharged diesel engine transient response that can be attained when a turbocharger power assist system, consisting, for example, of an electric motor and a battery, is coupled to the turbocharger shaft. The method of investigation relies on formulating and solving numerically an appropriate minimum time optimal control problem. Comparison with a conventional turbocharged diesel

  4. Undergraduate research and new laboratory practices in power engineering

    Microsoft Academic Search

    Efraín O'Neill-Carrillo; Tania Martínez-Navedo; José Ramos; Miguel Vélez-Reyes; Eddie Marrero

    2002-01-01

    A recent NSF Course, Curriculum and Laboratory Improvement (CCLI) grant supported the adaptation and creation of activities that connect power engineering theory to actual scaled-implementations at the University of Puerto Rico-Mayaguez (UPRM). To this end, laboratory practices and undergraduate research projects were conducted at the new Energy Systems Instrumentation Laboratory (ESIL). Activities at ESIL include: traditional laboratory practices; laboratory practices

  5. An approach in building a chemical compound search engine in oracle database.

    PubMed

    Wang, H; Volarath, P; Harrison, R

    2005-01-01

    A searching or identifying of chemical compounds is an important process in drug design and in chemistry research. An efficient search engine involves a close coupling of the search algorithm and database implementation. The database must process chemical structures, which demands the approaches to represent, store, and retrieve structures in a database system. In this paper, a general database framework for working as a chemical compound search engine in Oracle database is described. The framework is devoted to eliminate data type constrains for potential search algorithms, which is a crucial step toward building a domain specific query language on top of SQL. A search engine implementation based on the database framework is also demonstrated. The convenience of the implementation emphasizes the efficiency and simplicity of the framework. PMID:17282834

  6. Duke Engineering explores huge African Power Project

    SciTech Connect

    Newman, P.

    1994-10-14

    Duke Engineering & Services and the African Republic of Uganda have entered into a memorandum of understanding to explore the feasibility of installing one or more hydropower plants along the Nile River and building a 2,000 mile transmission line through southern Africa. The project`s participants say they envision a southern African electricity grid connecting all countries in the region. A team comprised of officials from DE&S, Edlow and SAD-ELEC will conduct a six-month, two-part study on the feasibility of linking the existing grid system in the region. The first part of the study will look at the feasibility of installing one or more independent hydropower plants along the Nile and other rivers in Uganda. The second part will explore the design, construction and operation of a transmission system to interconnect Uganda, through neighboring countries to the south and east, to the Republic of South Africa. The site for the proposed hydroelectric plant will determine the route of the transmission line.

  7. Internet Power Searching: The Advanced Manual. 2nd Edition. Neal-Schuman NetGuide Series.

    ERIC Educational Resources Information Center

    Bradley, Phil

    This handbook provides information on how Internet search engines and related software and utilities work and how to use them in order to improve search techniques. The book begins with an introduction to the Internet. Part 1 contains the following chapters that cover mining the Internet for information: "An Introduction to Search

  8. Bench wear testing of engine power cylinder components

    SciTech Connect

    Patterson, D.J. [Univ. of Michigan, Ann Arbor, MI (United States); Hill, S.H. [Sealed Power Technologies, Muskegon, MI (United States); Tung, S.C. [General Motors Research Labs., Warren, MI (United States)

    1993-02-01

    A need exists for an accurate and repeatable friction and wear bench test for engine power cylinder components that more closely relates to engine test results. Current research and development includes investigation of new engine designs, materials, coatings and surface treatments for reduced weight, longer life, higher operating temperature, and reduced friction. Alternative fuels being examined include alcohols and gaseous fuels, as well as reformulated gasolines and distillate fuels. Concurrently, new lubricants are being formulated for the new engine and fuel combinations. Because of the enormous cost and time of developing commercial engine, fuel and lubricant combinations by means of engine testing alone, much interest is being focused on more representative and repeatable bench tests. This paper examines some known bench testers employing either rotary or reciprocating motion for evaluating the friction, wear, and durability of material couples. Information is presented on experience and practice with one rotary (Falex type) and two reciprocating testers (Cameron-Plint and a new design, the EMA-L59). Some correlation with engine data is given.

  9. Defining benefits and potential techniques for power measuring computers and meters on engine powered vehicles

    SciTech Connect

    Wicks, F. [Union College, Schenectady, NY (United States). Mechanical Engineering Dept.

    1995-12-31

    Because of lack of instrumentation, drivers of engine driven vehicles have virtually no idea how much power is being converted and lost in the series of energy conversion processes between the gasoline tank and the road, whereas a driver of an electric vehicle can have a somewhat better understanding of the power produced, converted and consumed. The fundamental reason is that electric power is the product of current, which is easy to measure, and voltage which is also easy to measure, whereas mechanical power is the product of rotational or linear speed and torque or a linear force. While speed is readily measurable, torque and force is generally difficult to measure in other than laboratory conditions. If this force or torque were to be measured it would also require computer based processing for meaningful display and energy performance monitoring. Thus, this paper will define some potential techniques and benefits for power and performance instrumentation for the next generations of engine driven cars.

  10. Systems Engineering for the Kepler Mission: A Search for Terrestrial Planets

    E-print Network

    Rhoads, James

    Systems Engineering for the Kepler Mission: A Search for Terrestrial Planets Riley Duren*a , Karen, extra-solar planets, Kepler mission, validation & verification, performance modeling * riley.m.duren

  11. Apply Feedback Control Theory to Design Soft Real-Time Search Engine System

    Microsoft Academic Search

    Huayong Wang; Yiqi Dai

    2004-01-01

    \\u000a This paper proposes a design method for soft real-time search engine system, and provides proofs to its correctness and robustness\\u000a both in control theory and by practical experiments. An analyzable mathematical model is set up to approximately describe\\u000a the nonlinear and time-varying search engine system. The feedback control theory is adopted to prove the system’s stableness,\\u000a zero steady state error

  12. Fusion Engineering and Design 82 (2007) 217236 Advanced power core system for the

    E-print Network

    California at San Diego, University of

    2007-01-01

    Fusion Engineering and Design 82 (2007) 217­236 Advanced power core system for the ARIES-AT power of Wisconsin, Fusion Technology Institute, 1500 Engineering Drive, Madison, WI 53706-1687, USA c Engineering and Design 82 (2007) 217­236 ties on the performance of advanced tokamak power plants [1

  13. Department of Engineering Science and Mechanics Spring 2013 Solar Powered Well Pump

    E-print Network

    Demirel, Melik C.

    PENNSTATE Department of Engineering Science and Mechanics Spring 2013 Solar Powered Well Pump systems and steam engines were not viable options the team decided that a solar powered heat engine and achieving the power and flow specifications within the team's budget. Objectives The team set 3 tiers

  14. A Search Engine for Handwritten Documents Sargur Srihari, Chen Huang, Harish Srinivasan

    E-print Network

    search engine on handwritten documents is described. Documents are indexed using global image features, e. Image indexing is done automatically using page analysis, page segmentation, line separation, word on the functional capabilities of the various search techniques and their performance. 1. INTRODUCTION The need

  15. 3D-Model Search Engine from Photos Tarik Filali Ansary

    E-print Network

    Vandeborre, Jean-Philippe

    3D-Model Search Engine from Photos Tarik Filali Ansary LIFL UMR CNRS/USTL 8022 Univ. Lille 1 Univ. Lille 1 ­ France daoudi@lifl.fr ABSTRACT In this paper, we present the FOX-MIIRE 3D-Model Search uses statisti- cal model distribution scores to select the optimal number of views to characterise a 3D

  16. Chinese Error Correction of Searching Engine under N-Gram Statistic Model

    Microsoft Academic Search

    Gang Liu; Zhipeng Chen

    2010-01-01

    In Chinese language the key words error correction in searching engine is an important assisting function in improving the search efficiency. An information statistical method completely through analyzing the context is put forward. According to the features of Chinese language, based on the establishment of N-gram Statistics Model, analysis and comparison, through calculating the weightiness of TF\\/IDF, the optimized error

  17. Design and Implementation-Algorithms of Amharic Search Engine System for Amharic Web Contents

    Microsoft Academic Search

    Hassen Redwan; Solomon Atnafu

    2009-01-01

    On the Web, the use of languages other than English (e.g., Amharic language) has been growing exponentially. The number of Web documents in Amharic language as well as Internet users in Ethiopia is growing dramatically. However, the major search engines have been lagging behind in providing indexes, stemming and search features to handle this language. Therefore, the design and implementation

  18. Optimization of Federated Multimedia Queries in an External Meta-search Engine

    E-print Network

    Hammerton, James

    Optimization of Federated Multimedia Queries in an External Meta-search Engine Florian Stegmaier processing strategies as well as a multimedia caching system. Keywords External meta-search, federated, a crucial task in such retrieval environments is query optimization in federated and distributed retrieval

  19. A Tree Based Router Search Engine Architecture With Single Port Memories

    E-print Network

    A Tree Based Router Search Engine Architecture With Single Port Memories Florin Baboescu , Dean M routers to meet speed demands. Tree-based searches are pipelined across a number of stages to achieve high is the need to provide high packet forwarding rates through the router. This paper presents a novel

  20. Search Engine Driven Author Disambiguation Yee Fan Tan and Min-Yen Kan

    E-print Network

    Kan, Min-Yen

    ­ Information Search and Retrieval General Terms: Algorithms Keywords: Entity Resolution, Author DisambiguationSearch Engine Driven Author Disambiguation Yee Fan Tan and Min-Yen Kan Department of Computer Park, PA 16802 dongwon@psu.edu ABSTRACT In scholarly digital libraries, author disambiguation is an im

  1. A Meta Search Engine for User Adaptive Information Retrieval Interfaces for Desktop and Mobile Devices

    Microsoft Academic Search

    Ernesto William De Luca; Andreas Nürnberger

    2005-01-01

    In this paper we present an information retrieval system (meta search engine) that provides web service based methods for user and query specific annotation of search results. The system currently supports two types of annota- tions: Categorization based on information extracted from user bookmarks (In- telligent Bookmarks) and semantic disambiguation of query terms in docu- ments using an ontology that

  2. Combining Semantic Search and Ontology Learning for Incremental Web Ontology Engineering

    E-print Network

    Boyer, Edmond

    Combining Semantic Search and Ontology Learning for Incremental Web Ontology Engineering Nesrine {nesrine.benmustapha, hajer.baazaouizghal, henda.benghezala}@riadi.rnu.tn 2 Mas Laboratory, SAP Business that describe semantic Web search for ontology learning. In a previous work, we have proposed an incremental

  3. Seeds of Solutions(TM): An economical & efficient approach towards power engineering education

    NASA Astrophysics Data System (ADS)

    Alvarez, Eli

    Power demands are set to increase over the next twenty years; however, research shows that there may be a shortage of power engineers due to an appreciable percentage of the current power engineer workforce retiring, insufficient enrollment in power engineering programs and a lack of emphasis in power engineering at the university level. This thesis provides supporting research for future power demands, workforce and faculty shortages. Using temporary research in modern learning / teaching styles, student / teacher perceptions, educational trends and regional course offerings, this thesis describes a learning approach towards power engineering education. Designed specifically for universities with little to no power engineering course offerings and universities that wish to augment their existing approach, the approach incorporates an emphasis in fundamentals and engineering design making it economical and easy to implement. This thesis also includes three (3) video laboratory examples incorporating all elements of the approach.

  4. World Wide Web Search Engines: AltaVista and Yahoo.

    ERIC Educational Resources Information Center

    Machovec, George S., Ed.

    1996-01-01

    Examines the history, structure, and search capabilities of Internet search tools AltaVista and Yahoo. AltaVista provides relevance-ranked feedback on full-text searches. Yahoo indexes Web "citations" only but does organize information hierarchically into predefined categories. Yahoo has recently become a publicly held company and currently…

  5. Instruction Guide Shopping Using the Product Keyword Search

    E-print Network

    Pilyugin, Sergei S.

    and add them to your cart. The Product Search is a very powerful search engine. Start with by entering in the flyout menu. 3. To start searching for an item, enter the item in the search field. Include specific search terms, such as "latex-free gloves" instead of just "gloves". The system is flexible with search

  6. Instruction Guide Shopping Using the Product Keyword Search

    E-print Network

    Sheremet, Alexandru

    powerful search engine. Start with by entering an item into the search field and follow the steps outlined the Home/Shop tab at the top to start your search 3. To start searching for an item, enter the item in the search field ­ include specific search terms, such as "latex-free gloves" instead of just "gloves

  7. Focused Crawling Using Latent Semantic Indexing - An Application for Vertical Search Engines

    Microsoft Academic Search

    George Almpanidis; Constantine Kotropoulos; Ioannis Pitas

    2005-01-01

    Vertical search engines and web portals are gaining ground over the general-purpose engines due to their limited size and their high precision for the domain they cover. The number of vertical portals has rapidly increased over the last years, making the importance of a topic-driven (focused) crawler evident. In this paper, we develop a latent semantic indexing classier that combines

  8. Engineering design aspects of the heat-pipe power system

    SciTech Connect

    Capell, B.M.; Houts, M.G.; Poston, D.I.; Berte, M.

    1997-10-01

    The Heat-pipe Power System (HPS) is a near-term, low-cost space power system designed at Los Alamos that can provide up to 1,000 kWt for many space nuclear applications. The design of the reactor is simple, modular, and adaptable. The basic design allows for the use of a variety of power conversion systems and reactor materials (including the fuel, clad, and heat pipes). This paper describes a project that was undertaken to develop a database supporting many engineering aspects of the HPS design. The specific tasks discussed in this paper are: the development of an HPS materials database, the creation of finite element models that will allow a wide variety of investigations, and the verification of past calculations.

  9. Engineering design aspects of the heatpipe power system

    NASA Astrophysics Data System (ADS)

    Capell, Brent; Berte, Marc

    1998-01-01

    The Heatpipe Power System (HPS) is a near-term, low-cost space fission power system designed at Los Alamos National Laboratory that can provide up to 1000 kWt for many space applications. The design of the reactor is simple, modular, and adaptable. The basic design allows for the use of a variety of power conversion systems and reactor materials (including the fuel, clad, and heatpipes). This paper describes a project that was undertaken to develop a database supporting many engineering aspects of the HPS design. The specific tasks discussed in this paper are: the development of an HPS materials database, the creation of finite element models that will allow a wide variety of investigations, and the verification of past calculations.

  10. Engineering design aspects of the heatpipe power system

    SciTech Connect

    Capell, B. [University of Michigan, 810 Barton Dr., Ann Arbor, Michigan 48105 (United States); Berte, M. [Massachusetts Institute of Technology, 54 Pearl St. No. 1, Cambridge, Massachusetts 02139 (United States)

    1998-01-01

    The Heatpipe Power System (HPS) is a near-term, low-cost space fission power system designed at Los Alamos National Laboratory that can provide up to 1000 kWt for many space applications. The design of the reactor is simple, modular, and adaptable. The basic design allows for the use of a variety of power conversion systems and reactor materials (including the fuel, clad, and heatpipes). This paper describes a project that was undertaken to develop a database supporting many engineering aspects of the HPS design. The specific tasks discussed in this paper are: the development of an HPS materials database, the creation of finite element models that will allow a wide variety of investigations, and the verification of past calculations. {copyright} {ital 1998 American Institute of Physics.}

  11. Engineering design aspects of the heatpipe power system

    SciTech Connect

    Capell, Brent; Berte, Marc [University of Michigan, 810 Barton Dr., Ann Arbor, Michigan 48105 (United States); Massachusetts Institute of Technology, 54 Pearl St. 1, Cambridge, Massachusetts 02139 (United States)

    1998-01-15

    The Heatpipe Power System (HPS) is a near-term, low-cost space fission power system designed at Los Alamos National Laboratory that can provide up to 1000 kWt for many space applications. The design of the reactor is simple, modular, and adaptable. The basic design allows for the use of a variety of power conversion systems and reactor materials (including the fuel, clad, and heatpipes). This paper describes a project that was undertaken to develop a database supporting many engineering aspects of the HPS design. The specific tasks discussed in this paper are: the development of an HPS materials database, the creation of finite element models that will allow a wide variety of investigations, and the verification of past calculations.

  12. FOAMSearch.net: A custom search engine for emergency medicine and critical care.

    PubMed

    Raine, Todd; Thoma, Brent; Chan, Teresa M; Lin, Michelle

    2015-08-01

    The number of online resources read by and pertinent to clinicians has increased dramatically. However, most healthcare professionals still use mainstream search engines as their primary port of entry to the resources on the Internet. These search engines use algorithms that do not make it easy to find clinician-oriented resources. FOAMSearch, a custom search engine (CSE), was developed to find relevant, high-quality online resources for emergency medicine and critical care (EMCC) clinicians. Using Google(TM) algorithms, it searches a vetted list of >300 blogs, podcasts, wikis, knowledge translation tools, clinical decision support tools and medical journals. Utilisation has increased progressively to >3000 users/month since its launch in 2011. Further study of the role of CSEs to find medical resources is needed, and it might be possible to develop similar CSEs for other areas of medicine. PMID:25939364

  13. Research requirements for emergency power to permit hover-one-engine-inoperative helicopter operation

    NASA Technical Reports Server (NTRS)

    Yost, J. H.

    1976-01-01

    The research and technology demonstration requirements to achieve emergency-power capability for a civil helicopter are documented. The goal for emergency power is the ability to hover with one engine inoperative, transition to minimum-power forward flight, and continue to a safe landing where emergency power may or may not be required. The best method to obtain emergency power is to augment the basic engine power by increasing the engine's speed and turbine-inlet temperature, combined with water-alcohol injection at the engine inlet. Other methods, including turbine boost power and flywheel energy, offer potential for obtaining emergency power for minimum time durations. Costs and schedules are estimated for a research and development program to bring emergency power through a hardware-demonstration test. Interaction of engine emergency-power capability with other helicopter systems is examined.

  14. Study of a High Voltage Ion Engine Power Supply

    NASA Technical Reports Server (NTRS)

    Stuart, Thomas A.; King, Roger J.; Mayer, Eric

    1996-01-01

    A complete laboratory breadboard version of a ion engine power converter was built and tested. This prototype operated on a line voltage of 80-120 Vdc, and provided output ratings of 1100 V at 1.8 kW, and 250 V at 20 mA. The high-voltage (HV) output voltage rating was revised from the original value of 1350 V at the beginning of the project. The LV output was designed to hold up during a 1-A surge current lasting up to 1 second. The prototype power converter included a internal housekeeping power supply which also operated from the line input. The power consumed in housekeeping was included in the overall energy budget presented for the ion engine converter. HV and LV output voltage setpoints were commanded through potentiometers. The HV converter itself reached its highest power efficiency of slightly over 93% at low line and maximum output. This would dip below 90% at high line. The no-load (rated output voltages, zero load current) power consumption of the entire system was less than 13 W. A careful loss breakdown shows that converter losses are predominately Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET) conduction losses and HV rectifier snubbing losses, with the rectifier snubbing losses becoming predominant at high line. This suggests that further improvements in power efficiency could best be obtained by either developing a rectifier that was adequately protected against voltage overshoot with less snubbing, or by developing a pre-regulator to reduced the range of line voltage on the converter. The transient testing showed the converter to be fully protected against load faults, including a direct short-circuit from the HV output to the LV output terminals. Two currents sensors were used: one to directly detect any core ratcheting on the output transformer and re-initiate a soft start, and the other to directly detect a load fault and quickly shut down the converter for load protection. The finished converter has been extensively fault tested without failure. The finished converter has been packaged suitable for use as a laboratory prototype for further testing. The finished converter is readily transportable. An article on design issues for high voltage converters for ion engines is included as an attachement.

  15. Offshore Wind Power: Science, engineering, and policy MAST 628-010, Fall 2008

    E-print Network

    Firestone, Jeremy

    Offshore Wind Power: Science, engineering, and policy MAST 628-010, Fall 2008 Revised 10 October displaced from large coal and gas generators; · Storage of intermittent wind power; · Public opposition to, and support for, wind power; communication strategies. Students should

  16. Combinatorial search strategies for the metabolic engineering of microorganisms

    E-print Network

    Santos, Christine Nicole S. (Christine Nicole San Diego)

    2010-01-01

    Although the field of microbial metabolic engineering has traditionally been dominated by rational and knowledge-driven approaches, recent advances in genetic engineering have led to the emergence of a new methodology based ...

  17. Power optimization of an irreversible Brayton heat engine

    SciTech Connect

    Cheng, C.Y.; Chen, C.K. [National Cheng-Kung Univ., Tainan (Taiwan, Province of China). Dept. of Mechanical Engineering

    1997-06-01

    Brayton cycles have been used extensively in gas-turbine power plants and aircraft propulsion systems. Finite-time thermodynamics is used to determine the maximum power output and the corresponding thermal efficiency for an irreversible closed-cycle Brayton heat engine. A realistic model is presented, which includes three types of irreversibilities: finite thermal conductance between the working fluid and the reservoirs, heat leaks between the reservoirs, and internal irreversibility inside the Brayton heat engine. The effects of heat leaks, hot-to-cold reservoir temperature ratios, and component efficiencies on the maximum power output and the corresponding thermal efficiency are studied. With component efficiencies less than 100%, the optimum ratio of the hot-end heat exchanger conductance to the total conductance of the two heat exchangers is found to be less than 0.5. Moreover, this ratio increases as the component efficiencies and the total conductance of the two heat exchangers are increased, and decreases as the hot-to-cold reservoir temperature ratio is increased.

  18. Engine Power Turbine and Propulsion Pod Arrangement Study

    NASA Technical Reports Server (NTRS)

    Robuck, Mark; Zhang, Yiyi

    2014-01-01

    A study has been conducted for NASA Glenn Research Center under contract NNC10BA05B, Task NNC11TA80T to identify beneficial arrangements of the turboshaft engine, transmissions and related systems within the propulsion pod nacelle of NASA's Large Civil Tilt-Rotor 2nd iteration (LCTR2) vehicle. Propulsion pod layouts were used to investigate potential advantages, disadvantages, as well as constraints of various arrangements assuming front or aft shafted engines. Results from previous NASA LCTR2 propulsion system studies and tasks performed by Boeing under NASA contracts are used as the basis for this study. This configuration consists of two Fixed Geometry Variable Speed Power Turbine Engines and related drive and rotor systems (per nacelle) arranged in tilting nacelles near the wing tip. Entry-into-service (EIS) 2035 technology is assumed for both the engine and drive systems. The variable speed rotor system changes from 100 percent speed for hover to 54 percent speed for cruise by the means of a two speed gearbox concept developed under previous NASA contracts. Propulsion and drive system configurations that resulted in minimum vehicle gross weight were identified in previous work and used here. Results reported in this study illustrate that a forward shafted engine has a slight weight benefit over an aft shafted engine for the LCTR2 vehicle. Although the aft shafted engines provide a more controlled and centered CG (between hover and cruise), the length of the long rotor shaft and complicated engine exhaust arrangement outweighed the potential benefits. A Multi-Disciplinary Analysis and Optimization (MDAO) approach for transmission sizing was also explored for this study. This tool offers quick analysis of gear loads, bearing lives, efficiencies, etc., through use of commercially available RomaxDESIGNER software. The goal was to create quick methods to explore various concept models. The output results from RomaxDESIGNER have been successfully linked to Boeing spreadsheets that generate gear tooth geometry in Catia 3D environment. Another initial goal was to link information from RomaxDESIGNER (such as hp, rpm, gear ratio) to populate Boeing's parametric weight spreadsheet and create an automated method to estimate drive system weight. This was only partially achieved due to the variety of weight models, number of manual inputs, and qualitative assessments required. A simplified weight spreadsheet was used with data inputs from RomaxDESIGNER along with manual inputs to perform rough weight calculations.

  19. `Googling' Terrorists: Are Northern Irish Terrorists Visible on Internet Search Engines?

    NASA Astrophysics Data System (ADS)

    Reilly, P.

    In this chapter, the analysis suggests that Northern Irish terrorists are not visible on Web search engines when net users employ conventional Internet search techniques. Editors of mass media organisations traditionally have had the ability to decide whether a terrorist atrocity is `newsworthy,' controlling the `oxygen' supply that sustains all forms of terrorism. This process, also known as `gatekeeping,' is often influenced by the norms of social responsibility, or alternatively, with regard to the interests of the advertisers and corporate sponsors that sustain mass media organisations. The analysis presented in this chapter suggests that Internet search engines can also be characterised as `gatekeepers,' albeit without the ability to shape the content of Websites before it reaches net users. Instead, Internet search engines give priority retrieval to certain Websites within their directory, pointing net users towards these Websites rather than others on the Internet. Net users are more likely to click on links to the more `visible' Websites on Internet search engine directories, these sites invariably being the highest `ranked' in response to a particular search query. A number of factors including the design of the Website and the number of links to external sites determine the `visibility' of a Website on Internet search engines. The study suggests that Northern Irish terrorists and their sympathisers are unlikely to achieve a greater degree of `visibility' online than they enjoy in the conventional mass media through the perpetration of atrocities. Although these groups may have a greater degree of freedom on the Internet to publicise their ideologies, they are still likely to be speaking to the converted or members of the press. Although it is easier to locate Northern Irish terrorist organisations on Internet search engines by linking in via ideology, ideological description searches, such as `Irish Republican' and `Ulster Loyalist,' are more likely to generate links pointing towards the sites of research institutes and independent media organisations than sites sympathetic to Northern Irish terrorist organisations. The chapter argues that Northern Irish terrorists are only visible on search engines if net users select the correct search terms.

  20. Fusion Engineering and Design 80 (2006) 7998 Advanced power core system for the

    E-print Network

    California at San Diego, University of

    2006-01-01

    Fusion Engineering and Design 80 (2006) 79­98 Advanced power core system for the ARIES-AT power of Wisconsin, Fusion Technology Institute, 1500 Engineering Drive, Madison, WI 53706-1687, USA c.06.356 #12;80 A.R. Raffray et al. / Fusion Engineering and Design 80 (2006) 79­98 of new physics

  1. A method for reducing exhaust pressure of vehicle compressed air powered engine

    Microsoft Academic Search

    Zhenggang Xu; Xiaopeng Xie

    2009-01-01

    Compressed air powered engine is a type of zero-pollution engine, but its conversion efficiency is very low for its high pressure exhaust which causes much exergy loss. In this study, a control system was developed to reduce the exhaust pressure of vehicle compressed air powered engine. The control system is made up of a controller, a pressure sensor, a photoelectric

  2. Semantic Similarity Between Search Engine Queries Using Temporal Correlation

    E-print Network

    Immorlica, Nicole

    Research, Silicon Valley Campus Mountain View, CA schien@microsoft.com Nicole Immorlica Massachusetts to help users refine their search by suggesting alternative queries in response to a user input- search, Silicon Valley Campus. Copyright is held by the International World Wide Web Conference Com

  3. A real-time all-atom structural search engine for proteins.

    PubMed

    Gonzalez, Gabriel; Hannigan, Brett; DeGrado, William F

    2014-07-01

    Protein designers use a wide variety of software tools for de novo design, yet their repertoire still lacks a fast and interactive all-atom search engine. To solve this, we have built the Suns program: a real-time, atomic search engine integrated into the PyMOL molecular visualization system. Users build atomic-level structural search queries within PyMOL and receive a stream of search results aligned to their query within a few seconds. This instant feedback cycle enables a new "designability"-inspired approach to protein design where the designer searches for and interactively incorporates native-like fragments from proven protein structures. We demonstrate the use of Suns to interactively build protein motifs, tertiary interactions, and to identify scaffolds compatible with hot-spot residues. The official web site and installer are located at http://www.degradolab.org/suns/ and the source code is hosted at https://github.com/godotgildor/Suns (PyMOL plugin, BSD license), https://github.com/Gabriel439/suns-cmd (command line client, BSD license), and https://github.com/Gabriel439/suns-search (search engine server, GPLv2 license). PMID:25079944

  4. Nitinol Heat Engine power plant system installation and cost optimization

    SciTech Connect

    Cady, E.C.; McNichols, J.L.

    1984-08-01

    Nitinol Heat Engines (NHE) use a shape memory alloy of nickel and titanium to directly convert the thermal energy in hot water to mechanical power (and, through a generator, to electricity). The authors designed a commercial version of a NHE based on the thermoturbine configuration developed in prototype form under contract to the Department of Energy in 1978-1980. The operation and cost of various forms of NHE have been described previously, but the penalties and costs associated with integrating the complete NHE system into installations supplying the thermal energy have not previously been determined. They found that these costs are most important, as they will often exceed the costs of the NHE proper. However, the total installed costs are quite low and result in very economical power from waste-heat or geothermal hot-water sources.

  5. Internal combustion engine combined heat and power plants: Case study of the University of Perugia power plant

    Microsoft Academic Search

    Gianni Bidini; Umberto Desideri; Stefano Saetta; Pierluca Proietti Bocchini

    1998-01-01

    A performance and economic analysis of an existing combined heat and power plant with an internal combustion engine and district heating for the Faculty of Engineering of the University of Perugia is presented. Results of the first 15 months of operation are shown and discussed with reference to daily performance of the combined heat and power plant, which shows how

  6. Increasing Student Interest and Comprehension in Power Engineering Education at the Graduate and Undergraduate Levels

    E-print Network

    conversion 1. Introduction Declining student interest in electric power engineering has resulted interacting factors. Compounding the negative way some students perceive power engineering is the deregulation to maintaining the sinusoidal voltage waveshape at all load buses. Increasing reliability and selling power

  7. ENGINEERING DESIGN AND ANALYSIS OF THE ARIES-CS POWER PLANT

    E-print Network

    ENGINEERING DESIGN AND ANALYSIS OF THE ARIES-CS POWER PLANT A. R. RAFFRAY,a * L. EL-GUEBALY,b S an integrated study of a compact stellarator power plant, involving physics and engineering design optimization. Key engi- neering considerations include the size of the power core, access for maintenance

  8. Design of a High Temperature Small Particle Solar Receiver for Powering a Gas Turbine Engine

    E-print Network

    Ponce, V. Miguel

    Design of a High Temperature Small Particle Solar Receiver for Powering a Gas Turbine Engine Dr. Fletcher Miller SDSU Department of Mechanical Engineering Abstract Solar thermal power for electricity will describe the design of a high temperature solar receiver capable of driving a gas turbine for power

  9. Engineering, Financial and Net Energy Performance, and Risk Analysis for Parabolic Trough Solar Power Plants 

    E-print Network

    Luo, Jun

    2014-08-08

    concentrating solar power plant. A set of engineering performance, financial and net energy models were developed as tools to predict a plant’s engineering performance, cost and energy payback. The models were validated by comparing the predicted results...

  10. The MediaMill TRECVID 2008 Semantic Video Search Engine

    Microsoft Academic Search

    Cees G. M. Snoek; Koen E. A. Van De Sande; Ork De Rooij; Bouke Huurnink; Jan Van Gemert; J. R. R. Uijlings; Jiyin He; X. Li; I. Everts; Vladimir Nedovic; M. Van Liempt; Richard Van Balen; Maarten De Rijke; Jan-mark Geusebroek; Theo Gevers; Marcel Worring; Arnold W. M. Smeulders; Dennis Koelma; Fei Yan; M. A. Tahir; Krystian Mikolajczyk; Josef Kittler

    2008-01-01

    In this paper we describe our TRECVID 2008 video retrieval experiments. The MediaMill team participated in three tasks: concept detection, automatic search, and interac- tive search. Rather than continuing to increase the number of concept detectors available for retrieval, our TRECVID 2008 experiments focus on increasing the robustness of a small set of detectors using a bag-of-words approach. To that

  11. NeSReC: A News meta-Search Engines Result Clustering Tool

    Microsoft Academic Search

    Hassan Sayyadi; Sara Salehi; Hassan AbolHassani

    Recent years have witnessed an explosion in the availability of news articles on the World Wide Web. In addition, organizing the results of a news search facilitates the user(s) in overviewing the returned news. In this work, we have focused on the label-based clustering approaches for news meta-search engines, and which clusters news articles based on their topics. Furthermore, our

  12. HyPursuit: a hierarchical network search engine that exploits content-link hypertext clustering

    Microsoft Academic Search

    Ron Weiss; Bienvenido Vélez; Mark A. Sheldon; Chanathip Namprempre; Peter Szilagyi; Andrzej Duda; David K. Gifford

    1996-01-01

    HyPursuit is a new hierarchical network search engine that clusters hypertext documents to structure a given information space for browsing and search act ivities. Our content-link clustering algorithm is based on the semantic information embedded in hyperlink structures and document contents. HyPursuit admits multiple, coexisting cluster hierarchies based on different prin- ciples for grouping documents, such as the Library of

  13. The Engineering Research Program's search and support of new mechanical-engineering technology

    Microsoft Academic Search

    H. H. Woo; R. M. Denney; R. S. Frost; M. B. Kamelgarn

    1985-01-01

    This report summarizes the progress made in the first 6 months of the FY-85 Engineering Research Program in the Mechanical Engineering Department. The program's mission is to seek new knowledge and concepts for mechanical-engineering applications of immediate or potential interest to the Laboratory. During this reporting period the program supported 13 projects. Eleven of the projects enhanced the mechanical engineering

  14. An online portal for collaborative learning and teaching for power engineering education

    Microsoft Academic Search

    Siddharth Suryanarayanan; Elias Kyriakides

    2004-01-01

    This paper describes a web-based portal of peer-ranked sites on power engineering for educational purposes. It is a free and open resource consortium for faculty and students in power engineering. As the Internet is developing into a main educational tool, this multimedia-based application offers the educator and the student access to numerous power engineering resources. While it is possible to

  15. Performance of the NEXT Engineering Model Power Processing Unit

    NASA Technical Reports Server (NTRS)

    Pinero, Luis R.; Hopson, Mark; Todd, Philip C.; Wong, Brian

    2007-01-01

    The NASA s Evolutionary Xenon Thruster (NEXT) project is developing an advanced ion propulsion system for future NASA missions for solar system exploration. An engineering model (EM) power processing unit (PPU) for the NEXT project was designed and fabricated by L-3 Communications under contract with NASA Glenn Research Center (GRC). This modular PPU is capable of processing up from 0.5 to 7.0 kW of output power for the NEXT ion thruster. Its design includes many significant improvements for better performance over the state-of-the-art PPU. The most significant difference is the beam supply which is comprised of six modules and capable of very efficient operation through a wide voltage range because of innovative features like dual controls, module addressing, and a high current mode. The low voltage power supplies are based on elements of the previously validated NASA Solar Electric Propulsion Technology Application Readiness (NSTAR) PPU. The highly modular construction of the PPU resulted in improved manufacturability, simpler scalability, and lower cost. This paper describes the design of the EM PPU and the results of the bench-top performance tests.

  16. intro.tex 1134 2013-02-28 16:52:04Z kohlhase XLSearch: A Search Engine for Spreadsheets

    E-print Network

    Kohlhase, Michael

    intro.tex 1134 2013-02-28 16:52:04Z kohlhase XLSearch: A Search Engine for Spreadsheets anonymous employed in administration, financial forecasting, education, and science be- cause of their intuitive the XLSearch system, a novel search engine for spread- sheets. It indexes spreadsheet formulae and efficiently

  17. A Virtual Engineering Framework for Simulating Advanced Power System

    SciTech Connect

    Mike Bockelie; Dave Swensen; Martin Denison; Stanislav Borodai

    2008-06-18

    In this report is described the work effort performed to provide NETL with VE-Suite based Virtual Engineering software and enhanced equipment models to support NETL's Advanced Process Engineering Co-simulation (APECS) framework for advanced power generation systems. Enhancements to the software framework facilitated an important link between APECS and the virtual engineering capabilities provided by VE-Suite (e.g., equipment and process visualization, information assimilation). Model enhancements focused on improving predictions for the performance of entrained flow coal gasifiers and important auxiliary equipment (e.g., Air Separation Units) used in coal gasification systems. In addition, a Reduced Order Model generation tool and software to provide a coupling between APECS/AspenPlus and the GE GateCycle simulation system were developed. CAPE-Open model interfaces were employed where needed. The improved simulation capability is demonstrated on selected test problems. As part of the project an Advisory Panel was formed to provide guidance on the issues on which to focus the work effort. The Advisory Panel included experts from industry and academics in gasification, CO2 capture issues, process simulation and representatives from technology developers and the electric utility industry. To optimize the benefit to NETL, REI coordinated its efforts with NETL and NETL funded projects at Iowa State University, Carnegie Mellon University and ANSYS/Fluent, Inc. The improved simulation capabilities incorporated into APECS will enable researchers and engineers to better understand the interactions of different equipment components, identify weaknesses and processes needing improvement and thereby allow more efficient, less expensive plants to be developed and brought on-line faster and in a more cost-effective manner. These enhancements to APECS represent an important step toward having a fully integrated environment for performing plant simulation and engineering. Furthermore, with little effort the modeling capabilities described in this report can be extended to support other DOE programs, such as ultra super critical boiler development, oxy-combustion boiler development or modifications to existing plants to include CO2 capture and sequestration.

  18. Thermal energy storage for the Stirling engine powered automobile

    NASA Technical Reports Server (NTRS)

    Morgan, D. T. (editor)

    1979-01-01

    A thermal energy storage (TES) system developed for use with the Stirling engine as an automotive power system has gravimetric and volumetric storage densities which are competitive with electric battery storage systems, meets all operational requirements for a practical vehicle, and can be packaged in compact sized automobiles with minimum impact on passenger and freight volume. The TES/Stirling system is the only storage approach for direct use of combustion heat from fuel sources not suitable for direct transport and use on the vehicle. The particular concept described is also useful for a dual mode TES/liquid fuel system in which the TES (recharged from an external energy source) is used for short duration trips (approximately 10 miles or less) and liquid fuel carried on board the vehicle used for long duration trips. The dual mode approach offers the potential of 50 percent savings in the consumption of premium liquid fuels for automotive propulsion in the United States.

  19. Engineering Development of Coal-Fired High Performance Power Systems

    SciTech Connect

    None

    2000-12-31

    This report presents work carried out under contract DE-AC22-95PC95144 ''Engineering Development of Coal-Fired High Performance Systems Phase II and III.'' The goals of the program are to develop a coal-fired high performance power generation system (HIPPS) that is capable of: thermal efficiency (HHV) {ge} 47% NOx, SOx, and particulates {le} 10% NSPS (New Source Performance Standard) coal providing {ge} 65% of heat input all solid wastes benign cost of electricity {le}{le} 90% of present plants Phase I, which began in 1992, focused on the analysis of various configurations of indirectly fired cycles and on technical assessments of alternative plant subsystems and components, including performance requirements, developmental status, design options, complexity and reliability, and capital and operating costs. Phase I also included preliminary R&D and the preparation of designs for HIPPS commercial plants approximately 300 MWe in size. Phase II, had as its initial objective the development of a complete design base for the construction and operation of a HIPPS prototype plant to be constructed in Phase III. As part of a descoping initiative, the Phase III program has been eliminated and work related to the commercial plant design has been ended. The rescoped program retained a program of engineering research and development focusing on high temperature heat exchangers, e.g. HITAF development (Task 2); a rescoped Task 6 that is pertinent to Vision 21 objectives and focuses on advanced cycle analysis and optimization, integration of gas turbines into complex cycles, and repowering designs; and preparation of the Phase II Technical Report (Task 8). This rescoped program deleted all subsystem testing (Tasks 3, 4, and 5) and the development of a site-specific engineering design and test plan for the HIPPS prototype plant (Task 7). Work reported herein is from: Task 2.2 HITAF Air Heaters

  20. Engineering a novel self-powering electrochemical biosensor

    PubMed Central

    Gu, X.; Ramsay, S.; Jensen, M.; Fulton, R.; Rosser, S.; Gilbert, D.

    2010-01-01

    This paper records the efforts of a multi-disciplinary team of undergraduate students from Glasgow University to collectively design and carry out a 10 week project in Synthetic Biology as part of the international Genetic Engineered Machine competition (iGEM). The aim of the project was to design and build a self-powering electrochemical biosensor called ‘ElectrEcoBlu’. The novelty of this engineered machine lies in coupling a biosensor with a microbial fuel cell to transduce a pollution input into an easily measurable electrical output signal. The device consists of two components; the sensor element which is modular, allowing for customisation to detect a range of input signals as required, and the universal reporter element which is responsible for generating an electrical signal as an output. The genetic components produce pyocyanin, a competitive electron mediator for microbial fuel cells, thus enabling the generation of an electrical current in the presence of target chemical pollutants. The pollutants tested in our implementation were toluene and salicylate. ElectrEcoBlu is expected to drive forward the development of a new generation of biosensors. Our approach exploited a range of state-of-the-art modelling techniques in a unified framework of qualitative, stochastic and continuous approaches to support the design and guide the construction of this novel biological machine. This work shows that integrating engineering techniques with scientific methodologies can provide new insights into genetic regulation and can be considered as a reference framework for the development of biochemical systems in synthetic biology. PMID:21189841

  1. High temperature solar photon engines. [heat engines for terrestrial and space-based solar power plants

    NASA Technical Reports Server (NTRS)

    Hertzberg, A.; Decher, R.; Mattick, A. T.; Lau, C. V.

    1978-01-01

    High temperature heat engines designed to make maximum use of the thermodynamic potential of concentrated solar radiation are described. Plasmas between 2000 K and 4000 K can be achieved by volumetric absorption of radiation in alkali metal vapors, leading to thermal efficiencies up to 75% for terrestrial solar power plants and up to 50% for space power plants. Two machines capable of expanding hot plasmas using practical technology are discussed. A binary Rankine cycle uses fluid mechanical energy transfer in a device known as the 'Comprex' or 'energy exchanger.' The second machine utilizes magnetohydrodynamics in a Brayton cycle for space applications. Absorption of solar energy and plasma radiation losses are investigated for a solar superheater using potassium vapor.

  2. Effective and efficient classification on a search-engine model

    Microsoft Academic Search

    Aris Anagnostopoulos; Andrei Z. Broder; Kunal Punera

    2006-01-01

    Traditional document classification frameworks, which apply the learned classifier to each document in a corpus one by one, are infeasible for extremely large document corpora, like the Web or large corporate intranets. We consider the classification problem on a corpus that has been processed primarily for the purpose of searching, and thus our access to documents is solely through the

  3. METALICA: An Enhanced Meta Search Engine for Literature Catalogs

    Microsoft Academic Search

    Bethina Schmitt; Andreas Schmidt

    1999-01-01

    Today there is an increasing if not confusing number of services available for searching and acquiring literature. This makes it more a nd more difficult for a user to take advantage of these new services. Our goal i s to o ffer user support by providing a meta e ngine which covers the different services and unifies their access. Additionally,

  4. Andromeda: a peptide search engine integrated into the MaxQuant environment.

    PubMed

    Cox, Jürgen; Neuhauser, Nadin; Michalski, Annette; Scheltema, Richard A; Olsen, Jesper V; Mann, Matthias

    2011-04-01

    A key step in mass spectrometry (MS)-based proteomics is the identification of peptides in sequence databases by their fragmentation spectra. Here we describe Andromeda, a novel peptide search engine using a probabilistic scoring model. On proteome data, Andromeda performs as well as Mascot, a widely used commercial search engine, as judged by sensitivity and specificity analysis based on target decoy searches. Furthermore, it can handle data with arbitrarily high fragment mass accuracy, is able to assign and score complex patterns of post-translational modifications, such as highly phosphorylated peptides, and accommodates extremely large databases. The algorithms of Andromeda are provided. Andromeda can function independently or as an integrated search engine of the widely used MaxQuant computational proteomics platform and both are freely available at www.maxquant.org. The combination enables analysis of large data sets in a simple analysis workflow on a desktop computer. For searching individual spectra Andromeda is also accessible via a web server. We demonstrate the flexibility of the system by implementing the capability to identify cofragmented peptides, significantly improving the total number of identified peptides. PMID:21254760

  5. Uncovering the Hidden Web, Part I: Finding What the Search Engines Don't. ERIC Digest.

    ERIC Educational Resources Information Center

    Mardis, Marcia

    Currently, the World Wide Web contains an estimated 7.4 million sites (OCLC, 2001). Yet even the most experienced searcher, using the most robust search engines, can access only about 16% of these pages (Dahn, 2001). The other 84% of the publicly available information on the Web is referred to as the "hidden,""invisible," or "deep" Web. This…

  6. A Comparison of Information Seeking Using Search Engines and Social Networks Meredith Ringel Morris1

    E-print Network

    or email to contact someone directly. Search engine use is the most popular approach to online information There are many ways a person can satisfy an information need, including visiting a library, calling someone) or Collabio (Bernstein et al. 2009) can help a user find a person who is qualified to address their infor

  7. Detecting influenza epidemics using search engine query data 1 Detecting influenza epidemics using

    E-print Network

    Caverlee, James

    Detecting influenza epidemics using search engine query data 1 Detecting influenza epidemics using://dx.doi.org/10.1038/nature07634 Epidemics of seasonal influenza are a major public health concern, causing tens to seasonal influenza, a new strain of influenza virus against which no prior immunity exists

  8. The NASA Astrophysics Data System: The Search Engine and its User Interface

    Microsoft Academic Search

    Guenther Eichhorn; Michael J. Kurtz; Alberto Accomazzi; Carolyn S. Grant; Stephen S. Murray

    2000-01-01

    The ADS Abstract and Article Services provide access to the astronomical literature through the World Wide Web (WWW). The forms based user interface provides access to sophisticated searching capabilities that allow our users to find references in the fields of Astronomy, Physics\\/Geophysics, and astronomical Instrumentation and Engineering. The returned information includes links to other on-line information sources, creating an extensive

  9. The Effect of Brand Awareness on the Evaluation of Search Engine Results

    E-print Network

    Jansen, James

    .edu In this paper we investigate the effect of search engine brand (i.e., identifying name that distinguishes interfaces contain branding elements, such as symbols, logos, and names. A brand is the intangible sum. A brand is also identifying symbol, sign, name, or mark that distinguishes an organization or a product

  10. Polidoxa: a Sinergic Approach of a Social Network and a Search Engine

    E-print Network

    Southampton, University of

    . The problem with TV news is that the streaming of information is simply unidirectional, iPolidoxa: a Sinergic Approach of a Social Network and a Search Engine to Offer Trustworthy News potential as a news media, but the key is in the mechanism in which information is accessed. This paper

  11. Is Google enough? Comparison of an internet search engine with academic library resources

    Microsoft Academic Search

    Jan Brophy; David Bawden

    2005-01-01

    Purpose – The purpose of the study was to compare an internet search engine, Google, with appropriate library databases and systems, in order to assess the relative value, strengths and weaknesses of the two sorts of system. Design\\/methodology\\/approach – A case study approach was used, with detailed analysis and failure checking of results. The performance of the two systems was

  12. Web Dynamics and their Ramifications for the Development of Web Search Engines

    E-print Network

    Ng, Wilfred Siu Hung

    Web Dynamics and their Ramifications for the Development of Web Search Engines Yiping Ke Lin Deng Email: {keyiping, ldeng, wilfred, dlee}@cs.ust.hk Abstract The World Wide Web has become the largest with conven- tional information sources, the Web is highly dynamic in the following four factors: size (i

  13. The Quest for Correct Information on the Web: Hyper Search Engines

    Microsoft Academic Search

    Massimo Marchiori

    1997-01-01

    Abstract: Finding the right information on the World Wide Web is becoming a fundamentalproblem, since the amount of global information that the WWW contains is growing atan incredible rate. In this paper, we present a novel method for extracting from a Webobject its "hyper" informative content, in contrast with current search engines, whichonly deal with the "textual" informative content. This

  14. Chem X Seer: A Web Search Engine and Repository for e-Chemistry

    Microsoft Academic Search

    C. Lee Giles; Prasenjit Mitra; Karl Mueller; James Z. Wang; Bingjun Sun; Levent Bolelli; Ying Liu; Isaac Councill; William Brower; Qingzhao Tan; Anuj Jaiswal; James Kubicki; Barbara Garrison; Joel Bandstra; Juan Pablo Fernandez Ramirez

    Cyberinfrastructure or e-science has become crucial for scientific progress and open source systems have greatly facilitated design and implementation. In chemistry, the growth of data has been explosive and timely and effective information and data access is critical. We discuss our Chem X Seer (funded by NSF Chemistry) architecture, a portal and search engine for academic researchers in environmental chemistry,

  15. Orion: A Software Project Search Engine with Integrated Diverse Software Artifacts

    E-print Network

    Paris-Sud XI, Université de

    Orion: A Software Project Search Engine with Integrated Diverse Software Artifacts Tegawend´e F@labri.fr, ferdianthung@smu.edu.sg, davidlo@smu.edu.sg, lxjiang@smu.edu.sg, reveillere@labri.fr Abstract--Software- searchers collect project data for building experimental datasets; software programmers reuse code from

  16. A Novel Algorithm for Validating Peptide Identification from a Shotgun Proteomics Search Engine

    PubMed Central

    Jian, Ling; Niu, Xinnan; Xia, Zhonghang; Samir, Parimal; Sumanasekera, Chiranthani; Zheng, Mu; Jennings, Jennifer L.; Hoek, Kristen L.; Allos, Tara; Howard., Leigh M.; Edwards, Kathryn M.; Weil, P. Anthony; Link, Andrew J.

    2013-01-01

    Liquid chromatography coupled with tandem mass spectrometry has revolutionized the proteomics analysis of complexes, cells, and tissues. In a typical proteomic analysis, the tandem mass spectra from a LC/MS/MS experiment are assigned to a peptide by a search engine that compares the experimental MS/MS peptide data to theoretical peptide sequences in a protein database. The peptide spectra matches are then used to infer a list of identified proteins in the original sample. However, the search engines often fail to distinguish between correct and incorrect peptides assignments. In this study, we designed and implemented a novel algorithm called De-Noise to reduce the number of incorrect peptide matches and maximize the number of correct peptides at a fixed false discovery rate using a minimal number of scoring outputs from the SEQUEST search engine. The novel algorithm uses a three step process: data cleaning, data refining through a SVM-based decision function, and a final data refining step based on proteolytic peptide patterns. Using proteomics data generated on different types of mass spectrometers, we optimized the De-Noise algorithm based on the resolution and mass accuracy of the mass spectrometer employed in the LC/MS/MS experiment. Our results demonstrate De-Noise improves peptide identification compared to other methods used to process the peptide sequence matches assigned by SEQUEST. Because De-Noise uses a limited number of scoring attributes, it can be easily implemented with other search engines. PMID:23402659

  17. Querying the Semantic Web with Ginseng: A Guided Input Natural Language Search Engine

    Microsoft Academic Search

    Abraham Bernstein; Esther Kaufmann; Christian Kaiser

    The Semantic Web presents the vision of a distributed, dynamically growing knowledge base founded on formal logic. Common users, however, seem to have problems even with the simplest Boolean expression. As queries from web search engines show, the great majority of users simply do not use Boo- lean expressions. So how can we help users to query a web of

  18. A Query-Dependent Duplicate Detection Approach for Large Scale Search Engines

    Microsoft Academic Search

    Shaozhi Ye; Ruihua Song; Ji-rong Wen; Wei-ying Ma

    2004-01-01

    Duplication of Web pages greatly hurts the perceived relevance of a search engine. Existing methods for detecting duplicated Web pages can be classified into two categories, i.e. offline and online methods. The offline meth- ods target to detect all duplicates in a large set of Web pages, but none of the reported methods is capable of processing more than 30

  19. Search Engine Statistics Beyond the n-gram: Application to Noun Compound Bracketing

    Microsoft Academic Search

    Preslav Nakov; Marti Hearst

    2005-01-01

    In order to achieve the long-range goal of semantic interpretation of noun com- pounds, it is often necessary to £rst de- termine their syntactic structure. This pa- per describes an unsupervised method for noun compound bracketing which extracts statistics from Web search engines using a ´2 measure, a new set of surface features, and paraphrases. On a gold standard, the

  20. Entropy as an Indicator of Context Boundaries: An Experiment Using a Web Search Engine

    Microsoft Academic Search

    Kumiko Tanaka-ishii

    2005-01-01

    Previous works have suggested that the uncertainty of tokens coming after a sequence helps determine whether a given position is at a context boundary. This feature of language has been applied to unsupervised text segmentation and term extraction. In this paper, we fundamentally verify this feature. An experiment was performed using a web search engine, in order to clarify the

  1. A Study of Using Search Engine Page Hits as a Proxy for n-gram Frequencies

    Microsoft Academic Search

    Preslav Nakov; Marti Hearst

    The idea of using the Web as a corpus for lin- guistic research is getting increasingly popular. Most often this means using Web search engine page hit counts as estimates for n-gram frequen- cies. While the results so far have been very en- couraging, some researchers worry about what appears to be the instability of these estimates. Using a particular

  2. A Comprehensive and Systematic Model of User Evaluation of Web Search Engines: I. Theory and Background.

    ERIC Educational Resources Information Center

    Su, Louise T.

    2003-01-01

    Reports on a project that proposes and tests a comprehensive and systematic model of user evaluation of Web search engines. This article describes the model, including a set of criteria and measures and a method for implementation. A literature review portrays settings for developing the model and places applications of the model in contemporary…

  3. A User-Centered Approach to Evaluating Human Interaction with Web Search Engines: An Exploratory Study.

    ERIC Educational Resources Information Center

    Spink, Amanda

    2002-01-01

    Explores a user-centered approach to evaluating the Web search engine Inquirus. Inquirus was rated highly by users on various usability measures; all users experienced some level of shift/change in their information problem, information seeking, and personal knowledge due to their Inquirus interaction; and different users experienced different…

  4. Analysis of user attitude and behaviour in evaluating a personalized search engine

    Microsoft Academic Search

    Effie Lai-Chong Law; Tomaž Klobu?ar; Matic Pipan

    2006-01-01

    This paper reports an empirical work on user-based relevance evaluation of a personalized search engine (PSE). The aim of the work is threefold: To develop metrics for evaluating PSE; to study how users' trust in personalized information retrieval systems influences their relevance judgments; to identify patterns of relevance criteria applications. Our findings corroborate some of those of the previous work

  5. Transportation Engineering University of Florida Revised: 2/3/09 Literature Search Strategies and Resources

    E-print Network

    Slatton, Clint

    Transportation Engineering University of Florida Revised: 2/3/09 Literature Search Strategies information from transportation journals, conferences proceedings, research reports and ongoing researchLink http://springerlink.com/home/main.mpx · Elsevier Transport Connect www.transportconnect.net Note

  6. Overview of TASE 2012 talk on Search Based Software Engineering Mark Harman

    E-print Network

    Singer, Jeremy

    of tools for SBSE applications including tools for testing [8], [9], [10], [11] modularisation [12 or she is ready to undertake their first experiments. It gives advice on techniques, applications. Harman and B. F. Jones, "Search based software engineering," Information and Software Technology, vol. 43

  7. Ranking of Wikipedia articles in search engines revisited: Fair ranking for reasonable quality?

    Microsoft Academic Search

    Dirk Lewandowski; Ulrike Spree

    2011-01-01

    This paper aims to review the fiercely discussed question of whether the ranking of Wikipedia articles in search engines is justified by the quality of the articles. After an overview of current research on information quality in Wikipedia, a summary of the extended discussion on the quality of encyclopedic entries in general is given. On this basis, a heuristic method

  8. AHIS Dataset Search Engine: An intelligent approach to EML Data Management

    E-print Network

    Hall, Sharon J.

    AHIS Dataset Search Engine: An intelligent approach to EML Data Management Hung V. Nguyen, Corinna Language ­ EML format. Efficient dataset retrieval system needs to understand the important keywords with text mining techniques for ecological datasets to bridge this gap Technique: · Data extraction: Extract

  9. Online Admissions and Internet Recruiting: An Anatomy of Search Engine Placement.

    ERIC Educational Resources Information Center

    Whiteside, Richard; Mentz, George S.

    2003-01-01

    Asserts that online recruiting is a major facet of building and improving enrollment, examining: the student perspective (organizing the site, highlighting benefits and successes, ease of contact, integrating the financial side, and benefits of e-mail); search engines (ranking and recruitment, links, link popularity, and key departments and…

  10. Comparison of Search Engines Non-Neutral and Neutral Pierre Coucheney

    E-print Network

    Paris-Sud XI, Université de

    for instance [13], and this business is expected to count for about 40% of total advertising revenue [8]. Those to model two situations of a non-neutral search engine behavior, which can rank the link propositions ac for that while CPs' revenue represents an important (and increasing) part of the total network-related money

  11. A Performance Evaluation Framework for Library Search Engines Maria Soledad Pera

    E-print Network

    Ng, Yiu-Kai Dennis

    the collection of materials held by a public or private library. for retrieving library records relevant to QA Performance Evaluation Framework for Library Search Engines Maria Soledad Pera Computer Science University Provo, Utah, U.S.A. Abstract--Libraries offer valuable resources to library pa- trons

  12. Applying Elementary Landscape Analysis to Search-Based Software Engineering Guanzhou Lu, Rami Bahsoon, Xin Yao

    E-print Network

    Yao, Xin

    landscape analysis, which could be used to guide the design of more efficient algorithms. PreliminaryApplying Elementary Landscape Analysis to Search-Based Software Engineering Guanzhou Lu, Rami of problem and algorithm characteristics. In order to acheive this goal, fitness landscape charac- terisation

  13. Power supply for industrial coal liquefaction technology from an atomic power engineering fast neutron plant with intert liquid metal coolant

    Microsoft Academic Search

    V. G. Kozlovtzev; B. F. Gromov; V. M. Murogov

    1993-01-01

    To date, a vast experience in development of nuclear power plants with reactor units employing eutectic Pb-Bi alloy has been gained in organizations of the Russian Federation Ministry of Atomic Power-Experimental and Design Organization RDB {open_quotes}Hydropress{close_quotes} and Institute of Physics and Power Engineering. Practical application of such reactors as power sources for transportation purposes, has proved the correctness of the

  14. Power supply for industrial coal liquefaction technology from an atomic power engineering fast neutron plant with inert liquid metal coolant

    Microsoft Academic Search

    V. G. Kozlovzev; B. F. Gromov; V. M. Murogov; G. I. Sidorov; V. N. Stepanov; M. F. Troyanov; V. V. Chekunov; V. O. Myasnikov; V. V. Stekolnikov; V. S. Stepanov

    1993-01-01

    To date, a vast experience in development of nuclear power plants with reactor units employing eutectic Pb-Bi alloy has been gained in organizations of the Russian Federation Ministry of Atomic Power-Experimental and Design Organization RDB {open_quotes}Hydropress{close_quotes} and Institute of Physics and Power Engineering. Practical application of such reactors as power sources for transportation purposes, has proved the correctness of the

  15. Common Sense and Folksonomy: Engineering an Intelligent Search System

    Microsoft Academic Search

    M. Nauman; F. Hussain

    2007-01-01

    The massive growth of the Internet has resulted in increased difficulty in organizing and searching through the information present on it. Several strategies have been employed to tackle this problem. With the coming of Web2.0, user-created data and sharing of information among peers, community-based tagging or folksonomy has become the norm for organization of data on the Internet. The loose

  16. The MediaMill TRECVID 2011 semantic video search engine

    Microsoft Academic Search

    C. G. M. Snoek; Sande van de K. E. A; Th. Gevers; B. Huurnink; D. C. Koelma; Liempt van M; A. W. M. Smeulders; Sande van K. E. A; F. J. Seinstra; A. Thean; C. J. Veenman; M. Worring

    2011-01-01

    In this paper we describe our TRECVID 2006 experiments. The MediaMill team participated in two tasks: concept detection and search. For concept detection we use the MediaMill Challenge as experimental platform. The MediaMill Challenge divides the generic video indexing problem into a visual-only, textual-only, early fusion, late fusion, and combined analysis experiment. We provide a baseline implementation for each experiment

  17. A free-piston Stirling engine for small solar power plants

    Microsoft Academic Search

    G. Prast; A. K. de Jonge

    1978-01-01

    After a discussion of the requirements needed in a heat engine for a small solar thermal power plant a description is given of a free-piston Stirling engine, which might fulfil these requirements. The theory for the movements of the piston and displacer in the free-piston engine are given, and with a qualitative description it is shown how the machine has

  18. Power Product Equipment Technician: Outboard-Engine Systems and Service. Teacher Edition [and] Student Edition.

    ERIC Educational Resources Information Center

    Hilley, Robert

    This curriculum guide contains teacher and student materials for a course on outboard-engine boat systems and service for power product equipment technician occupations. The course contains the following four units of instruction: (1) Outboard-Engine Design and Identification; (2) Operation and Service of Engine-Support Systems; (3) Operation and…

  19. getCITED: The search engine for scholars and scientists

    NSDL National Science Digital Library

    This site is an ambitious project to facilitate searches for book chapters, working papers, conference papers, and other types of publications and academic research not commonly indexed. The project is off to a running start with over 315,000 identities and 3,250,000 publications indexed, but the site creators are requesting the cooperation of "the entire academic community." Scholars are encouraged to register with the site (for free) and enter in the details of their publications. Anyone may search the database for publications, identities, institutions, or departments, but only registered members may add or edit content. A free database created solely by and for researchers and scholars is an attractive idea and deserves support. It must be noted, however, that like so many other free online services, getCITED is searching for advertisers and sponsors and does not appear to have long-term guaranteed funding. A strong showing of support and interest from the academic community may make this task easier.

  20. Searching Science from the Office: Science and Engineering Workshops.

    ERIC Educational Resources Information Center

    Martorana, Janet; Meszaros, Rosemary L.

    1997-01-01

    Describes an approach outlined by sciences and engineering librarians at the University of California, Santa Barbara to attract users--specifically graduate students and faculty--to the available online databases and services. The strategy focused on the essentials of planning, preparation and publicity, presentation, and post-workshop evaluation.…

  1. What is the prevalence of health-related searches on the World Wide Web? Qualitative and quantitative analysis of search engine queries on the Internet

    PubMed Central

    Eysenbach, G.; Kohler, Ch.

    2003-01-01

    While health information is often said to be the most sought after information on the web, empirical data on the actual frequency of health-related searches on the web are missing. In the present study we aimed to determine the prevalence of health-related searches on the web by analyzing search terms entered by people into popular search engines. We also made some preliminary attempts in qualitatively describing and classifying these searches. Occasional difficulties in determining what constitutes a “health-related” search led us to propose and validate a simple method to automatically classify a search string as “health-related”. This method is based on determining the proportion of pages on the web containing the search string and the word “health”, as a proportion of the total number of pages with the search string alone. Using human codings as gold standard we plotted a ROC curve and determined empirically that if this “co-occurance rate” is larger than 35%, the search string can be said to be health-related (sensitivity: 85.2%, specificity 80.4%). The results of our “human” codings of search queries determined that about 4.5% of all searches are “health-related”. We estimate that globally a minimum of 6.75 Million health-related searches are being conducted on the web every day, which is roughly the same number of searches that have been conducted on the NLM Medlars system in 1996 in a full year. PMID:14728167

  2. NextSearch: A Search Engine for Mass Spectrometry Data against a Compact Nucleotide Exon Graph.

    PubMed

    Kim, Hyunwoo; Park, Heejin; Paek, Eunok

    2015-07-01

    Proteogenomics research has been using six-frame translation of the whole genome or amino acid exon graphs to overcome the limitations of reference protein sequence database; however, six-frame translation is not suitable for annotating genes that span over multiple exons, and amino acid exon graphs are not convenient to represent novel splice variants and exon skipping events between exons of incompatible reading frames. We propose a proteogenomic pipeline NextSearch (Nucleotide EXon-graph Transcriptome Search) that is based on a nucleotide exon graph. This pipeline consists of constructing a compact nucleotide exon graph that systematically incorporates novel splice variations and a search tool that identifies peptides by directly searching the nucleotide exon graph against tandem mass spectra. Because our exon graph stores nucleotide sequences, it can easily represent novel splice variations and exon skipping events between incompatible reading frame exons. Searching for peptide identification is performed against this nucleotide exon graph, without converting it into a protein sequence in FASTA format, achieving an order of magnitude reduction in the size of the sequence database storage. NextSearch outputs the proteome-genome/transcriptome mapping results in a general feature format (GFF) file, which can be visualized by public tools such as the UCSC Genome Browser. PMID:26004133

  3. Expansion machine for a low power-output steam Rankine-cycle engine

    Microsoft Academic Search

    O. Badr; S. Naik; P. W. OCallaghan; S. D. Probert

    1991-01-01

    The performance of the expansion device in a Rankine-cycle engine is one of the major parameters dictating the engine's overall energy-conversion efficiency. In this paper, the screening process undertaken to choose the most suitable expansion machine for a steam Rankine-cycle engine, operating principally as a [`]mini' combined heat-and-power unit, is described. In the low power-output range (i.e. 5-20 kW) envisaged

  4. A Novel Real-Time Searching Method for Power System Splitting Boundary

    Microsoft Academic Search

    C. G. Wang; B. H. Zhang; Z. G. Hao; J. Shu; P. Li; Z. Q. Bo

    2010-01-01

    It is possible to prevent collapse of the whole post-fault power system, which is in unstable condition, by determining the splitting boundary so as to calm down the system oscillation. A fast method of searching for the splitting boundary of power system controlled islanding is presented in this paper, the aim of which is to minimize the load-generation imbalance in

  5. The Efficient Offline Search System for High Risk Events of Power Systems Caused by Transient Stability

    Microsoft Academic Search

    Tetsushi Miki

    2007-01-01

    Power systems become large and complex, so the occurrence rates of a great deal of energy loss caused by faults become high. In this situation, the development of the efficient search system for high risk events of power systems is strongly required. Risk is defined as the product of energy loss and its occurrence rate, considering that the goal of

  6. The Efficient Search Method for High Risk Events of Power Systems by Use of Knowledge Bases

    Microsoft Academic Search

    TETSUSHI MIKI

    2006-01-01

    Power systems become large and complex, so the occurrence rates of a great deal of energy loss caused by faults become high. In this situation, the development of the efficient search method for high risk events of power systems is strongly required. Risk is defined as the product of energy loss and its occurrence rate, considering that the goal of

  7. The Efficient Search Method for High Risk Events of Power Systems Caused by Natural Disasters

    Microsoft Academic Search

    TETSUSHI MIKI

    2007-01-01

    Power systems become large and complex, so the occurrence rates of a great deal of energy loss caused by faults become high. In this situation, the development of the efficient search method for high risk events of power systems is strongly required. Risk is defined as the product of energy loss and its occurrence rate, considering that the goal of

  8. Developing a distributed HTML5-based search engine for geospatial resource discovery

    NASA Astrophysics Data System (ADS)

    ZHOU, N.; XIA, J.; Nebert, D.; Yang, C.; Gui, Z.; Liu, K.

    2013-12-01

    With explosive growth of data, Geospatial Cyberinfrastructure(GCI) components are developed to manage geospatial resources, such as data discovery and data publishing. However, the efficiency of geospatial resources discovery is still challenging in that: (1) existing GCIs are usually developed for users of specific domains. Users may have to visit a number of GCIs to find appropriate resources; (2) The complexity of decentralized network environment usually results in slow response and pool user experience; (3) Users who use different browsers and devices may have very different user experiences because of the diversity of front-end platforms (e.g. Silverlight, Flash or HTML). To address these issues, we developed a distributed and HTML5-based search engine. Specifically, (1)the search engine adopts a brokering approach to retrieve geospatial metadata from various and distributed GCIs; (2) the asynchronous record retrieval mode enhances the search performance and user interactivity; (3) the search engine based on HTML5 is able to provide unified access capabilities for users with different devices (e.g. tablet and smartphone).

  9. Control scheme for power modulation of a free piston Stirling engine

    SciTech Connect

    Dhar, M.

    1989-10-17

    This patent describes a control system for power modulation of a free piston Stirling engine. It comprises: a receiver adapted to absorb solar energy and to convert the solar energy into thermal energy; a power module comprising a displacer type free piston Stirling engine having power and displacer pistons, and a linear alternator connected to the engine, the power module adapted to receive and to convert the thermal energy into electrical energy; a utility grid adapted to receive the electrical energy from the power module; an autotransformer connected in series between the linear alternator and the grid, the autotransformer being connected by feedback means to the receiver so that a change in solar insolation to the receiver varies the autotransformer turns ratio thus changing the linear alternator's terminal voltage and changing power piston and displacer piston amplitude accordingly to maintain a high engine efficiency cycle over a large operating range for solar insolation absorbed by the receiver.

  10. Search IQ

    NSDL National Science Digital Library

    Yet another in a large collection of sites on search engines, Search IQ is notable for two features. First, its collection of search engine reviews is rather extensive, covering far more than the usual dozen or so listed at most search engine review sites. Although rankings and full reviews are offered for only 17 engines, the individual and meta-search engine listings offer at least a sentence or two on many more. The other key section of the site is a fairly large directory of specialized search engines, organized by subject. Additional resources at the site include daily tips, tutorials and guides, and a listing of new search engines.

  11. Analysis of Apex Seal Friction Power Loss in Rotary Engines

    NASA Technical Reports Server (NTRS)

    Handschuh, Robert F.; Owen, A. Karl

    2010-01-01

    An analysis of the frictional losses from the apex seals in a rotary engine was developed. The modeling was initiated with a kinematic analysis of the rotary engine. Next a modern internal combustion engine analysis code was altered for use in a rotary engine to allow the calculation of the internal combustion pressure as a function of rotor rotation. Finally the forces from the spring, inertial, and combustion pressure on the seal were combined to provide the frictional horsepower assessment.

  12. Single Phase Passive Rectification Versus Active Rectification Applied to High Power Stirling Engines

    NASA Technical Reports Server (NTRS)

    Santiago, Walter; Birchenough, Arthur G.

    2006-01-01

    Stirling engine converters are being considered as potential candidates for high power energy conversion systems required by future NASA explorations missions. These types of engines typically contain two major moving parts, the displacer and the piston, in which a linear alternator is attached to the piston to produce a single phase sinusoidal waveform at a specific electric frequency. Since all Stirling engines perform at low electrical frequencies (less or equal to 100 Hz), space explorations missions that will employ these engines will be required to use DC power management and distribution (PMAD) system instead of an AC PMAD system to save on space and weight. Therefore, to supply such DC power an AC to DC converter is connected to the Stirling engine. There are two types of AC to DC converters that can be employed, a passive full bridge diode rectifier and an active switching full bridge rectifier. Due to the inherent line inductance of the Stirling Engine-Linear Alternator (SE-LA), their sinusoidal voltage and current will be phase shifted producing a power factor below 1. In order to keep power the factor close to unity, both AC to DC converters topologies will implement power factor correction. This paper discusses these power factor correction methods as well as their impact on overall mass for exploration applications. Simulation results on both AC to DC converters topologies with power factor correction as a function of output power and SE-LA line inductance impedance are presented and compared.

  13. 338 IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 19, NO. 2, FEBRUARY 2011 Low Power Chien Search for BCH Decoder

    E-print Network

    Chen, Chunhong

    Low Power Chien Search for BCH Decoder Using RT-Level Power Management Shu-Yi Wong, Chunhong Chen's power consumption, Chien search is a critical step in the binary BCH decoding process for many portable) power management with significant power savings. The proposed Chien search is implemented for a (255

  14. Witnessing power: John Elder and the making of the marine compound engine, 1850-1858.

    PubMed

    Smith, Crosbie

    2014-01-01

    Shipowners' seemingly slow adoption of marine compound engines is often attributed to not appreciating the new technology's superior economy. This article argues that this slow adoption needs to be understood alongside the challenges faced by engine builders in persuading skeptical shipowners and practical engineers that their designs were trustworthy. It explores the rich cultural contexts within which Glasgow master engineer John Elder and his associates rendered their marine compound engines credible for Liverpool's Pacific Steam Navigation Company, the first line to deploy the new engine. Elder operated within a culture whose hallmarks were useful work, economy, and the power of direct witnessing. The article also explores the role of William McNaught, an independent consultant with a strong track record as both a practical engineer and the inventor of a steam-engine indicator. His indicator, deployed to evaluate the performance of Elder's compound engines, stood at the center of the controversy over their economy. PMID:24988795

  15. Comparison of Four Search Engines and their efficacy With Emphasis on Literature Research in Addiction (Prevention and Treatment)

    PubMed Central

    Samadzadeh, Gholam Reza; Rigi, Tahereh; Ganjali, Ali Reza

    2013-01-01

    Background Surveying valuable and most recent information from internet, has become vital for researchers and scholars, because every day, thousands and perhaps millions of scientific works are brought out as digital resources which represented by internet and researchers can’t ignore this great resource to find related documents for their literature search, which may not be found in any library. With regard to variety of documents presented on the internet, search engines are one of the most effective search tools for finding information. Objectives The aim of this study is to evaluate the three criteria, recall, preciseness and importance of the four search engines which are PubMed, Science Direct, Google Scholar and federated search of Iranian National Medical Digital Library in addiction (prevention and treatment) to select the most effective search engine for offering the best literature research. Materials and Methods This research was a cross-sectional study by which four popular search engines in medical sciences were evaluated. To select keywords, medical subject heading (Mesh) was used. We entered given keywords in the search engines and after searching, 10 first entries were evaluated. Direct observation was used as a mean for data collection and they were analyzed by descriptive statistics (number, percent number and mean) and inferential statistics, One way analysis of variance (ANOVA) and post hoc Tukey in Spss. 15 statistical software. P Value < 0.05 was considered statistically significant. Results Results have shown that the search engines had different operations with regard to the evaluated criteria. Since P Value was 0.004 < 0.05 for preciseness and was 0.002 < 0.05 for importance, it shows significant difference among search engines. PubMed, Science Direct and Google Scholar were the best in recall, preciseness and importance respectively. Conclusions As literature research is one of the most important stages of research, it's better for researchers, especially Substance-Related Disorders scholars to use different search engines with the best recall, preciseness and importance in that subject field to reach desirable results while searching and they don’t depend on just one search engine. PMID:24971257

  16. The Power Quality Database: a software tool for utility engineers to solve problems

    Microsoft Academic Search

    B. Dabbs; J. Lamoree; B. Zavadil; M. Samotyj

    1995-01-01

    The Power Quality Database is a software product designed to help engineers evaluate power quality problems on electric utility systems and within end-use facilities. It provides examples of power quality case studies in a variety of different categories along with a wide variety of additional reference information to facilitate the investigation and reporting process. The database includes the results of

  17. Facilitating Constructive Alignment in Power Systems Engineering Education Using Free and Open-Source Software

    ERIC Educational Resources Information Center

    Vanfretti, L.; Milano, F.

    2012-01-01

    This paper describes how the use of free and open-source software (FOSS) can facilitate the application of constructive alignment theory in power systems engineering education by enabling the deep learning approach in power system analysis courses. With this aim, this paper describes the authors' approach in using the Power System Analysis Toolbox…

  18. MEEG 435/667 Wind Power Engineering (3 credits) Spring Semester 2008

    E-print Network

    Firestone, Jeremy

    MEEG 435/667 Wind Power Engineering (3 credits) Spring Semester 2008 Prof. Len Schwartz SPL 309-element theories. 5. The numerical prediction of wind power performance. Available numerical models. NREL and RERL. Additional References: 1. R. Gasch & J. Tweele, "Wind Power Plants: Fundamentals, Design, Construction

  19. Solar Power Forecasting at UC San Diego Jan Kleissl, Dept of Mechanical & Aerospace Engineering, UCSD

    E-print Network

    Fainman, Yeshaiahu

    Solar Power Forecasting at UC San Diego Jan Kleissl, Dept of Mechanical & Aerospace Engineering, UCSD Background In performancebased tariff structures, the economics of solar power on the gridscale the economics of solar power. However, accurate short term forecasting of cloudiness is required for efficient

  20. A Better Steam Engine: Designing a Distributed Concentrating Solar Combined Heat and Power System

    E-print Network

    California at Berkeley, University of

    A Better Steam Engine: Designing a Distributed Concentrating Solar Combined Heat and Power System of analysis of Distributed Concentrating Solar Combined Heat and Power (DCS-CHP) systems is a design of a theoretical solar CHP system. Then, we explore the economic and technological impetus for a solar powered

  1. Stirling Engines for Low-Temperature Solar-Thermal-Electric Power Generation

    E-print Network

    Sanders, Seth

    Stirling Engines for Low-Temperature Solar-Thermal- Electric Power Generation Artin Der Minassians-Temperature Solar-Thermal-Electric Power Generation by Artin Der Minassians Karshenasi (Amirkabir University-Temperature Solar-Thermal-Electric Power Generation Copyright c 2007 by Artin Der Minassians #12;1 Abstract Stirling

  2. Crescendo: A Protein Sequence Database Search Engine for Tandem Mass Spectra.

    PubMed

    Wang, Jianqi; Zhang, Yajie; Yu, Yonghao

    2015-07-01

    A search engine that discovers more peptides reliably is essential to the progress of the computational proteomics. We propose two new scoring functions (L- and P-scores), which aim to capture similar characteristics of a peptide-spectrum match (PSM) as Sequest and Comet do. Crescendo, introduced here, is a software program that implements these two scores for peptide identification. We applied Crescendo to test datasets and compared its performance with widely used search engines, including Mascot, Sequest, and Comet. The results indicate that Crescendo identifies a similar or larger number of peptides at various predefined false discovery rates (FDR). Importantly, it also provides a better separation between the true and decoy PSMs, warranting the future development of a companion post-processing filtering algorithm. Graphical Abstract ?. PMID:25895889

  3. 75 FR 11914 - Chrysler, LLC, Mack Avenue Engine Plants 1 & 2, Power Train Division, Including On-Site Leased...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-03-12

    ...Engine Plants 1 & 2, Power Train Division, Detroit, Michigan...Engine Plants 1 & 2, Power Train Division. The Department has...were sufficiently under the control of the subject firm to be considered...Engine Plants 1 & 2, Power Train Division. The amended...

  4. Power and Performance Tabu Search Based Multicore Network-on-Chip Design

    Microsoft Academic Search

    Anita Tino; Gul N. Khan

    2010-01-01

    This paper presents a Tabu search based approach for the topology synthesis of application-specific multicore architectures using an automated design technique. The Tabu search method incorporates multiple objectives in order to generate an optimal NoC topology which accounts for both power and performance factors. The method generates a system-level floorplan in each major stage of the topology synthesis. By incorporating

  5. A web search engine model based on index-query bit-level compression

    Microsoft Academic Search

    Hussein Al-Bahadili; Saif Al-Saab; Reyadh Naoum; Shakir M. Hussain

    2010-01-01

    In this paper, we propose a new web search engine model based on index-query bit-level compression. The model incorporates two bit-level compression layers both implemented at the backend processor (server) side, one layer resides after the indexer acting as a second compression layer to generate a double compressed index, and the second layer be located after the query parser for

  6. Development of a Google-based search engine for data mining radiology reports.

    PubMed

    Erinjeri, Joseph P; Picus, Daniel; Prior, Fred W; Rubin, David A; Koppel, Paul

    2009-08-01

    The aim of this study is to develop a secure, Google-based data-mining tool for radiology reports using free and open source technologies and to explore its use within an academic radiology department. A Health Insurance Portability and Accountability Act (HIPAA)-compliant data repository, search engine and user interface were created to facilitate treatment, operations, and reviews preparatory to research. The Institutional Review Board waived review of the project, and informed consent was not required. Comprising 7.9 GB of disk space, 2.9 million text reports were downloaded from our radiology information system to a fileserver. Extensible markup language (XML) representations of the reports were indexed using Google Desktop Enterprise search engine software. A hypertext markup language (HTML) form allowed users to submit queries to Google Desktop, and Google's XML response was interpreted by a practical extraction and report language (PERL) script, presenting ranked results in a web browser window. The query, reason for search, results, and documents visited were logged to maintain HIPAA compliance. Indexing averaged approximately 25,000 reports per hour. Keyword search of a common term like "pneumothorax" yielded the first ten most relevant results of 705,550 total results in 1.36 s. Keyword search of a rare term like "hemangioendothelioma" yielded the first ten most relevant results of 167 total results in 0.23 s; retrieval of all 167 results took 0.26 s. Data mining tools for radiology reports will improve the productivity of academic radiologists in clinical, educational, research, and administrative tasks. By leveraging existing knowledge of Google's interface, radiologists can quickly perform useful searches. PMID:18392657

  7. Switch mode power supplies: an EMI engineer's point of view

    Microsoft Academic Search

    Travis Carter

    1994-01-01

    Almost every electronic device requires some level of power conversion in which the required operational voltages are generated from the input power. The majority of these supplies consist of Switch Mode Power Supplies (SMPS) which all operate on the same basic principles (Lent's Law) but can take on several different design topologies. The downfall of this small and efficient power

  8. The STOL performance of a two-engine, USB powered-lift aircraft with cross-shafted fans

    NASA Technical Reports Server (NTRS)

    Stevens, V. C.; Wilson, S. B., III; Zola, C. A.

    1985-01-01

    The short takeoff and landing capabilities that characterize the performance of powered-lift aircraft are dependent on engine thrust and are, therefore, severely affected by loss of an engine. This paper shows that the effects of engine loss on the short takeoff and landing performance of powered-lift aircraft can be effectively mitigated by cross-shafting the engine fans in a twin-engine configuration. Engine-out takeoff and landing performances are compared for three powered-lift aircraft configurations: one with four engines, one with two engines, and one with two engines in which the fans are cross-shafted. The results show that the engine-out takeoff and landing performance of the cross-shafted two-engine configuration is significantly better than that of the two-engine configuration without cross-shafting.

  9. PubMed vs. HighWire Press: A head-to-head comparison of two medical literature search engines

    Microsoft Academic Search

    Thomas E. Vanhecke; Michael A. Barnes; Janet Zimmerman; Sandor Shoichet

    2007-01-01

    PubMed and HighWire Press are both useful medical literature search engines available for free to anyone on the internet. We measured retrieval accuracy, number of results generated, retrieval speed, features and search tools on HighWire Press and PubMed using the quick search features of each. We found that using HighWire Press resulted in a higher likelihood of retrieving the desired

  10. A free cylinder Stirling engine solar powered water pump

    Microsoft Academic Search

    W. T. Beale

    1979-01-01

    This paper describes a free cylinder Stirling engine expressly designed for use as a solar water pump. The pumping action takes place as a result of the reciprocating motion of the cylinder of the sealed free piston engine, this cylinder motion being used to directly drive a reciprocating water pump. A 250 watt unit is described, comprised of a free

  11. Creative Engineering Based Education with Autonomous Robots Considering Job Search Support

    NASA Astrophysics Data System (ADS)

    Takezawa, Satoshi; Nagamatsu, Masao; Takashima, Akihiko; Nakamura, Kaeko; Ohtake, Hideo; Yoshida, Kanou

    The Robotics Course in our Mechanical Systems Engineering Department offers “Robotics Exercise Lessons” as one of its Problem-Solution Based Specialized Subjects. This is intended to motivate students learning and to help them acquire fundamental items and skills on mechanical engineering and improve understanding of Robotics Basic Theory. Our current curriculum was established to accomplish this objective based on two pieces of research in 2005: an evaluation questionnaire on the education of our Mechanical Systems Engineering Department for graduates and a survey on the kind of human resources which companies are seeking and their expectations for our department. This paper reports the academic results and reflections of job search support in recent years as inherited and developed from the previous curriculum.

  12. U.S. Power and Energy Engineering Workforce Collaborative Press Release

    E-print Network

    the grid from cyber attacks, reduce carbon emissions, and make the grid smarter. Steps need to be taken educating the next generation of power engineers, universities are sources of technology innovations needed

  13. 40 CFR 1051.140 - What is my vehicle's maximum engine power and displacement?

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...cc. Calculate the engine's intended swept volume from the design specifications for the cylinders using enough significant figures to allow determination of the displacement to the nearest 0.1 cc. (c) The nominal power curve and...

  14. 40 CFR 1051.140 - What is my vehicle's maximum engine power and displacement?

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...cc. Calculate the engine's intended swept volume from the design specifications for the cylinders using enough significant figures to allow determination of the displacement to the nearest 0.1 cc. (c) The nominal power curve and...

  15. 40 CFR 1051.140 - What is my vehicle's maximum engine power and displacement?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...cc. Calculate the engine's intended swept volume from the design specifications for the cylinders using enough significant figures to allow determination of the displacement to the nearest 0.1 cc. (c) The nominal power curve and...

  16. 40 CFR 1051.140 - What is my vehicle's maximum engine power and displacement?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...cc. Calculate the engine's intended swept volume from the design specifications for the cylinders using enough significant figures to allow determination of the displacement to the nearest 0.1 cc. (c) The nominal power curve and...

  17. Illinois Institute of Technology Electrical and Computer Engineering

    E-print Network

    Heller, Barbara

    Illinois Institute of Technology Electrical and Computer Engineering Department Chair Search of the Electrical and Computer Engineering (ECE) Department (www.ece.iit.edu). IIT is a private research university of power engineering, image and signal processing, communications engineering, computer engineering

  18. Development of solar and micro co-generation power installations on the basis of Stirling engines

    Microsoft Academic Search

    K. Makhkamov; V. Trukhov; B. Orunov; A. Korobkov; A. Lejebokov; I. Tursunbaev; E. Orda; V. Chuvichkin; G. Yudin; E. Muhamediev; D. B. Ingham

    2000-01-01

    In this paper the research activities of the Laboratory for Stirling Engines at the Physical-Technical Institute, Tashkent on the development of solar and micro cogeneration power installations with Stirling engines are described. Schematic sketches and design and performance parameters of a 1 kW dish\\/Stirling engine unit with a parabolic concentrator and of a solar water pump installation, incorporating a Stirling

  19. Power sources for search and rescue 406 MHz beacons

    NASA Technical Reports Server (NTRS)

    Attia, Alan I.; Perrone, David E.

    1987-01-01

    The results of a study directed at the selection of a commercially available, safe, low cost, light weight and long storage life battery for search and rescue (Sarsat) 406 MHz emergency beacons are presented. In the course of this work, five electrochemical systems (lithium-manganese dioxide, lithium-carbon monofluoride, lithium-silver vanadium oxide, alkaline cells, and cadmium-mercuric oxide) were selected for limited experimental studies to determine their suitability for this application. Two safe, commercially available batteries (lithium-manganese dioxide and lithium-carbon monofluoride) which meet the near term requirements and several alternatives for the long term were identified.

  20. An innovative industry-university partnership to enhance university training and industry recruiting in power engineering

    Microsoft Academic Search

    G. Joos; R. Marceau; G. Scott; D. Peloquin

    2004-01-01

    Summary form only given. Many universities have in the late 1990s reduced the number of courses in Power Engineering preferring to devote their resources to other areas such as information technologies. This comes at a time when it is predicted that a significant number of engineers are retiring in the next decade, in some utilities, more than a third. A

  1. An innovative industry-university partnership to enhance university training and industry recruiting in power engineering

    Microsoft Academic Search

    G. Joos; R. J. Marceau; G. Scott; D. Peloquin

    2004-01-01

    Many universities have in the late 1990s reduced the number of courses in power engineering, preferring to devote their resources to other areas such as information technologies. This comes at a time when it is predicted that a significant number of engineers will be retiring in the next decade, in some utilities, more than a third. A leading utility in

  2. Kinematic Stirling engine as an energy conversion subsystem for paraboloidal dish solar thermal power plants

    Microsoft Academic Search

    1984-01-01

    The potential of a suitably designed and economically manufactured Stirling engine as the energy conversion subsystem of a paraboloidal dish-Stirling solar thermal power module has been estimated. Results obtained by elementary cycle analyses have been shown to match quite well the performance characteristics of an advanced kinematic Stirling engine, the United Stirling P-40, as established by current prototypes of the

  3. A Silicon-Based Micro Gas Turbine Engine for Power Generation

    Microsoft Academic Search

    X.-C. Shan; Z.-F. Wang; Ryutaro Maeda; Y. F. Sun; M. Wu; J. S. Hua

    2007-01-01

    This paper reports on our research in developing a micro power generation system based on gas turbine engine and piezoelectric converter. The micro gas turbine engine consists of a micro combustor, a turbine and a centrifugal compressor. Comprehensive simulation has been implemented to optimal the component design. We have successfully demonstrated a silicon-based micro combustor, which consists of seven layers

  4. Recent technology development of high-powered rotary engine at Mazda

    Microsoft Academic Search

    Muroki

    1984-01-01

    In response to today's market demands, technological development for high-powered rotary engines has been under way for application to passenger models and racing engines. This paper, describes first the development work devoted to achieve higher output, including a turbocharger system, tuned induction and exhaust systems, combustion chamber shape, ignition system. New technologies used for components so as to cope with

  5. Power Product Equipment Technician: Outboard-Engine Boat Systems. Teacher Edition [and] Student Edition.

    ERIC Educational Resources Information Center

    Hilley, Robert

    This curriculum guide contains teacher and student materials for a course on outboard-engine boat systems for power product equipment technician occupations. The course contains the following three units of instruction: (1) Orientation to Outboard-Engine Boat Systems and Rigging; (2) Trailers and Safe Towing and Boat Operation; and (3) Seasonal…

  6. Power and efficiency limits for internal combustion engines via methods of finite-time thermodynamics

    E-print Network

    Berry, R. Stephen

    Power and efficiency limits for internal combustion engines via methods of finite of internal combustion engines two ways of ap- proaching the problem are possible.We could incorporate of improving internal combustion enginesare presented. I. INTRODUCTION "In selecting an idealized processone

  7. Impact of Commercial Search Engines and International Databases on Engineering Teaching and Research

    ERIC Educational Resources Information Center

    Chanson, Hubert

    2007-01-01

    For the last three decades, the engineering higher education and professional environments have been completely transformed by the "electronic/digital information revolution" that has included the introduction of personal computer, the development of email and world wide web, and broadband Internet connections at home. Herein the writer compares…

  8. In Proceedings of the 32nd International Symposium on Computer Architecture, June, 2005 A Tree Based Router Search Engine Architecture

    E-print Network

    Wang, Deli

    Based Router Search Engine Architecture With Single Port Memories Florin Baboescu , Dean M. Tullsen, susingh£ @cs.ucsd.edu grosu@cs.uiuc.edu Abstract Pipelined forwarding engines are used in core routers is the need to provide high packet forwarding rates through the router. This paper presents a novel

  9. Low-Power Limited-Search Parallel State Viterbi Decoder Implementation Based on Scarce State Transition

    Microsoft Academic Search

    Jie Jin; Chi-ying Tsui

    2007-01-01

    In this paper, a low-power Viterbi decoder design based on scarce state transition (SST) is presented. A low complexity algorithm based on a limited search algorithm, which reduces the average number of the add-compare-select computation of the Viterbi algorithm, is proposed and seamlessly integrated with the SST-based decoder. The new decoding scheme has low overhead and facilitates low-power implementation for

  10. Engineering support for magnetohydrodynamic power plant analysis and design studies

    NASA Technical Reports Server (NTRS)

    Carlson, A. W.; Chait, I. L.; Marchmont, G.; Rogali, R.; Shikar, D.

    1980-01-01

    The major factors which influence the economic engineering selection of stack inlet temperatures in combined cycle MHD powerplants are identified and the range of suitable stack inlet temperatures under typical operating conditions is indicated. Engineering data and cost estimates are provided for four separately fired high temperature air heater (HTAH) system designs for HTAH system thermal capacity levels of 100, 250, 500 and 1000 MWt. An engineering survey of coal drying and pulverizing equipment for MHD powerplant application is presented as well as capital and operating cost estimates for varying degrees of coal pulverization.

  11. Differential Evolution Based Intelligent System State Search Method for Composite Power System Reliability Evaluation

    NASA Astrophysics Data System (ADS)

    Bakkiyaraj, Ashok; Kumarappan, N.

    2014-07-01

    This paper presents a new approach for evaluating the reliability indices of a composite power system that adopts binary differential evolution (BDE) algorithm in the search mechanism to select the system states. These states also called dominant states, have large state probability and higher loss of load curtailment necessary to maintain real power balance. A chromosome of a BDE algorithm represents the system state. BDE is not applied for its traditional application of optimizing a non-linear objective function, but used as tool for exploring more number of dominant states by producing new chromosomes, mutant vectors and trail vectors based on the fitness function. The searched system states are used to evaluate annualized system and load point reliability indices. The proposed search methodology is applied to RBTS and IEEE-RTS test systems and results are compared with other approaches. This approach evaluates the indices similar to existing methods while analyzing less number of system states.

  12. Self-evaluation in Advanced Power Searching and Mapping with Google MOOCs

    E-print Network

    Tomkins, Andrew

    Self-evaluation in Advanced Power Searching and Mapping with Google MOOCs Julia Wilkowski Google 1600 Amphitheatre Parkway Mountain View, CA 94304 Wilkowski@Google.com Daniel M. Russell Google 1600 Amphitheatre Parkway Mountain View, CA 94304 DRussell@Google.com Amit Deutsch Google 1600 Amphitheatre Parkway

  13. MATROID MATCHING: THE POWER OF LOCAL SEARCH JON LEE, MAXIM SVIRIDENKO, AND JAN VONDRAK

    E-print Network

    Vondrak, Jan

    MATROID MATCHING: THE POWER OF LOCAL SEARCH JON LEE, MAXIM SVIRIDENKO, AND JAN VONDR´AK Abstract. We consider the classical matroid matching problem. Unweighted matroid matching for linearly-represented matroids was solved by Lov´asz, and the problem is known to be intractable for general matroids. We present

  14. Matroid Matching: the Power of Local Search Jon Lee Maxim Sviridenko Jan Vondrak

    E-print Network

    Sviridenko, Maxim

    Matroid Matching: the Power of Local Search Jon Lee Maxim Sviridenko Jan Vondr´ak April 30, 2010 Abstract We consider the classical matroid matching problem. Unweighted ma- troid matching for linearly-represented matroids was solved by Lov´asz, and the problem is known to be intractable for general matroids. We present

  15. This paper has been submitted to the Journal of Universal Computer Science. ProFusion*: Intelligent Fusion from Multiple, Distributed Search Engines1

    E-print Network

    Kansas, University of

    to submit each query to multiple search engines and wade through the resulting flood of good information that is relevant to a user's interest. Search tools such as InfoSeek [InfoSeek 1996] and Lycos [Lycos 1996] index-based queries. Given a query, such search tools search their individual index and present the user with a list

  16. Study of bimetallic liners in power diesel engines

    Microsoft Academic Search

    B. M. Astashkevich; S. A. Sapozhnikov; A. S. Bulyuk

    2007-01-01

    Liners in cylinders of diesel engines are a key component of the cylinder-and-piston unit, therefore, their design and the material of which they are made must meet stringent requirements. Analysis of failures of diesel-locomotive and marine diesel engines has shown that 10?15% of liners fail owing to fatigue and cavitation damage. Liners are made of cast irons and steels differing

  17. Two stroke internal combustion engine having an intake piston adjacent each power piston

    Microsoft Academic Search

    1994-01-01

    A two stroke internal combustion engine having an intake piston which feeds air to an adjacent power piston. Both the intake piston and the power piston are held in oscillating cylinder assemblies and the piston rods are integral with the pistons so that the piston rod is always in line with the piston. The cylinder assemblies are both supported by

  18. A hydrogen fuelled internal combustion engine designed for single speed\\/power operation

    Microsoft Academic Search

    P. Van Blarigan; J. O. Keller

    1998-01-01

    Sandia National Laboratory is developing from first principles a hydrogen fuelled internal combustion engine for driving an electrical generator that can be utilized either as a stationary power set or the auxiliary power unit in a hybrid vehicle. The intent is to take advantage of hydrogen's unique fuel characteristics and the constant speed characteristics of generator sets to maximize thermal

  19. Stationary diesel engines for use with generators to supply electric power

    NASA Technical Reports Server (NTRS)

    1977-01-01

    The procurement of stationary diesel engines for on-site generation of electric power deals with technical criteria and policy relating to federal agency, not electrical components of diesel-generator sets or for the design of electric-power generating plants or their air-pollution or noise control equipment.

  20. On the Power of Clause-Learning SAT Solvers as Resolution Engines$

    E-print Network

    Mitchell, David G.

    On the Power of Clause-Learning SAT Solvers as Resolution Engines$ Knot Pipatsrisawat,1 , Adnan from conflict-driven clause-learning SAT solvers and general resolution. Previous contributions on conflict-driven clause-learning SAT solvers corresponded to proof systems as powerful as general resolution

  1. Fusion Engineering and Design 38 (1997) 2757 Physics basis for a reversed shear tokamak power plant

    E-print Network

    California at San Diego, University of

    1997-01-01

    Fusion Engineering and Design 38 (1997) 27­57 Physics basis for a reversed shear tokamak power 92186, USA Abstract The reversed shear plasma configuration is examined as the basis for a tokamak reserved. Keywords: Reversed shear; Tokamak power plant; Plasma configuration 1. Introduction The reversed

  2. The Local Construction of the Asymmetrical Power Relationship in Teamwork among Engineers

    ERIC Educational Resources Information Center

    Vickers, Caroline H.

    2010-01-01

    The purpose of this article is to examine local, interactional processes associated with the construction of power asymmetries in collaborative teamwork among engineering students. To explore the construction of power asymmetries at the micro-interactional level, this article examines a corpus consisting of about 150,000 words in which seven teams…

  3. Apparatus for transmitting power obtained by converting the exhaust energy of an engine

    SciTech Connect

    Miyajima, H.

    1988-08-30

    This patent describes an apparatus for transmitting power obtained by converting the exhaust energy of a primary engine, the primary engine having a crank shaft and an exhaust passage for passing exhaust gas from the engine. The apparatus consists of: an output turbine having an output shaft and an intake port coupled to the exhaust passage; a compressor mounted on the output shaft of the turbine and including an outlet port; a rotary type engine having a double jointed trochoidal shaped rotor housing, the housing having an expansion chamber with an intake port and an outlet port and a compression chamber, the engine further comprising an eccentrically rotatable generally triangular shaped rotor mounted within the housing and a rotor shaft coupled to the rotor. The outlet port of the compressor is coupled to the intake port of the expansion chamber, the outlet port of the expansion chamber being coupled to the intake port of the output turbine; and power transmitting means connected between the crank shaft of the primary engine and the rotor shaft of the rotary engine whereby auxiliary power is provided to the primary engine.

  4. Kinematic Stirling engine as an energy conversion subsystem for paraboloidal dish solar thermal power plants

    SciTech Connect

    Bowyer, J.M.

    1984-04-15

    The potential of a suitably designed and economically manufactured Stirling engine as the energy conversion subsystem of a paraboloidal dish-Stirling solar thermal power module has been estimated. Results obtained by elementary cycle analyses have been shown to match quite well the performance characteristics of an advanced kinematic Stirling engine, the United Stirling P-40, as established by current prototypes of the engine and by a more sophisticated analytic model of its advanced derivative. In addition to performance, brief consideration has been given to other Stirling engine criteria such as durability, reliability, and serviceability. Production costs have not been considered here.

  5. High-performance diesel engines power high-speed hydrofoil catamaran

    SciTech Connect

    Not Available

    1994-10-01

    The speed of any sea-water craft is dependent on the design of its engine. Mitsubishi Heavy industries has developed a high-speed, fully submerged, super shuttle 400 hydrofoil catamaran ferry, which uses high-performance diesel engines to reach speeds up to 45 knots. The twin-hull design with V section forms permits the use of wide hydrofoils, allowing substantial lifting power. Each of the 16-cylinder engines has a maximum continuous output of 2100 kW at a maximum speed of 2000 r/min. Each catamaran section holds two engines driving a Mitsubishi MWJ-5000A waterjet through a combining reduction gear. 3 figs.

  6. Engineering design aspects of the heatpipe power system

    Microsoft Academic Search

    Brent Capell; Marc Berte

    1998-01-01

    The Heatpipe Power System (HPS) is a near-term, low-cost space fission power system designed at Los Alamos National Laboratory that can provide up to 1000 kWt for many space applications. The design of the reactor is simple, modular, and adaptable. The basic design allows for the use of a variety of power conversion systems and reactor materials (including the fuel,

  7. The performance of solar thermal electric power systems employing small heat engines

    NASA Astrophysics Data System (ADS)

    Pons, R. L.

    1980-02-01

    The paper presents a comparative analysis of small (10 to 100 KWe) heat engines for use with a solar thermal electric system employing the point-focusing, distributed receiver (PF-DR) concept. Stirling, Brayton, and Rankine cycle engines are evaluated for a nominal overall system power level of 1 MWe, although the concept is applicable to power levels up to at least 10 MWe. Multiple concentrators are electrically connected to achieve the desired plant output. Best performance is achieved with the Stirling engine, resulting in a system Levelized Busbar Energy Cost of just under 50 mills/kWH and a Capital Cost of $900/kW, based on the use of mass-produced components. Brayton and Rankine engines show somewhat less performance but are viable alternatives with particular benefits for special applications. All three engines show excellent performance for the small community application.

  8. GoEarth - performance and challenges of a semantic search engine for CCS literature

    NASA Astrophysics Data System (ADS)

    Gutknecht, B. D.; Alvers, M. R.

    2012-04-01

    Increased interests in climate sciences have led to exponentially increasing publication numbers regarding Carbon Capture and Storage (CCS). In order to be able to handle this overload of information, an ontology-based, semantic search system was developed. The used ontology was especially designed for geo-scientific content in CCS-literature. The semantic search engine provides users with an infrastructure that semantically categorizes textual content by facilitating natural language processing for the knowledge domain of CCS. The system works fully automated. So even search without keywords becomes possible and documents can be identified by navigating the ontology which is rendered as a tree on the left hand side of the search results. Furthermore, meta-data analysis provides useful statistical information, e.g. about author networks. Compared to the 1045 AGU index terms and the 3587 GeoRef thesaurus terms, the new CCS ontology (1170 concepts and synonyms) links to 11.0 % and 8.6 % more documents of a geo-scientific text corpus, respectively. Of all test documents, the CCS ontology hits 96.5 % (GeoRef: 88.9 %, AGU index terms: 87.1 %). We will discuss existing challenges like disambiguation of concepts and intelligent text mining.

  9. Evaluation of a Document Search Engine in a Clinical Department System

    PubMed Central

    Schulz, Stefan; Daumke, Philipp; Fischer, Pascal; Müller, Marcel

    2008-01-01

    MorphoSaurus, a concept-based document search engine, was incorporated into an EHR system in order to support search across the whole corpus of patient discharge letters and other clinically relevant documents. A user survey showed a general satisfaction with the system and revealed novel usages for information stored in discharge letters. The retrieval system was also used to identify relevant documents for a five-year retrospective survey of suspicious syphilis cases in the department. This retrieval scenario was used to assess the performance of MorphoSaurus against a manually created gold standard. A substring search for the German words “syphilis” and “lues” was used as baseline. The system yielded a precision p = 20.1% and a recall r = 100%. The values for the substring “syphilis” were p = 65.5% and r = 47.5%, for “lues” p = 15.4% and r = 87.7%. The results support the use of the proposed recall-oriented search across EHR documents to acquire valid and complete data for epidemiology studies in hospital populations. PMID:18999064

  10. 40 CFR 1042.140 - Maximum engine power, displacement, power density, and maximum in-use engine speed.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...cylinders. Calculate the engine's intended swept volume from the design specifications for the cylinders using enough significant figures to allow determination of the displacement to the nearest 0.02 liters. Determine the final value by...

  11. 40 CFR 1042.140 - Maximum engine power, displacement, power density, and maximum in-use engine speed.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...cylinders. Calculate the engine's intended swept volume from the design specifications for the cylinders using enough significant figures to allow determination of the displacement to the nearest 0.02 liters. Determine the final value by...

  12. Image content engine (ICE): a system for fast image database searches

    NASA Astrophysics Data System (ADS)

    Brase, James M.; Poland, Douglas N.; Paglieroni, David W.; Weinert, George F.; Grant, Charles W.; Lopez, Aseneth S.; Nikolaev, Sergei

    2005-05-01

    The Image Content Engine (ICE) is being developed to provide cueing assistance to human image analysts faced with increasingly large and intractable amounts of image data. The ICE architecture includes user configurable feature extraction pipelines which produce intermediate feature vector and match surface files which can then be accessed by interactive relational queries. Application of the feature extraction algorithms to large collections of images may be extremely time consuming and is launched as a batch job on a Linux cluster. The query interface accesses only the intermediate files and returns candidate hits nearly instantaneously. Queries may be posed for individual objects or collections. The query interface prompts the user for feedback, and applies relevance feedback algorithms to revise the feature vector weighting and focus on relevant search results. Examples of feature extraction and both model-based and search-by-example queries are presented.

  13. Image Content Engine (ICE): A System for Fast Image Database Searches

    SciTech Connect

    Brase, J M; Paglieroni, D W; Weinert, G F; Grant, C W; Lopez, A S; Nikolaev, S

    2005-03-22

    The Image Content Engine (ICE) is being developed to provide cueing assistance to human image analysts faced with increasingly large and intractable amounts of image data. The ICE architecture includes user configurable feature extraction pipelines which produce intermediate feature vector and match surface files which can then be accessed by interactive relational queries. Application of the feature extraction algorithms to large collections of images may be extremely time consuming and is launched as a batch job on a Linux cluster. The query interface accesses only the intermediate files and returns candidate hits nearly instantaneously. Queries may be posed for individual objects or collections. The query interface prompts the user for feedback, and applies relevance feedback algorithms to revise the feature vector weighting and focus on relevant search results. Examples of feature extraction and both model-based and search-by-example queries are presented.

  14. What is Focus? Focus is the TU/e Library's new search engine.

    E-print Network

    Franssen, Michael

    relevant to your subject (figure 1). Figure 1: advanced search: enter search terms as words from search boxes (figure 3). Figure 3: advanced search: enter search terms in specific search boxes #12;If tips If you are looking for publications on a subject: Type your search terms in the search box, e

  15. Free-piston Stirling engine conceptual design and technologies for space power, phase 1

    Microsoft Academic Search

    L. Barry Penswick; William T. Beale; J. Gary Wood

    1990-01-01

    As part of the SP-100 program, a phase 1 effort to design a free-piston Stirling engine (FPSE) for a space dynamic power conversion system was completed. SP-100 is a combined DOD\\/DOE\\/NASA program to develop nuclear power for space. This work was completed in the initial phases of the SP-100 program prior to the power conversion concept selection for the Ground

  16. Free-piston Stirling engine conceptual design and technologies for space power, Phase 1. Final Report

    Microsoft Academic Search

    L. B. Penswick; W. T. Beale; J. G. Wood

    1990-01-01

    As part of the SP-100 program, a phase 1 effort to design a free-piston Stirling engine (FPSE) for a space dynamic power conversion system was completed. SP-100 is a combined DOD\\/DOE\\/NASA program to develop nuclear power for space. This work was completed in the initial phases of the SP-100 program prior to the power conversion concept selection for the Ground

  17. Characterizing the time-perspective of nations with search engine query data.

    PubMed

    Noguchi, Takao; Stewart, Neil; Olivola, Christopher Y; Moat, Helen Susannah; Preis, Tobias

    2014-01-01

    Vast quantities of data on human behavior are being created by our everyday internet usage. Building upon a recent study by Preis, Moat, Stanley, and Bishop (2012), we used search engine query data to construct measures of the time-perspective of nations, and tested these measures against per-capita gross domestic product (GDP). The results indicate that nations with higher per-capita GDP are more focused on the future and less on the past, and that when these nations do focus on the past, it is more likely to be the distant past. These results demonstrate the viability of using nation-level data to build psychological constructs. PMID:24736725

  18. Optimizing power cylinder lubrication on a large bore natural gas engine

    NASA Astrophysics Data System (ADS)

    Luedeman, Matthew R.

    More than 6000 integral compressors, located along America's natural gas pipelines, pump natural gas across the United States. These compressors are powered by 2-stroke, large bore natural gas burning engines. Lowering the operating costs, reducing the emissions, and ensuring that these engines remain compliant with future emission regulations are the drivers for this study. Substantial research has focused on optimizing efficiency and reducing the fuel derived emissions on this class of engine. However, significantly less research has focused on the effect and reduction of lubricating oil derived emissions. This study evaluates the impact of power cylinder lubricating oil on overall engine emissions with an emphasis on reducing oxidation catalyst poisoning. A traditional power cylinder lubricator was analyzed; power cylinder lubricating oil was found to significantly impact exhaust emissions. Lubricating oil was identified as the primary contributor of particulate matter production in a large bore natural gas engine. The particulate matter was determined to be primarily organic carbon, and most likely direct oil carryover of small oil droplets. The particulate matter production equated to 25% of the injected oil at a nominal power cylinder lubrication rate. In addition, power cylinder friction is considered the primary contributor to friction loss in the internal combustion engine. This study investigates the potential for optimizing power cylinder lubrication by controlling power cylinder injection to occur at the optimal time in the piston cycle. By injecting oil directly into the ring pack, it is believed that emissions, catalyst poisoning, friction, and wear can all be reduced. This report outlines the design and theory of two electronically controlled lubrication systems. Experimental results and evaluation of one of the systems is included.

  19. CFD study on mean flow engine for wind power exploitation

    Microsoft Academic Search

    Yan Yu; Daming Sun; Ke Wu; Ya Xu; Haijun Chen; Xuejun Zhang; Limin Qiu

    2011-01-01

    Acoustic oscillation can be induced in a closed branch tube by a mean gas flow in a trunk tube passing the opening of the branch tube. Based on this principle, novel aerodynamically driven generator and thermoacoustic refrigerator can be manufactured. Large-eddy simulation (LES) of turbulence was applied to simulate aerodynamically driven acoustic oscillation in a mean flow engine (MFE) with

  20. The use of Stirling engines in combined cycle power plants

    Microsoft Academic Search

    G. Benvenuto; F. Farina

    1989-01-01

    Some novel ways to use a Stirling engine in connection with other energy conversion systems are presented and discussed. In particular, various arrangements in which a Stirling cycle is combined with other traditional cycles (diesel, Rankine, Brayton) are considered. The thermodynamic advantage arising from such cycle combinations is analytically investigated as a function of the most relevant parameters. The results

  1. Antiproton powered propulsion with magnetically confined plasma engines

    Microsoft Academic Search

    Lapointe

    1989-01-01

    Matter-antimatter annihilation releases more energy per unit mass than any other method of energy production, making it an attractive energy source for spacecraft propulsion. In the magnetically confined plasma engine, antiproton beams are injected axially into a pulsed magnetic mirror system, where they annihilate with an initially neutral hydrogen gas. The resulting charged annihilation products transfer energy to the hydrogen

  2. Electrical Engineering Aspects of the Enrico Fermi Atomic Power Plant

    Microsoft Academic Search

    Robert H. Logue

    1959-01-01

    The electrical engineering problems associated with the design of the ; Fermi Fast Breeder Reactor are discussed. Design considerations include the maln ; and emergency electric system, reactor control and instrumentation, electrical ; penetrations in the containment building, induction heating, and other equipment. ; (C.J G.)

  3. Search.com

    NSDL National Science Digital Library

    Search.com allows you to search over 800 engines, listed by subject areas from arts to Web. Each subject area presents a list of search forms, along with very brief annotations and "search tips." While there is no way to do a multiple engine search with a single command, the organization of Search.com allows the user to determine which engines might be appropriate. Search.com also allows you to set up a "personal" search page, based on subjects and searching engines chosen. Searching help is also provided, as is a "meta-search" to find useful engines before starting a search.

  4. Modeling of reciprocating internal combustion engines for power generation and heat recovery

    SciTech Connect

    Yun, Kyung Tae; Cho, Heejin; Luck, Rogelio; Mago, Pedro J.

    2013-02-01

    This paper presents a power generation and heat recovery model for reciprocating internal combustion engines (ICEs). The purpose of the proposed model is to provide realistic estimates of performance/efficiency maps for both electrical power output and useful thermal output for various capacities of engines for use in a preliminary CHP design/simulation process. The proposed model will serve as an alternative to constant engine efficiencies or empirical efficiency curves commonly used in the current literature for simulations of CHP systems. The engine performance/efficiency calculation algorithm has been coded to a publicly distributed FORTRAN Dynamic Link Library (DLL), and a user friendly tool has been developed using Visual Basic programming. Simulation results using the proposed model are validated against manufacturer’s technical data.

  5. Commercialization of coal diesel engines for non-utility and export power markets

    SciTech Connect

    Wilson, R.P.; Balles, E.N.; Rao, K.; Benedek, K.R.; Benson, C.E.; Mayville, R.A.; Itse, D.; Kimberley, J.; Parkinson, J.

    1993-11-01

    The basic motivation behind this project is to develop coal-burning heat engine technology primarily for 10-100 MW modular stationary power applications in the late 1990`s and beyond, when oil and gas prices may return to the $5--7/MMBtu range. The fuel is a low-cost, coal-based liquid with the consistency of black paint, composed of 12-micron mean size premium 2% ash coal dust mixed 50/50 with water. The Clean Coal Diesel Plant of the future is targeted for the 10-100 MW non-utility generation (NUG) and small utility markets, including independent power producers (IPP) and cogeneration. A family of plant designs will be offered using the Cooper-Bessemer 3.8, 5.0, and 6.3 MW Model LS engines as building blocks. In addition, larger plants will be configured with an engine in the 10-25 MW class (Cooper will license the technology to other large bore stationary engine manufacturers). The reciprocating engine offers a remarkable degree of flexibility in selecting plant capacity. This flexibility exists because the engines are modular in every sense (fuel cell stacks have similar modularity). Scale-up is accomplished simply by adding cylinders (e.g., 20 vs 16) or by adding engines (4 vs 3). There is no scale-up of the basic cylinder size. Thus, there is essentially no technical development needed to scale-up the Cooper-Bessemer Clean Coal Diesel Technology all the way from 2 MW (one 6-cylinder engine) to 50 MW (eight 20-cylinder engines), other than engineering adaptation of the turbocharger to match the engine.

  6. Discovery of gigantic molecular nanostructures using a flow reaction array as a search engine

    PubMed Central

    Zang, Hong-Ying; de la Oliva, Andreu Ruiz; Miras, Haralampos N.; Long, De-Liang; McBurney, Roy T.; Cronin, Leroy

    2014-01-01

    The discovery of gigantic molecular nanostructures like coordination and polyoxometalate clusters is extremely time-consuming since a vast combinatorial space needs to be searched, and even a systematic and exhaustive exploration of the available synthetic parameters relies on a great deal of serendipity. Here we present a synthetic methodology that combines a flow reaction array and algorithmic control to give a chemical ‘real-space’ search engine leading to the discovery and isolation of a range of new molecular nanoclusters based on [Mo2O2S2]2+-based building blocks with either fourfold (C4) or fivefold (C5) symmetry templates and linkers. This engine leads us to isolate six new nanoscale cluster compounds: 1, {Mo10(C5)}; 2, {Mo14(C4)4(C5)2}; 3, {Mo60(C4)10}; 4, {Mo48(C4)6}; 5, {Mo34(C4)4}; 6, {Mo18(C4)9}; in only 200 automated experiments from a parameter space spanning ~5 million possible combinations. PMID:24770632

  7. Characterizing Interdisciplinarity of Researchers and Research Topics Using Web Search Engines

    PubMed Central

    Sayama, Hiroki; Akaishi, Jin

    2012-01-01

    Researchers' networks have been subject to active modeling and analysis. Earlier literature mostly focused on citation or co-authorship networks reconstructed from annotated scientific publication databases, which have several limitations. Recently, general-purpose web search engines have also been utilized to collect information about social networks. Here we reconstructed, using web search engines, a network representing the relatedness of researchers to their peers as well as to various research topics. Relatedness between researchers and research topics was characterized by visibility boost—increase of a researcher's visibility by focusing on a particular topic. It was observed that researchers who had high visibility boosts by the same research topic tended to be close to each other in their network. We calculated correlations between visibility boosts by research topics and researchers' interdisciplinarity at the individual level (diversity of topics related to the researcher) and at the social level (his/her centrality in the researchers' network). We found that visibility boosts by certain research topics were positively correlated with researchers' individual-level interdisciplinarity despite their negative correlations with the general popularity of researchers. It was also found that visibility boosts by network-related topics had positive correlations with researchers' social-level interdisciplinarity. Research topics' correlations with researchers' individual- and social-level interdisciplinarities were found to be nearly independent from each other. These findings suggest that the notion of “interdisciplinarity" of a researcher should be understood as a multi-dimensional concept that should be evaluated using multiple assessment means. PMID:22719935

  8. Magnetohydrodynamics (MHD) Engineering Test Facility (ETF) 200 MWe power plant. Conceptual Design Engineering Report (CDER). Volume 1: Executive summary

    NASA Technical Reports Server (NTRS)

    1981-01-01

    Main elements of the design are identified and explained, and the rationale behind them was reviewed. Major systems and plant facilities are listed and discussed. Construction cost and schedule estimates are presented, and the engineering issues that should be reexamined are identified. The latest (1980-1981) information from the MHD technology program is integrated with the elements of a conventional steam power electric generating plant.

  9. Metor Search

    NSDL National Science Digital Library

    Here is another metasearch engine worth a spin. In addition to the typical choices of search engines and directories, Metor Search also offers specialized searching by nineteen additional categories, including cars, downloads, news, games, recipes, and travel, among others. Some of these only index a few engines, but in each, users have the option to select specific engines and set a timeout span. Search returns, which include a short description culled from the page, appeared to be fairly relevant in test runs.

  10. Use of Internal Coolant as a Means of Permitting Increase in Engine Take-Off Power

    NASA Technical Reports Server (NTRS)

    Rothrock, Addison M

    1944-01-01

    Engine tests, together with estimates made at Langley Memorial Aeronautical Laboratory, indicate that a 25-percent increase in take-off power can be obtained with present-day aircraft engines without increasing either the knock limit of the fuel or the external cooling requirements of the engine. This increase in power with present fuels and present external cooling is made possible through the use of an internal coolant inducted through the inlet manifold. Estimates on aircraft indicate that this 25-percent increase in power will permit an approximate usable increase of 8.5 percent in the take-off load of existing military airplanes. This increase in load is equivalent to an increase in the weight of gasoline normally carried of between 30 and 65 percent.

  11. 40 CFR 1054.140 - What is my engine's maximum engine power and displacement?

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...cylinders. Calculate the engine's intended swept volume from the design specifications for the cylinders using enough significant figures to allow determination of the displacement to the nearest 0.1 cc. Determine the final value by rounding...

  12. SPIKE2: A practical Stirling engine for kilowatt level solar power

    Microsoft Academic Search

    W. T. Beale

    1984-01-01

    Recent advances in the art of free piston Stirling engine design make possible the production of 1-10kW free piston Stirling linear alternator engine, hermetically sealed, efficient, durable and simple in construction and operation. Power output is in the form of single or three phase 60 Hz. AC, or DC. The three phase capability is available from single machines without need

  13. Experimental study on mechanical power generation from MEMS internal combustion engine

    Microsoft Academic Search

    Yu Suzuki; Yasuhiro Okada; Jyunji Ogawa; Susumu Sugiyama; Toshiyuki Toriyama

    2008-01-01

    A micro-electro-mechanical-system internal combustion engine (MEMS IC engine) is fabricated to demonstrate the energy conversion from heat to mechanical power. The dimensions and surface-to-volume ratio of combustion chamber are 5mm×3mm×1mm (0.015cc) and 3.07mm?1, respectively. The reciprocation motion of a piston can be sustained by the force balance between combustion pressure and the repulsion force of an elastic spring. A premixture

  14. UMCP-BG and E collaboration in nuclear power engineering in the framework of DOE-Utility Nuclear Power Engineering Education Matching Grant Program

    SciTech Connect

    Wolfe, Lothar PhD

    2000-03-01

    The DOE-Utility Nuclear Power Engineering Education Matching Grant Program has been established to support the education of students in Nuclear Engineering Programs to maintain a knowledgeable workforce in the United States in order to keep nuclear power as a viable component in a mix of energy sources for the country. The involvement of the utility industry ensures that this grant program satisfies the needs and requirements of local nuclear energy producers and at the same time establishes a strong linkage between education and day-to-day nuclear power generation. As of 1997, seventeen pairs of university-utility partners existed. UMCP was never a member of that group of universities, but applied for the first time with a proposal to Baltimore Gas and Electric Company in January 1999 [1]. This proposal was generously granted by BG&E [2,3] in the form of a gift in the amount of $25,000 from BG&E's Corporate Contribution Program. Upon the arrival of a newly appointed Director of Administration in the Department of Materials and Nuclear Engineering, the BG&E check was deposited into the University's Maryland Foundation Fund. The receipt of the letter and the check enabled UMCP to apply for DOE's matching funds in the same amount by a proposal.

  15. A Low-Power All-Digital Phase-Locked Loop Using Binary Frequency Searching

    Microsoft Academic Search

    Chua-Chin Wang; Tzung-Je Lee; Sheng-Lun Tseng

    We propose a low power ADPLL (All-digital phase-locked loop) by using a controller which employs a bi- nary frequency searching method in this paper. Glitch hazards and timing violations which occurred very often in the prior ADPLL designs are avoided by the control method and the modified DCO (Digital-controlled oscillator) with multiplexers. The proposed design is implemented by only using

  16. Ultra Clean 1.1MW High Efficiency Natural Gas Engine Powered System

    SciTech Connect

    Zurlo, James; Lueck, Steve

    2011-08-31

    Dresser, Inc. (GE Energy, Waukesha gas engines) will develop, test, demonstrate, and commercialize a 1.1 Megawatt (MW) natural gas fueled combined heat and power reciprocating engine powered package. This package will feature a total efficiency > 75% and ultra low CARB permitting emissions. Our modular design will cover the 1 – 6 MW size range, and this scalable technology can be used in both smaller and larger engine powered CHP packages. To further advance one of the key advantages of reciprocating engines, the engine, generator and CHP package will be optimized for low initial and operating costs. Dresser, Inc. will leverage the knowledge gained in the DOE - ARES program. Dresser, Inc. will work with commercial, regulatory, and government entities to help break down barriers to wider deployment of CHP. The outcome of this project will be a commercially successful 1.1 MW CHP package with high electrical and total efficiency that will significantly reduce emissions compared to the current central power plant paradigm. Principal objectives by phases for Budget Period 1 include: • Phase 1 – market study to determine optimum system performance, target first cost, lifecycle cost, and creation of a detailed product specification. • Phase 2 – Refinement of the Waukesha CHP system design concepts, identification of critical characteristics, initial evaluation of technical solutions, and risk mitigation plans. Background

  17. ATS-6 engineering performance report. Volume 3: Telecommunications and power

    NASA Technical Reports Server (NTRS)

    Wales, R. O. (editor)

    1981-01-01

    Functional design requirements and in-orbit operations, performance, and anomalies are discussed for (1) the communications subsystem, (2) the electrical power system, and (3) the telemetry and command subsystem. The latter includes a review of ground support. Tracking and data relay experiments and the Apollo-Soyuz test program are reviewed.

  18. Design of a new discharge power supply for ion engine

    Microsoft Academic Search

    Hiroshi Nagano; Kenichi Kajiwara; Hiroyuki Osuga; Toshiyuki Ozaki; Kazuo Shuto

    2010-01-01

    JAXA has researched the Super Low Altitude Test Satellite (SLATS) for next generation earth observing satellite. We started research and development of a new IES in order to apply for the SLATS program. In this paper, we describe the preliminary design results of the IES configuration plan for the SLATS, performance requirements of the power processing control unit (PPCU) and

  19. Optical Power Source Derived from Engine Combustion Chambers

    NASA Technical Reports Server (NTRS)

    Baumbick, Robert J. (Inventor)

    1999-01-01

    An optical power source is disclosed that collects the spectra of the light emissions created in a combustion chamber to provide its optical output signals that serve the needs of optical networks. The light spectra is collected by a collection ring serving as an optical waveguide.

  20. The Expressive Power of UML-based Web Engineering1

    Microsoft Academic Search

    NORA KOCH; ANDREAS KRAUS

    2002-01-01

    this article we show the power of this approach. On the one hand, UWE prescribes how to buildnavigation and presentation models for Web applications defining therefore special UML stereotyped modelingelements and tagged values. On the other hand, we show how these Web specific navigation and presentationmodels can be supplemented by other views using the variety of UML diagram types and

  1. Theta13 Neutrino Experiment at the Diablo Canyon Power Plant, LBNL Engineering Summary Report

    SciTech Connect

    Oshatz, Daryl

    2004-03-12

    This summary document describes the results of conceptual design and cost estimates performed by LBNL Engineering staff between October 10, 2003 and March 12, 2004 for the proposed {theta}{sub 13} neutrino experiment at the Diablo Canyon Power Plant (DCPP). This document focuses on the detector room design concept and mechanical engineering issues associated with the neutrino detector structures. Every effort has been made not to duplicate information contained in the last LBNL Engineering Summary Report dated October 10, 2003. Only new or updated information is included in this document.

  2. Effect of using of IEEJ (Power and Energy) Technical Papers on Engineering Education

    NASA Astrophysics Data System (ADS)

    Shirakawa, Shingo

    The IEEJ has published useful papers for electric power and energy systems. These papers published in IEEJ transactions contribute to special engineers to receive the doctor degree or understand newly developed technologies etc. But, it is very important to know the impression of young students about IEEJ transactions papers considering the technology transfer. This paper describes reaction comments of next generation university students under learning engineering of design and drawing of power equipments in 2009 after the Lehman Shock (the Lehman Brothers' worldwide economical collapse dated Sept. 15 2008).

  3. MetaSEEk: A Content-Based Meta-Search Engine for Images Mandis Beigi, Ana B. Benitez, and Shih-Fu Chang*

    E-print Network

    Chang, Shih-Fu

    -search engine used for finding images on the Web based on their visual information. MetaSEEk is designed' information needs for newspaper articles, software, movie reviews, books, music recording, images, video, etcMetaSEEk: A Content-Based Meta-Search Engine for Images Mandis Beigi, Ana B. Benitez, and Shih

  4. Exploiting Browsing History for Exploratory Search

    Microsoft Academic Search

    Wei-lin Chen; Wei-guang Teng

    2009-01-01

    With the advance of information technologies, web search has become a necessary activity for most Internet users. Although\\u000a current search engines are powerful enough to respond required search results in seconds, information seekers may still feel\\u000a arduous to digest them when conducting the exploratory search. In other words, when users are unfamiliar with the domain of\\u000a their goals or unsure

  5. Mechanical engineers' handbook, energy and power. 3rd ed.

    SciTech Connect

    Myer Kutz (ed.)

    2005-12-15

    In addition to chapters on thermophysical properties of fluids, fundamentals of fluid mechanics, thermodynamics, heat transfer, combustion, and furnaces, Book 4 of the Handbook features coverage of both conventional (gaseous and liquid fuels, coal, and nuclear) and alternative (solar, geothermal, and fuel cells) energy sources, plus chapters on power machinery, refrigeration and cryogenics, environmental issues, and thermal systems optimization. Much of the material in this book is new or extensively revised, including coverage of such topics as: Heat pipes; Wind turbines; Fuel cells; Thermal systems optimization; Combustion; Fans, blowers, compressors, and pumps; Indoor environmental control; and Fluid power. Chapters of particular interest are: Combustion by Eric Eddings; Furnaces by Carroll Cone; Gaseous fuels by Richard J. Reed; Coals, lignite, peat by James Keppeler; and Air pollution-control technologies by C.A. Miller.

  6. A low-power acoustic periodicity detector chip for voice and engine detection

    Microsoft Academic Search

    Hisham Abdalla; Timothy Horiuchi

    2003-01-01

    The detection of voices or the rumble of engines is a desirable function in many different devices from toys to smart homes to military applications. Typical approaches involving frequency-domain computation are quite computationally intensive and require a significant power and computational budget. In an effort to construct a very low-power detector capable of acting as a wake-up signal for other

  7. Control scheme for power modulation of a free piston Stirling engine

    DOEpatents

    Dhar, Manmohan (Schenectady, NY)

    1989-01-01

    The present invention relates to a control scheme for power modulation of a free-piston Stirling engine-linear alternator power generator system. The present invention includes connecting an autotransformer in series with a tuning capacitance between a linear alternator and a utility grid to maintain a constant displacement to piston stroke ratio and their relative phase angle over a wide range of operating conditions.

  8. DESIGN AND TEST OF SMALL-SCALE ROTARY ENGINE POWER SYSTEM

    Microsoft Academic Search

    Yisheng Liu; Wei Li; Canjun Yang; Ruiyin Song

    2007-01-01

    In order to develop a portable, autonomous power generation system with a magnitude improvement in energy density over alkaline or lithium-ion batteries, the liquid hydrocarbons fueled small-scale rotary (Wankel-type) internal combustion engines project is directed toward the development of a practical small-scale power generator. Micro combustion and seal are two of the most prominent questions of the design of small-scale

  9. Hybrid pneumatic-power system which recycles exhaust gas of an internal-combustion engine

    Microsoft Academic Search

    K. David Huang; Sheng-Chung Tzeng; Wei-Ping Ma; Wei-Chuan Chang

    2005-01-01

    The hybrid pneumatic power system (HPPS) proposed in this research replaces the battery’s electric-chemical energy with flow work and optimizes the management and utilization of the energy. This power system is able to keep the internal-combustion engine working at its optimal condition and turn its waste energy into effective mechanical energy and so enhance the thermal efficiency of the whole

  10. Human Factors Engineering Review Model for advanced nuclear power reactors

    SciTech Connect

    O'Hara, J.; Higgins, J. (Brookhaven National Lab., Upton, NY (United States)); Goodman, C.; Galletti, G.: Eckenrode, R. (Nuclear Regulatory Commission, Rockville, MD (United States))

    1993-01-01

    One of the major issues to emerge from the initial design reviews under the certification process was that detailed human-systems interface (HSI) design information was not available for staff review. To address the lack of design detail issue. The Nuclear Regulatory Commission (NRC) is performing the design certification reviews based on a design process plan which describes the human factors engineering (HFE) program elements that are necessary and sufficient to develop an acceptable detailed design specification. Since the review of a design process is unprecedented in the nuclear industry. The criteria for review are not addressed by current regulations or guidance documents and. therefore, had to be developed. Thus, an HFE Program Review Model was developed. This paper will describe the model's rationale, scope, objectives, development, general characteristics. and application.

  11. Human Factors Engineering Review Model for advanced nuclear power reactors

    SciTech Connect

    O`Hara, J.; Higgins, J. [Brookhaven National Lab., Upton, NY (United States); Goodman, C.; Galletti, G.: Eckenrode, R. [Nuclear Regulatory Commission, Rockville, MD (United States)

    1993-05-01

    One of the major issues to emerge from the initial design reviews under the certification process was that detailed human-systems interface (HSI) design information was not available for staff review. To address the lack of design detail issue. The Nuclear Regulatory Commission (NRC) is performing the design certification reviews based on a design process plan which describes the human factors engineering (HFE) program elements that are necessary and sufficient to develop an acceptable detailed design specification. Since the review of a design process is unprecedented in the nuclear industry. The criteria for review are not addressed by current regulations or guidance documents and. therefore, had to be developed. Thus, an HFE Program Review Model was developed. This paper will describe the model`s rationale, scope, objectives, development, general characteristics. and application.

  12. Stirling engine power control and motion conversion mechanism

    DOEpatents

    Marks, David T. (Birmingham, MI)

    1983-01-01

    A motion conversion device for converting between the reciprocating motion of the pistons in a Stirling engine and the rotating motion of its output shaft, and for changing the stroke and phase of the pistons, includes a lever pivoted at one end and having a cam follower at the other end. The piston rod engages the lever intermediate its ends and the cam follower engages a cam keyed to the output shaft. The lever pivot can be moved to change the length of the moment arm defined between the cam follower and the piston rod the change the piston stroke and force exerted on the cam, and the levers can be moved in opposite directions to change the phase between pistons.

  13. Aerodynamic Heat-Power Engine Operating on a Closed Cycle

    NASA Technical Reports Server (NTRS)

    Ackeret, J.; Keller, D. C.

    1942-01-01

    Hot-air engines with dynamic compressors and turbines offer new prospects of success through utilization of units of high efficiencies and through the employment of modern materials of great strength at high temperature. Particular consideration is given to an aerodynamic prime mover operating on a closed circuit and heated externally. Increase of the pressure level of the circulating air permits a great increase of limit load of the unit. This also affords a possibility of regulation for which the internal efficiency of the unit changes but slightly. The effect of pressure and temperature losses is investigated. A general discussion is given of the experimental installation operating at the Escher Wyss plant in Zurich for a considerable time at high temperatures.

  14. Stirling engine power control and motion conversion mechanism

    SciTech Connect

    Marks, D.T.

    1983-07-12

    A motion conversion device for converting between the reciprocating motion of the pistons in a Stirling engine and the rotating motion of its output shaft, and for changing the stroke and phase of the pistons, includes a lever pivoted at one end and having a cam follower at the other end. The piston rod engages the lever intermediate its ends and the cam follower engages a cam keyed to the output shaft. The lever pivot can be moved to change the length of the moment arm defined between the cam follower and the piston rod the change the piston stroke and force exerted on the cam, and the levers can be moved in opposite directions to change the phase between pistons. 3 figs.

  15. Collaboration To Teach the Critical Thinking Skills Needed To Become a Successful Internet Searcher: The Planning of a WWW Search Engine Workshop.

    ERIC Educational Resources Information Center

    Cook, Douglas

    2000-01-01

    Describes a collaborative workshop designed by the Associated College Libraries of Central Pennsylvania to identify and teach World Wide Web search skills to librarians. Highlights include how information get on the Web and is indexed; evaluation of Web resources; types of search sites; and which search engine is the best. (Author/LRW)

  16. Free-piston Stirling engine system considerations for various space power applications

    SciTech Connect

    Dochat, G.R.; Dhar, M. (Mechanical Technology Incorporated, 968 Albany-Shaker Road, Latham, New York 12110 (US))

    1991-01-05

    The U.S. Government is evaluating power requirements for future space applications. As power requirements increase solar or nuclear dynamic systems become increasingly attractive. Free-Piston Stirling Engines (FPSE) have the potential to provide high reliability, long life, and efficient operation. Therefore, they are excellent candidates for the dynamic power conversion module of a space-based, power-generating system. FPSE can be coupled with many potential heat sources (radioisotope, solar, or nuclear reactor), various heat input systems (pumped loop, heat pipe), heat rejection (pumped loop or heat pipe), and various power management and distribution systems (AC, DC, high or low voltage, and fixed or variable load). This paper will review potential space missions that can be met using free-piston Stirling engines and discusses options of various system integration approaches. Currently free-piston Stirling engine technology for space power applications is being developed under contract with NASA-Lewis Research Center. This paper will also briefly outline the program and recent progress.

  17. Overview of free-piston Stirling engine technology for space power application

    SciTech Connect

    Slaby, J.G.

    1987-01-01

    An overview is presented of the National Aeronautics and Space Administration (NASA) Lewis Research Center (LeRC) free-piston Stirling engine activities directed toward space-power application. One of the major elements of the program is the development of advanced power conversion of which the Stirling cycle is a viable candidate. Under this program the status of the 25 kWe opposed-piston Space Power Demonstrator Engine (SPDE) is presented. Technology work is also conducted on heat-exchanger concepts, both design and fabrication, to minimize the number of joints as well as to enhance the heat transfer in the heater. Design parameters and conceptual design features are also presented for a 25 kWe, single-cylinder free-piston Stirling space-power converter. Projections are made for future space-power requirements over the next few decades along with a recommendation to consider the use of dynamic power-conversion systems - either solar or nuclear. A description of a study to investigate the feasibility of scaling a single-cylinder free-piston Stirling space-power module to the 150 kWe power range is presented.

  18. DBXplorer: A System for Keyword-Based Search over Relational Databases

    Microsoft Academic Search

    Sanjay Agrawal; Surajit Chaudhuri; Gautam Das

    2002-01-01

    Internet search engines have popularized the keyword- based search paradigm. While traditional database management systems offer powerful query languages, they do not allow keyword-based search. In this paper, we discuss DBXplorer, a system that enables keyword- based search in relational databases. DBXplorer has been implemented using a commercial relational database and web server and allows users to interact via a

  19. The search for ‘uniform and equable motion’ A study of the early methods of control of the steam engine

    Microsoft Academic Search

    S. BENNETT

    1975-01-01

    The methods used during the eighteenth century to regulate the power output of the steam engine are examined. Both open and closed loop systems are considered ; these include load regulation, engine stroke length and frequency control, boiler water level and pressure control, uses of energy storage devices—fly-wheel, accumulator—and the flyball or Watt governor. It is shown that although some

  20. Search Adobe PDF Online

    NSDL National Science Digital Library

    According to Adobe, their search engine indexes over one million .pdf documents. The interface is clean and simple: a keyword search powered by AltaVista. Initial returns are listed with a brief description and a link to the full entry, which includes a summary, the title, author, date, size, estimated download time for a 56kbps modem, and of course, a link to the full text in .pdf format.