Note: This page contains sample records for the topic powerful search engines from Science.gov.
While these samples are representative of the content of Science.gov,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of Science.gov
to obtain the most current and comprehensive results.
Last update: August 15, 2014.
1

Search Engines  

Microsoft Academic Search

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

Rustam Al-Shahi

2001-01-01

2

Meta Search Engines.  

ERIC Educational Resources Information Center

Describes common options and features to consider in evaluating which meta search engine will best meet a searcher's needs. Discusses number and names of engines searched; other sources and specialty engines; search queries; other search options; and results options. (AEF)

Garman, Nancy

1999-01-01

3

Image Semantic Search Engine  

Microsoft Academic Search

As the search technology rapidly developed, nowadays, main search engines are already able to meet users basic search desire. However, current search algorithms or methodologies mostly depend on keywords matching process, which could be effective for text search while not efficient for keywords-lacking or non-text search scenarios. This paper summarizes the solution adopted by current search engine vendors, and introduces

Lv Chaoqing; Takashi Kobayashi; Kiyoshi Agusa; Kun Wu; Qing Zhu

2009-01-01

4

Modeling search engine effectiveness for federated search  

Microsoft Academic Search

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

Luo Si; Jamie Callan

2005-01-01

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

Searches Conducted for Engineers.  

ERIC Educational Resources Information Center

This paper reports an industrial information specialist's experience in performing online searches for engineers and surveys the databases used. Engineers seeking assistance fall into three categories: (1) those who recognize the value of online retrieval; (2) referrals by colleagues; and (3) those who do not seek help. As more successful searches

Lorenz, Patricia

7

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.

8

Improving Search Engine Reliability  

NASA Astrophysics Data System (ADS)

Search engines on the Internet are used daily to access and find information. While these services are providing an easy way to find information globally, they are also suffering from artificially created false results. This paper describes two techniques that are being used to manipulate the search engines: spam pages (used to achieve higher rankings on the result page) and cloaking (used to feed falsified data into search engines). This paper also describes two proposed methods to fight this kind of misuse, algorithms for both of the formerly mentioned cases of spamdexing.

Pruthi, Jyoti; Kumar, Ela

2010-11-01

9

High-Speed and Low-Power Network Search Engine Using Adaptive Block-Selection Scheme  

Microsoft Academic Search

A new approach for using block-selection scheme to increase the search throughput of multi-block TCAM-based network search engines is proposed. While the existing methods try to counter and forcibly balance the inherent bias of the Internet traffic, our method takes advantage of it. Our method improves flexibility of table management and gains scalability towards high rates of change in traffic

Mohammad J. Akhbarizadeh; Mehrdad Nourani; Rina Panigrahy

2005-01-01

10

Measuring Search Engine Quality  

Microsoft Academic Search

The effectiveness of twenty public search engines is evaluated using TREC-inspired methodsand a set of 54 queries taken from real Web search logs. The World Wide Web is taken as thetest collection and a combination of crawler and text retrieval system is evaluated. The enginesare compared on a range of measures derivable from binary relevance judgments of the firstseven live

David Hawking; Nick Craswell; Peter Bailey; Kathleen Griffiths

2001-01-01

11

Structural Web Search Engine  

Microsoft Academic Search

We present a new approach in web search engines. The web creates new challenges for information retrieval. The vast improvement in information access is not the only advantage resulting from the keyword search. Ad- ditionally, much potential exists for analyzing interests and relationships within the structure of the web. The creation of a hyperlink by the author of a web

Arash Rakhshan; Lawrence B. Holder; Diane J. Cook

2003-01-01

12

A Keyword Searching Algorithm For Search Engines  

Microsoft Academic Search

Search engines prominently use inverted indexing technique to locate the Web pages having the keyword contained in the users query. The performance of inverted index, fundamentally, depends upon the searching of keyword in the list maintained by search engines. This paper presents a new technique for keyword searching. It uses a trie data structure to index the keyword up to

Vishal Gupta

2007-01-01

13

Web Search Engines: Search Syntax and Features.  

ERIC Educational Resources Information Center

Presents a chart that explains the search syntax, features, and commands used by the 12 most widely used general Web search engines. Discusses Web standardization, expanded types of content searched, size of databases, and search engines that include both simple and advanced versions. (LRW)

Ojala, Marydee

2002-01-01

14

Inktomi Search Engine  

NSDL National Science Digital Library

The Inktomi search engine at the University of California at Berkeley offers a large database of indexed Web documents and "scalable web server" technology providing very fast search retrievals. Inktomi's simple search interface uses "+" as its MUST operator and "-" as its NOT operator. Relevance of the retrieval is ranked by how many of the words are used on the retrieved page, and by the relative importance of those words, although how this importance is determined is not revealed. Inktomi's database upgrade on December 29, 1995 made 2.8 million documents available for searching.

1998-01-01

15

Search Engines: Terrorism's Killer App  

Microsoft Academic Search

This article investigates whether a relationship exists between the number of fatalities caused by a terrorist group and the number of websites returned via the Google search engine when a search for the group is conducted. It is hypothesized that search engines’ algorithms facilitate such an association, and search engines’ role as the Web's “gatekeeper.” Much attention has been paid

Victor Asal; Paul Harwood

2008-01-01

16

Search-based software engineering  

Microsoft Academic Search

This paper claims that a new field of Software Engineering research and practice is emerging: Search-Based Software Engineering. The paper argues that Software Engineering is ideal for the application of metaheuristic search techniques, such as genetic algorithms, simulated annealing and tabu search. Such search-based techniques could provide solutions to the difficult problems of balancing competing (and sometimes inconsistent) constraints and

Mark Harman; Bryan F. Jones

2001-01-01

17

Search Engine Colossus: International Directory of Search Engines  

NSDL National Science Digital Library

Created by Bryan Strome, this metasite offers links to a large number of country- or region-specific search engines. The search engines are organized by country, with a link to the service, the language(s) it uses, its point of origin, and a short description when available. The number of search engines available under each heading can vary considerably, as would be expected. Search engines in eleven general categories, including Academic, Business, Medical, and Sports, are also listed. Users wishing to narrow their searches and/or utilize some lesser-known search engines will find this site a helpful starting point.

Strome, Bryan A.

18

Power law scaling for the adiabatic algorithm for search engine ranking  

NASA Astrophysics Data System (ADS)

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.

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

2013-03-01

19

Search Engine Liability for Copyright Infringement  

NASA Astrophysics Data System (ADS)

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.

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

20

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

NASA Astrophysics Data System (ADS)

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.

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

2013-09-01

21

Search Engine Marketing: Transforming Search Engines into Hotel Distribution Channels  

Microsoft Academic Search

Search engine marketing (SEM) is a form of online marketing whereby marketers and webmasters use a range of techniques to ensure that their webpage listing appears in a favorable location in search engines’ results pages (e.g., Google, Bing, AlltheWeb, Altavista). The key strategy is to optimize webpages for the search engines, by ensuring that the company’s webpages contain appropriate keywords

Alexandros Paraskevas; Ioannis Katsogridakis; Rob Law; Dimitrios Buhalis

2011-01-01

22

Assessing Bias in Search Engines.  

ERIC Educational Resources Information Center

Addresses the measurement of bias in search engines on the Web, defining bias as the balance and representation of items in a collection retrieved from a database for a set of queries. Assesses bias by measuring the deviation from the ideal of the distribution produced by a particular search engine. (Author/LRW)

Mowshowitz, Abbe; Kawaguchi, Akira

2002-01-01

23

Yahoo! Debuts New Search Engine  

NSDL National Science Digital Library

In 1996 Yahoo! enhanced its search interface to help users more quickly reach the Internet resources they need. Searches return a summary page, which presents hits in four categories: Yahoo Categories, Web Sites, Net Events (from the Yahoo Net Events site) and News (from Reuters, PR Newswire, Business Wire, and UPI). If a search comes up empty in these four categories, it will be referred to the Alta Vista search engine for an Internet-wide search. In addition, search results are now presented in order of relevance (as determined by the search engine, which may have a fairly sketchy grasp on what the user really wants) rather than alphabetically, though the user can choose an alphabetical list instead. An advanced search page allows limited Boolean operation, searching of particular Yahoo! resources, a time frame for listings, and how many matches to display per page.

1996-01-01

24

Ripple-Precharge TCAM A Low-Power Solution for Network Search Engines  

Microsoft Academic Search

A novel low power ripple-precharge Ternary CAM (RP- TCAM) architecture is proposed for applications in longest pre- fix matching tasks. The main motivation behind this research is to reduce the dynamic power consumption in TCAM due to fre- quent charging and discharging of the highly capacitive match line. This issue is addressed by exploiting the fact that when we compare

Deepak S. Vijayasarathi; Mehrdad Nourani; Mohammad J. Akhbarizadeh; Poras T. Balsara

2005-01-01

25

Web Search Studies: Multidisciplinary Perspectives on Web Search Engines  

NASA Astrophysics Data System (ADS)

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.

Zimmer, Michael

26

Pumped storage for hydroelectric power. (Latest citations from Fluidex (Fluid Engineering Abstracts) database). Published Search  

SciTech Connect

The bibliography contains citations concerning the design, development, construction, and characteristics of surface and underground pumped storage for hydroelectric power. Pumped storage projects and facilities worldwide are referenced. There is some consideration of research and experimental results of pumped storage studies, as well as modeling. (Contains a minimum of 198 citations and includes a subject term index and title list.)

Not Available

1993-10-01

27

Search Engine Optimization: SEO Book  

NSDL National Science Digital Library

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.

Wall, Aaron

2007-07-14

28

Impact of search engines on page popularity  

Microsoft Academic Search

Recent studies show that a majority of Web page accesses are referred by search engines. In this paper we study the widespread use of Web search engines and its impact on the ecology of the Web. In particular, we study how much impact search engines have on the popularity evolution of Web pages. For example, given that search engines return

Junghoo Cho; Sourashis Roy

2004-01-01

29

Start Your Engines: Surfing with Search Engines for Kids.  

ERIC Educational Resources Information Center

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)

Byerly, Greg; Brodie, Carolyn S.

1999-01-01

30

Assessing bias in search engines  

Microsoft Academic Search

This paper deals with the measurement of bias in search engines on the World Wide Web. Bias is taken to mean the balance and representativeness of items in a collection retrieved from a database for a set of queries. This calls for assessing the degree to which the distribution of items in a collection deviates from the ideal. Ascertaining this

Abbe Mowshowitz; Akira Kawaguchi

2002-01-01

31

Federated search of text search engines in uncooperative environments  

Microsoft Academic Search

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

Luo Si

2007-01-01

32

Characterizing and predicting search engine switching behavior  

Microsoft Academic Search

Search engine switching describes the voluntarily transition from one Web search engine to another. In this paper we present a study of search engine switching behavior that combines large- scale log-based analysis and survey data. We characterize aspects of switching behavior, and develop and evaluate predictive mod- els of switching behavior using features of the active query, the current session,

Ryen W. White; Susan T. Dumais

2009-01-01

33

On caching search engine query results  

Microsoft Academic Search

In this paper we explore the problem of Caching of Search Engine Query Results in order to reduce the computing and I\\/O requirements needed to support the functionality of a search engine of the World Wide Web.We study query traces from the EXCITE search engine and show that they have a significant amount of temporal locality that is, a significant

Evangelos P. Markatos

2001-01-01

34

Quantum searching application in search based software engineering  

NASA Astrophysics Data System (ADS)

The Search Based Software Engineering (SBSE) is widely used in software engineering for identifying optimal solutions. However, there is no polynomial-time complexity solution used in the traditional algorithms for SBSE, and that causes the cost very high. In this paper, we analyze and compare several quantum search algorithms that could be applied for SBSE: quantum adiabatic evolution searching algorithm, fixed-point quantum search (FPQS), quantum walks, and a rapid modified Grover quantum searching method. The Grover's algorithm is thought as the best choice for a large-scaled unstructured data searching and theoretically it can be applicable to any search-space structure and any type of searching problems.

Wu, Nan; Song, FangMin; Li, Xiangdong

2013-05-01

35

NASA Indexing Benchmarks: Evaluating Text Search Engines  

NASA Technical Reports Server (NTRS)

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.

Esler, Sandra L.; Nelson, Michael L.

1997-01-01

36

The Country Music Search Engine  

NSDL National Science Digital Library

Garth Brooks fans, hold on to your hats! The Country Music Search Engine offers a full spectrum of country music news and information. Featured on the site is the enormous Country Music Directory, a database of all things related to country music including Websites for individual singers or groups, news links and online publications, associations, and sheet music and lyrics. The directory seems to be geared more towards mainstream country music: a search for Shania Twain rendered 242 hits while "Robbie Fulks" pulled up just one Web resource. The Website also contains a listing of the top 40 Websites as ranked by visitors to the site, and links to country events, MP3s, and album reviews.

37

Search Engines: Gateway to a New ``Panopticon''?  

NASA Astrophysics Data System (ADS)

Nowadays, Internet users are depending on various search engines in order to be able to find requested information on the Web. Although most users feel that they are and remain anonymous when they place their search queries, reality proves otherwise. The increasing importance of search engines for the location of the desired information on the Internet usually leads to considerable inroads into the privacy of users. The scope of this paper is to study the main privacy issues with regard to search engines, such as the anonymisation of search logs and their retention period, and to examine the applicability of the European data protection legislation to non-EU search engine providers. Ixquick, a privacy-friendly meta search engine will be presented as an alternative to privacy intrusive existing practices of search engines.

Kosta, Eleni; Kalloniatis, Christos; Mitrou, Lilian; Kavakli, Evangelia

38

Exploiting web search engines to search structured databases  

Microsoft Academic Search

Web search engines often federate many user queries to rel- evant structured databases. For example, a product related query might be federated to a product database containing their descriptions and specications. The relevant struc- tured data items are then returned to the user along with web search results. However, each structured database is searched in isolation. Hence, the search often

Sanjay Agrawal; Kaushik Chakrabarti; Surajit Chaudhuri; Venkatesh Ganti; Arnd Christian König; Dong Xin

2009-01-01

39

Search Engines for the World Wide Web  

Microsoft Academic Search

Search engines are defined” and recent developments described, exemplified, and evaluated, especially those concerned with traditional search and retrieval capabilities. Discussion concentrates on two broad issues: (1.) collection and indexing methods and (2) retrieval and ranking methods. It is concluded that a wider adoption of field searching, proximity searching, and relevance feedback would improve quality of search results.

Sarah J. Clarke

2000-01-01

40

Search Engines that Learn from Implicit Feedback  

Microsoft Academic Search

Search-engine logs provide a wealth of information that machine-learning techniques can harness to improve search quality. With proper interpretations that avoid inherent biases, a search engine can use training data extracted from the logs to automatically tailor ranking functions to a particular user group or collection.

Thorsten Joachims; Filip Radlinski

2007-01-01

41

Collaborative personalization on medical search engines using user exploratory survey  

Microsoft Academic Search

The surge of medical search engines in the web space is irrepressible. Medical search engines contain concise, structured and accurate information. As a result, medical search engines do not return cornucopia of search results to users. Search results returned by medical search engines are limited but relevant to a users query. Albeit a newcomer to the web, medical search engines

Anushia Inthiran; Saadat M. Alhashmi; Pervaiz K. Ahmed

2010-01-01

42

PyThinSearch: A Simple Web Search Engine  

Microsoft Academic Search

We describe a simple, functioning Web search engine for indexing and searching online documents using Python programming language. Python was chosen because it is an elegant language with simple syntax, is easy to learn and debug, and supports main operating systems almost evenly. The remarkable characteristics of this program are an adjustable search function that allows users to rank documents

Andri Mirzal

2009-01-01

43

ReSEARCH: A Requirements Search Engine.  

National Technical Information Service (NTIS)

This research address three closely related problems. (1) Most current search technology is based on a popularity metric (e.g., PageRank or ExpertRank), but not on the semantic content of the document. (2) When building components in a service-oriented ar...

C. Martell G. Gehrke P. Anand P. H. Adams R. Gera

2008-01-01

44

Web impact factors and search engine coverage  

Microsoft Academic Search

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

Mike Thelwall

2000-01-01

45

Fully automatic wrapper generation for search engines  

Microsoft Academic Search

When a query is submitted to a search engine, the search engine returns a dynamically generated result page containing the result records, each of which usually consists of a link to and\\/or snippet of a retrieved Web page. In addition, such a result page often also contains information irrelevant to the query, such as information related to the hosting site

Hongkun Zhao; Weiyi Meng; Zonghuan Wu; Vijay Raghavan; Clement T. Yu

2005-01-01

46

Subject Gateway Sites and Search Engine Ranking.  

ERIC Educational Resources Information Center

Discusses subject gateway sites and commercial search engines for the Web and presents an explanation of Google's PageRank algorithm. The principle question addressed is the conditions under which a gateway site will increase the likelihood that a target page is found in search engines. (LRW)

Thelwall, Mike

2002-01-01

47

BioText Search Engine: beyond abstract search.  

PubMed

The BioText Search Engine is a freely available Web-based application that provides biologists with new ways to access the scientific literature. One novel feature is the ability to search and browse article figures and their captions. A grid view juxtaposes many different figures associated with the same keywords, providing new insight into the literature. An abstract/title search and list view shows at a glance many of the figures associated with each article. The interface is carefully designed according to usability principles and techniques. The search engine is a work in progress, and more functionality will be added over time. Availability: http://biosearch.berkeley.edu. PMID:17545178

Hearst, Marti A; Divoli, Anna; Guturu, Harendra; Ksikes, Alex; Nakov, Preslav; Wooldridge, Michael A; Ye, Jerry

2007-08-15

48

Inquirus, the NECI Meta Search Engine  

Microsoft Academic Search

World Wide Web (WWW) search engines (e.g. AltaVista, Infoseek, HotBot, etc.) have a number of deficiencies including: periods of downtime, low coverage of the WWW, inconsistent and inefficient user interfaces, out of date databases, poor relevancy ranking and precision, and difficulties with spamming techniques. Meta search engines have been introduced which address some of these and other difficulties in searching

Steve Lawrence; C. Lee Giles

1998-01-01

49

NASA indexing benchmarks: evaluating text search engines  

Microsoft Academic Search

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 tool-kit capable of automatically indexing,

Sandra L. Esler; Michael L. Nelson

1997-01-01

50

World Wide Web Image Search Engines  

Microsoft Academic Search

We propose the development of a world wide web image search engine that crawls the web collecting information about the images it finds, computes the appropriate image decompositions and indices, and stores this extracted infor- mation for searches based on image content. Indexing and searching images need not require solving the image under- standing problem. Instead, the general approach should

Stan Sclaroff

1995-01-01

51

Distributed Search Engine for an IaaS Based Cloud  

Microsoft Academic Search

Cloud based online storage enables the storage of massive data. In these systems, a full text search engine is very important for finding documents. In this paper, we propose a distributed search engine suitable for searching a cloud. In our previous work, we developed a distributed search engine, the cooperative search engine (CSE). We now extend the CSE to search

Yuuta Ichikawa; Minoru Uehara

2011-01-01

52

Using Advanced Search Operators on Web Search Engines.  

ERIC Educational Resources Information Center

Studies show that the majority of Web searchers enter extremely simple queries, so a reasonable system design approach would be to build search engines to compensate for this user characteristic. One hundred representative queries were selected from the transaction log of a major Web search service. These 100 queries were then modified using the…

Jansen, Bernard J.

53

BioText Search Engine: beyond abstract search  

Microsoft Academic Search

Summary: The BioText Search Engine is a freely available Web-based application that provides biologists with new ways to access the scientific literature. One novel feature is the ability to search and browse article figures and their captions. A grid view juxtaposes many different figures associated with the same keywords, providing new insight into the literature. An abstract\\/title search and list

Marti A. Hearst; Anna Divoli; Harendra Guturu; Alex Ksikes; Preslav Nakov; Michael A. Wooldridge; Jerry Ye

2007-01-01

54

Towards Automatic Incorporation of Search Engines into a Large-Scale Metasearch Engine  

Microsoft Academic Search

A metasearch engine supports unified access to multiple component search engines. To build a very large-scale metasearch engine that can access up to hundreds of thousands of component search engines, one major challenge is to incorporate large numbers of autonomous search engines in a highly effective manner. To solve this problem, we propose automatic search engine discovery, automatic search engine

Zonghuan Wu; Vijay Raghavan; Hua Qian; Vuyyuru Rama; Weiyi Meng; Hai He; Clement T. Yu

2003-01-01

55

PARADISE Based Search Engine at TREC 2009 Web Track.  

National Technical Information Service (NTIS)

In this paper, we introduce the PARADISE search engine in TREC09 Web track. PARADISE is the abbreviation for Platform for Applying, Research and Developing Intelligent Search Engine, which is a search engine platform developed by SEWM group, Peking Univer...

D. Shan D. Zhao H. Yan J. He

2009-01-01

56

Search Engines Tackle the Desktop  

Microsoft Academic Search

As PC hard drives get bigger and new information sources become available, users will have much more data of different types, including multimedia, on their computers. This makes it increasingly difficult to find documents, e-mail messages, spreadsheets, audio clips, and other files. Current desktop-based search capabilities, such as those in Windows, are inadequate to meet this challenge. Desktop search features

Bernard Cole

2005-01-01

57

The egalitarian effect of search engines  

Microsoft Academic Search

Search engines have become key media for our scientific, economic, and social\\u000aactivities by enabling people to access information on the Web in spite of its\\u000asize and complexity. On the down side, search engines bias the traffic of users\\u000aaccording to their page-ranking strategies, and some have argued that they\\u000acreate a vicious cycle that amplifies the dominance of

Santo Fortunato; Alessandro Flammini; Filippo Menczer; Alessandro Vespignani

2005-01-01

58

Clinician Search Behaviors May Be Influenced by Search Engine Design  

PubMed Central

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.

Coiera, Enrico; Zrimec, Tatjana; Compton, Paul

2010-01-01

59

Keyword Generation for Search Engine Advertising  

Microsoft Academic Search

Keyword3 generation for search engine advertising is an important problem for sponsored search or paid- placement advertising. A recent strategy in this area is bidding on nonobvious yet relevant words, which are economically more viable. Targeting many such nonobvious words lowers the advertising cost, while delivering the same click volume as expensive words. Generating the right nonobvious yet relevant keywords

Amruta Joshi; Rajeev Motwani

2006-01-01

60

A search engine for 3D models  

Microsoft Academic Search

As the number of 3D models available on the Web grows, there is an increasing need for a search engine to help people find them. Unfortunately, traditional text-based search techniques are not always effective for 3D data. In this article, we investigate new shape-based search methods. The key challenges are to develop query methods simple enough for novice users and

Thomas A. Funkhouser; Patrick Min; Michael M. Kazhdan; Joyce Chen; Alex Halderman; David P. Dobkin; David Pokrass Jacobs

2003-01-01

61

A Search Engine for 3D Models  

Microsoft Academic Search

As the number of 3D models available on the Web grows, there is an increasing need for a search engine to help people find them. Unfortunately, traditional text-based search techniques are not always effective for 3D data. In this paper, we investigate new shape-based search methods. The key challenges are to develop query methods simple enough for novice users and

Thomas Funkhouser; Patrick Min; Misha Kazhdan; Joyce Chen; Alex Halderman; David Dobkin; David Jacobs

2002-01-01

62

Meta Search Engine for Searching Multiple Human Rights Sites  

NSDL National Science Digital Library

Recently unveiled by the Human Rights Library of the University of Minnesota (originally reviewed in the January 5, 1996 Scout Report), this new search engine will be welcomed by researchers and activists in human rights. Searchable by keyword and several optional operators (Boolean, proximity, truncation), the engine retrieves data from any or all of the 23 different rights-related sites that users select. Interestingly, returns are presented "as is" from the source pages (with page header, images, and unique formats) but combined into a single results page. A test search for "Northern Ireland" on four selected sites returned over 40 results. Direct links to the featured databases and, in some cases, their search tips pages are also provided.

63

Specialized Search Engines: Alternatives to the Big Guys.  

ERIC Educational Resources Information Center

Discusses specialized search engines for information on specific topics on the Internet. Explains reasons for using specialized search engines; highlights search engines in the fields of health care, legal information, and multimedia formats; and provides Web sites that are helpful in finding other specialized search engines. (LRW)

King, David

2000-01-01

64

MetaSEEk: A Content-Based Meta-Search Engine for Images  

Microsoft Academic Search

Search engines are the most powerful resources for finding information on the rapidly expanding World Wide Web (WWW). Finding the desired search engines and learning how to use them, however, can be very time consuming. The integration of such search tools enables the users to access information across the world in a transparent and efficient manner. These systems are called

Mandis Beigi; Ana B. Benitez; Shih-Fu Chang

1997-01-01

65

Evidence-based Medicine Search: a customizable federated search engine  

PubMed Central

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.

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

2008-01-01

66

A distributed mobile agent based Web search for adaptive meta search engines  

Microsoft Academic Search

In this paper, the problems of current Web search engines are analyzed, and the need for a new design is justified. Some ideas on how to improve current Web search engines are presented, and then an adaptive method for Web meta-search engines with a multi-agent specially the mobile agents is presented to make search engines work more efficiently. In the

M. Koorangi; K. Zamanifar

2005-01-01

67

Físréal: A Low Cost Terabyte Search Engine  

Microsoft Academic Search

In this poster we describe the development of a distributed search engine, referred to as Físréal, which utilises inexpensive workstations, yet attains fast retrieval performance for Terabyte-sized collections. We also discuss the process of leveraging additional meaning from the structure of HTML, as well as the use of anchor text documents to increase retrieval performance.

Paul Ferguson; Cathal Gurrin; Peter Wilkins; Alan F. Smeaton

2005-01-01

68

Research Trends with Cross Tabulation Search Engine  

ERIC Educational Resources Information Center

To help researchers in building a knowledge foundation of their research fields which could be a time-consuming process, the authors have developed a Cross Tabulation Search Engine (CTSE). Its purpose is to assist researchers in 1) conducting research surveys, 2) efficiently and effectively retrieving information (such as important researchers,…

Yin, Chengjiu; Hirokawa, Sachio; Yau, Jane Yin-Kim; Hashimoto, Kiyota; Tabata, Yoshiyuki; Nakatoh, Tetsuya

2013-01-01

69

Clustering user queries of a search engine  

Microsoft Academic Search

In order to increase retrieval precision, some new search engines provide manually verified answers to Frequently Asked Queries (FAQs). An underlying task is the identification of FAQs. This paper describes our attempt to cluster similar queries according to their contents as well as user logs. Our preliminary results show that the resulting clusters provide useful information for FAQ identification.

Ji-Rong Wen; Jian-Yun Nie; Hong-Jiang Zhang

2001-01-01

70

Inverted files for text search engines  

Microsoft Academic Search

The technology underlying text search engines has advanced dramatically in the past decade. The development of a family of new index representations has led to a wide range of innovations in index storage, index construction, and query evaluation. While some of these developments have been consolidated in textbooks, many specific techniques are not widely known or the textbook descriptions are

Justin Zobel; Alistair Moffat

2006-01-01

71

XSEarch: A Semantic Search Engine for XML  

Microsoft Academic Search

XSEarch, a semantic search engine for XML, is presented. XSEarch has a simple query lan- guage, suitable for a naive user. It returns se- mantically related document fragments that satisfy the user's query. Query answers are ranked using extended information-retrieval techniques and are generated in an order sim- ilar to the ranking. Advanced indexing tech- niques were developed to facilitate

Sara Cohen; Jonathan Mamou; Yaron Kanza; Yehoshua Sagiv

2003-01-01

72

Chemical-text hybrid search engines.  

PubMed

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

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

2010-01-01

73

The Use of Web Search Engines in Information Science Research.  

ERIC Educational Resources Information Center

Reviews the literature on the use of Web search engines in information science research, including: ways users interact with Web search engines; social aspects of searching; structure and dynamic nature of the Web; link analysis; other bibliometric applications; characterizing information on the Web; search engine evaluation and improvement; and…

Bar-Ilan, Judit

2004-01-01

74

Mining User preference using Spy voting for search engine personalization  

Microsoft Academic Search

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

Ng Wilfred; Lin Deng; Dik Lun Lee

2007-01-01

75

How are we searching the World Wide Web? A comparison of nine search engine transaction logs  

Microsoft Academic Search

The Web and especially major Web search engines are essential tools in the quest to locate online information for many people. This paper reports results from research that examines characteristics and changes in Web searching from nine studies of five Web search engines based in the US and Europe. We compare interactions occurring between users and Web search engines from

Bernard J. Jansen; Amanda Spink

2006-01-01

76

NPSE: A High Performance Network Packet Search Engine  

Microsoft Academic Search

This paper describes the NPSE, a high-performance SRAM-based network packet search engine which has the primary application of supporting IPv4 and IPv6 forwarding. It is based on a high-speed hardware implementation of a tree-based storage and retrieval algorithm, which is memory and power-efficient compared to traditional CAM-based look-up methods.

Naresh Soni; Nick Richardson; Lun-Bin Huang; Suresh Rajgopal; George Vlantis

2003-01-01

77

(Nuclear power engineering in space)  

SciTech Connect

The principal purpose of this trip was to participate in the Anniversary Specialist Conference on Nuclear Power Engineering in Space hosted by the USSR Ministry of Atomic Power Engineering and Industry. The conference was held in Obninsk, USSR. A secondary purpose of the trip was to meet with the French Commissariat A L'Energie Atomique in Paris regarding the status of their space power program.

Cooper, R.H. Jr.

1990-06-18

78

Agglomerative clustering of a search engine query log  

Microsoft Academic Search

This paper introduces a technique for mining a collection ofuser transactions with an Internet search engine to discoverclusters of similar queries and similar URLs. The informationwe exploit is "clickthrough data": each record consistsof a user's query to a search engine along with the URLwhich the user selected from among the candidates offeredby the search engine. By viewing this dataset as

Doug Beeferman; Adam L. Berger

2000-01-01

79

Taming the Information Jungle with WWW Search Engines.  

ERIC Educational Resources Information Center

Because searching the Web with different engines often produces different results, the best strategy is to learn how each engine works. Discusses comparing search engines; qualities to consider (ease of use, relevance of hits, and speed); and six of the most popular search tools (Yahoo, Magellan. InfoSeek, Alta Vista, Lycos, and Excite). Lists…

Repman, Judi; And Others

1997-01-01

80

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

Microsoft Academic Search

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

Adele E. Howe; Daniel Dreilinger

1997-01-01

81

iMed: An Intelligent Medical Web Search Engine  

Microsoft Academic Search

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

Gang Luo

82

OncoSearch: cancer gene search engine with literature evidence.  

PubMed

In order to identify genes that are involved in oncogenesis and to understand how such genes affect cancers, abnormal gene expressions in cancers are actively studied. For an efficient access to the results of such studies that are reported in biomedical literature, the relevant information is accumulated via text-mining tools and made available through the Web. However, current Web tools are not yet tailored enough to allow queries that specify how a cancer changes along with the change in gene expression level, which is an important piece of information to understand an involved gene's role in cancer progression or regression. OncoSearch is a Web-based engine that searches Medline abstracts for sentences that mention gene expression changes in cancers, with queries that specify (i) whether a gene expression level is up-regulated or down-regulated, (ii) whether a certain type of cancer progresses or regresses along with such gene expression change and (iii) the expected role of the gene in the cancer. OncoSearch is available through http://oncosearch.biopathway.org. PMID:24813447

Lee, Hee-Jin; Dang, Tien Cuong; Lee, Hyunju; Park, Jong C

2014-07-01

83

Powerful New Engine.  

National Technical Information Service (NTIS)

Through Small Business Innovation Research (SBIR) funding from NASA's Glenn Research Center, Moller International created a new coating for rotary engines, which significantly improves the fuel consumption of a vehicle while reducing emissions. The new co...

2001-01-01

84

Desktop search in the intranet with integrated desktop search engines  

Microsoft Academic Search

The desktop search is a technology more and more popular in computer experience. A desktop search software, like Google desktop search, could offer us a quick service for searching information by building sorted index for the files, images, and other catalogs. But for enterprise, it is not enough only to search in local computer. Sometimes the useful information like meeting

Wei Lun Huang; Tzao Lin Lee; Chiao Szu Liao

2008-01-01

85

Applying Elementary Landscape Analysis to Search-Based Software Engineering  

Microsoft Academic Search

Recent research in search-based software engineering (SBSE) has demonstrated that a number of software engineering problems can be reformulated as a search problem, hence search algorithms can be applied to tackle it. However, most of the existing work has been of empirical nature and the techniques are predominately experimental. Therefore in-depth studies into characteritics of SE problems and appropriate algorithms

Guanzhou Lu; Rami Bahsoon; Xin Yao

2010-01-01

86

Progress in Documentation: The Evaluation of WWW Search Engines.  

ERIC Educational Resources Information Center

Reviews the literature on Web search engines evaluation, with the aim of identifying some of the issues and problems in this rapidly changing field. Suggests that a standardized set of tools be developed for the evaluation of search engines so comparisons can be made between them more effectively and variations in performance of any given search

Oppenheim, C.; Morris, A.; McKnight, C.; Lowley, S.

2000-01-01

87

Predictive caching and prefetching of query results in search engines  

Microsoft Academic Search

We study the caching of query result pages in Web search engines. Popular search engines receive millions of queries per day, and efficient policies for caching query results may enable them to lower their response time and reduce their hardware requirements. We present PDC (probability driven cache), a novel scheme tailored for caching search results, that is based on a

Ronny Lempel; Shlomo Moran

2003-01-01

88

Query Recommendation Using Query Logs in Search Engines  

Microsoft Academic Search

In this paper we propose a method that, given a query sub- mitted to a search engine, suggests a list of related queries. The related queries can be issued by the user to the search engine to tune or redirect the search process. The method proposed is based on a query clustering process in which groups of semantically similar queries

Ricardo A. Baeza-yates; Carlos A. Hurtado; Marcelo Mendoza

2004-01-01

89

Ocean Engineering Power Systems.  

National Technical Information Service (NTIS)

The text presents the basic thermodynamic principles and considerations necessary for the understanding of power systems in the ocean environment. These are illustrated by the development of specific application examples thereby presented the theory in a ...

A. D. Carmichael

1974-01-01

90

Dynamics of Search Engine Rankings - A Case Study  

Microsoft Academic Search

The objective of this study was to characterize the changes in the rankings of the top-n results of major search engines over time and to compare the rankings between these engines. We considered only the top-ten results, since users usually inspect only the first page returned by the search engine, which normally contains ten results. In particular, we compare rankings

Judit Bar-Ilan; Mark Levene; Mazlita Mat-Hassan

91

Toward two-dimensional search engines  

NASA Astrophysics Data System (ADS)

We study the statistical properties of various directed networks using ranking of their nodes based on the dominant vectors of the Google matrix known as PageRank and CheiRank. On average PageRank orders nodes proportionally to a number of ingoing links, while CheiRank orders nodes proportionally to a number of outgoing links. In this way, the ranking of nodes becomes two dimensional which paves the way for the development of two-dimensional search engines of a new type. Statistical properties of information flow on the PageRank-CheiRank plane are analyzed for networks of British, French and Italian universities, Wikipedia, Linux Kernel, gene regulation and other networks. A special emphasis is done for British universities networks using the large database publicly available in the UK. Methods of spam links control are also analyzed.

Ermann, L.; Chepelianskii, A. D.; Shepelyansky, D. L.

2012-07-01

92

Cancer Internet Search Activity on a Major Search Engine, United States 2001-2003  

PubMed Central

Background To locate online health information, Internet users typically use a search engine, such as Yahoo! or Google. We studied Yahoo! search activity related to the 23 most common cancers in the United States. Objective The objective was to test three potential correlates of Yahoo! cancer search activity—estimated cancer incidence, estimated cancer mortality, and the volume of cancer news coverage—and to study the periodicity of and peaks in Yahoo! cancer search activity. Methods Yahoo! cancer search activity was obtained from a proprietary database called the Yahoo! Buzz Index. The American Cancer Society's estimates of cancer incidence and mortality were used. News reports associated with specific cancer types were identified using the LexisNexis “US News” database, which includes more than 400 national and regional newspapers and a variety of newswire services. Results The Yahoo! search activity associated with specific cancers correlated with their estimated incidence (Spearman rank correlation, ? = 0.50, P = .015), estimated mortality (? = 0.66, P = .001), and volume of related news coverage (? = 0.88, P < .001). Yahoo! cancer search activity tended to be higher on weekdays and during national cancer awareness months but lower during summer months; cancer news coverage also tended to follow these trends. Sharp increases in Yahoo! search activity scores from one day to the next appeared to be associated with increases in relevant news coverage. Conclusions Media coverage appears to play a powerful role in prompting online searches for cancer information. Internet search activity offers an innovative tool for passive surveillance of health information–seeking behavior.

Cooper, Crystale Purvis; Mallon, Kenneth P; Leadbetter, Steven; Peipins, Lucy A

2005-01-01

93

Flow based clustering algorithm for tourism search engine  

Microsoft Academic Search

This paper introduces a flow based clustering algorithm for tourism search engine. Unlike the general tourism search engines such as www.tripadvisor.com, www.qunar.com and www.kayak.com etc. to return the users' queries huge amount of web page links, this algorithm helps the tourism search engine create a list of words which serve as suggestions to expand and update the users' queries. It

Liu Jie; Du Junping; Sun Zengqi; Jia Yingming

2010-01-01

94

ProFusion*: Intelligent Fusion from Multiple, Distributed Search Engines  

Microsoft Academic Search

The explosive growth of the World Wide Web, and the resulting information overload, has led to a mini-explosion in World Wide Web search engines. This mini-explosion, in turn, led to the development of ProFusion, a meta search engine. Educators, like other users, do not have the time to evaluate multiple search engines to knowledgeably select the best for their uses.

Susan Gauch; Guijun Wang; Mario Gomez

1996-01-01

95

Building Domain-Specific Search Engines with Machine Learning Techniques  

Microsoft Academic Search

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

Andrew McCallum; Kamal Nigam; Jason Rennie; Kristie Seymore

1999-01-01

96

The Never-Ending Quest: Search Engine Relevance.  

ERIC Educational Resources Information Center

Discusses relevance in search engines for the World Wide Web. Highlights include types of searches submitted; database scope; how organizations position their Web sites; link analysis; spelling errors; offering alternatives to queries; and the single-answer approach. (LRW)

Notess, Greg R.

2000-01-01

97

Comparative evaluation of Web image search engines for multimedia applications  

Microsoft Academic Search

While text-oriented document searching are relatively mature on the Internet, image searching, which requires much more than text matching, significantly lags behind. The use of image search engines significantly enlarges the scope of images to users accessibility. This paper provides an understanding of current technologies in image searching on the Internet, and points to future areas of improvement for multimedia

Keon Stevenson; Clement Leung

2005-01-01

98

Power control for heat engines  

DOEpatents

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.

Dineen, John J. (Durham, NH)

1984-01-01

99

Study of a Quantum Framework for Search Based Software Engineering  

NASA Astrophysics Data System (ADS)

The Search Based Software Engineering (SBSE) is widely used in the software engineering to identify optimal solutions. The traditional methods and algorithms used in SBSE are criticized due to their high costs. In this paper, we propose a rapid modified-Grover quantum searching method for SBSE, and theoretically this method can be applied to any search-space structure and any type of searching problems.

Wu, Nan; Song, Fangmin; Li, Xiangdong

2013-06-01

100

Web Feet Guide to Search Engines: Finding It on the Net.  

ERIC Educational Resources Information Center

This guide to search engines for the World Wide Web discusses selecting the right search engine; interpreting search results; major search engines; online tutorials and guides; search engines for kids; specialized search tools for various subjects; and other specialized engines and gateways. (LRW)

Web Feet, 2001

2001-01-01

101

Theoretical Runtime Analysis in Search Based Software Engineering  

Microsoft Academic Search

Search algorithms have been used to tackle software engineering problems with promising results. Although the field has attracted a lot of attention recently, it still lacks a theoretical foundation. It has been empirically shown that search algorithms are successful in some software engineering tasks, but we need to understand why and when they are successful. The long term goal is

Andrea Arcuri; Per Kristian Lehre; Xin Yao

102

Scalable federated search engine using Z39.50 protocol  

Microsoft Academic Search

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

Alexandre Khokhlov

103

Combining Website Search Engine Optimization with Advanced Web Log Analysis  

Microsoft Academic Search

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

Seamus Dromey; Ciara Heavin; Karen Neville

2005-01-01

104

Topical interests and the mitigation of search engine bias  

Microsoft Academic Search

Search engines have become key media for our scientific, economic, and social activities by enabling people to access information on the web despite its size and complexity. On the down side, search engines bias the traffic of users according to their page ranking strategies, and it has been argued that they create a vicious cycle that amplifies the dominance of

S. Fortunato; A. Flammini; F. Menczer; A. Vespignani

2006-01-01

105

The relationship between search based software engineering and predictive modeling  

Microsoft Academic Search

Search Based Software Engineering (SBSE) is an approach to software engineering in which search based optimization algorithms are used to identify optimal or near optimal solutions and to yield insight. SBSE techniques can cater for multiple, possibly competing objectives and\\/ or constraints and applications where the potential solution space is large and complex. This paper will provide a brief overview

Mark Harman

2010-01-01

106

Methods for Measuring Search Engine Performance over Time.  

ERIC Educational Resources Information Center

Introduces methods for evaluating Web search engine performance over a time period. Describes the necessary setup for such studies, illustrates the use of these measures through a specific example, and recommends the use of the measures as a guideline for testing and improving search engine functionality. (Author/LRW)

Bar-Ilan, Judit

2002-01-01

107

Locality in Search Engine Queries and Its Implications for Caching  

Microsoft Academic Search

Caching is a popular technique for reducing both server load and user response time in dis- tributed systems. In this paper, we are interested in the question of whether caching might be effective for search engines as well. We study two real search engine traces by examining query locality and its implications for caching. Our trace analysis results show that:

Yinglian Xie; David R. O'hallaron

2002-01-01

108

Microprocessors in fluid power engineering  

SciTech Connect

Microprocessors and digital electronics may well take over most control functions in engineering and will also open up many new possibilities. This IMechE conference provided a forum of engineers to discuss the state of the technology. Subjects covered include: analogue valves and hydraulic controls; transducers; use of microprocessors in off-line processing activities; and the use of microprocessors in closed loop processing. Papers include a review of the application of microprocessors to electrohydraulic control systems; test rig control; a low cost microprocessor to fluid power interface valve; micro-electronics in flowmeters and other transducers; on-line monitoring of mining hydraulic systems; and computer controlled pneumatic servo drives.

Not Available

1984-01-01

109

Bibliographical Meta Search Engine for the Retrieval of Scientific Articles  

Microsoft Academic Search

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

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

2007-01-01

110

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

ERIC Educational Resources Information Center

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.…

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

111

Harmony Search Algorithms in Structural Engineering  

Microsoft Academic Search

\\u000a Harmony search method is widely applied in structural design optimization since its emergence. These applications have shown\\u000a that harmony search algorithm is robust, effective and reliable optimization method. Within recent years several enhancements\\u000a are suggested to improve the performance of the algorithm. Among these Mahdavi has presented two versions of harmony search\\u000a methods. He named these as improved harmony search

M. P. Saka; I. Aydogdu; O. Hasancebi; Z. W. Geem

112

Topical interests and the mitigation of search engine bias  

PubMed Central

Search engines have become key media for our scientific, economic, and social activities by enabling people to access information on the web despite its size and complexity. On the down side, search engines bias the traffic of users according to their page ranking strategies, and it has been argued that they create a vicious cycle that amplifies the dominance of established and already popular sites. This bias could lead to a dangerous monopoly of information. We show that, contrary to intuition, empirical data do not support this conclusion; popular sites receive far less traffic than predicted. We discuss a model that accurately predicts traffic data patterns by taking into consideration the topical interests of users and their searching behavior in addition to the way search engines rank pages. The heterogeneity of user interests explains the observed mitigation of search engines’ popularity bias.

Fortunato, S.; Flammini, A.; Menczer, F.; Vespignani, A.

2006-01-01

113

Sponsored Search Engines in Competition: Advertisers Behavior and Engines Optimal Ranking Strategies  

Microsoft Academic Search

Search engines are essential actors for web browsing. We analyze here the economic competition between search engines earning money from adword auctions. We develop a two- level game where at the largest time scale search engines decide which allocation rule to implement, between revenue-based and bid-based; and at the lowest time-scale advertisers decide how to split their advertising budget between

Patrick Maille; Bruno Tuffin

2011-01-01

114

An Analysis of Internet Search Engines: Assessment of Over 200 Search Queries.  

ERIC Educational Resources Information Center

Describes a study of the retrieval results of World Wide Web search engines. Research quantified accurate matches versus matches of arguable quality for 200 subjects relevant to undergraduate curricula. Both "evaluative" engines (Magellan, Point Communications) and "nonevaluative" engines (Lycos, InfoSeek, AltaVista) were examined. Taking into…

Tomaiuolo, Nicholas G.; Packer, Joan G.

1996-01-01

115

A method to assess search engine results  

Microsoft Academic Search

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

Judit Bar-Ilan; Mark Levene

2011-01-01

116

Search Engine for Federal Standard 1037C. NTIA Report Series.  

National Technical Information Service (NTIS)

Federal Standard 1037C, Glossary of Telecommunication Terms, contains more than 5800 entries defining the components of several disciplines in telecommunications technology. Use of this large glossary is enhanced with the search engine designed specifical...

W. J. Ingram E. M. Gray

1999-01-01

117

Transporting submarine engines to power the PRT  

NASA Technical Reports Server (NTRS)

The city of Hampton was unable to supply adequate electric power to operate the PRT. Navy Captain Walter S. Diehl, Bureau of Aeronautics, acquired two 1000 hp submarine engines which were to be disposed of. BuAer 'loaned' the engines to the NACA, one of which is shown here. Next to the engine is Donald H. Wood, a mechanical engineer from Rensselaer Polytechnic Institute and Fred Weick's assistant. Propeller Research Tunnel (PRT) engineer Donald H. Wood ponders the unlikely transfer of a submarine engine from rail car to NACA truck, May 1926. Two such diesel engines powered the PRT.

1926-01-01

118

Personalized Search Based on a User-Centered Recommender Engine  

Microsoft Academic Search

Designing personalized search engines based on a recommender system that takes into consideration the user situated moment in relation to the subject matter and the context that governs user interest has been largely ignored. In this paper, we present a novel approach to integrating user interests into search within a recommender system that is guided by the semantic representation of

Leyla Zhuhadar; Olfa Nasraoui

2010-01-01

119

Research on Social Network Based on Meta-search Engine  

Microsoft Academic Search

In order to solve the problem that we can only collect data from one single data source at some fixed time after mining the keywords in a rather superficial level, and to take full use of the information returned by search engines to construct the social relationship network based on the semantic link of the searched subject, we do the

Shen Yang; Liu Zi-tao; Luo Cheng; Li Ye

2009-01-01

120

Image and Video Search Engine for the World Wide Web  

Microsoft Academic Search

We describe a visual information system prototype for searching for images and videos on the WorldWide Web. New visual information in the form of images, graphics, animations and videos is being published on the Web at an incredible rate. However, cataloging this visual data is beyond the capabilities of current text-based Web search engines. In this paper, we describe a

John R. Smith; Shih-Fu Chang

1997-01-01

121

Analysis of a very large web search engine query log  

Microsoft Academic Search

In this paper we present an analysis of an AltaVista Search Engine query log consisting of approximately 1 billion entries for search requests over a period of six weeks. This represents almost 285 million user sessions, each an attempt to fill a single information need. We present an analysis of individual queries, query duplication, and query sessions. We also present

Craig Silverstein; Hannes Marais; Monika Henzinger; Michael Moricz

1999-01-01

122

The SPIRIT Spatial Search Engine: Architecture, Ontologies and Spatial Indexing  

Microsoft Academic Search

The SPIRIT search engine provides a test bed for the de- velopment of web search technology that is specialised for access to ge- ographical information. Major components include the user interface, geographical ontology, maintenance and retrieval functions for a test col- lection of web documents, textual and spatial indexes, relevance ranking and metadata extraction. Here we summarise the functionality and

Christopher B. Jones; Alia I. Abdelmoty; David Finch; Gaihua Fu; Subodh Vaid

2004-01-01

123

Paying Your Way to the Top: Search Engine Advertising.  

ERIC Educational Resources Information Center

Explains how organizations can buy listings on major Web search engines, making it the fastest growing form of advertising. Highlights include two network models, Google and Overture; bidding on phrases to buy as links to use with ads; ad ranking; benefits for small businesses; and paid listings versus regular search results. (LRW)

Scott, David M.

2003-01-01

124

Agora: A Search Engine for Software Components.  

National Technical Information Service (NTIS)

Agora is a software prototype being developed by the Commercial Off the Shelf (COTS) Based Systems Initiative at the Software Engineering Institute (SEI). The object of this work is to create an automatically generated and indexed worldwide database of so...

R. C. Seacord S. A. Hissam K. C. Wallnau

1998-01-01

125

Devising rocket power for smaller engines  

Microsoft Academic Search

Compact, high-power engines that burn fuel and oxygen could be made by winding copper tubing in a helix around boiler sections. With more than 1,000 horsepower per pound of engine weight, liquid-fueled rockets have the highest specific power of any engines designed for sustained operation. Yet those engines generally run for about only 1,000 seconds--nowhere near the sustained operation time

Burruss

1996-01-01

126

Fault tree analysis of nuclear power plant components and systems. (Latest citations from the INSPEC: Information Services for the Physics and Engineering Communities data base). Published Search  

SciTech Connect

The bibliography contains citations concerning risk assessment, reliability analysis, failure analysis, and safety studies of nuclear power plant components and systems using fault tree analysis methods. Faults caused by components, human error, environmental considerations, and common mode failures are presented. Various systems and components are analyzed, including high pressure safety injection, auxiliary feedwater, instrumentation, emergency core flooding and cooling, and steam generator tubing. (Contains a minimum of 59 citations and includes a subject term index and title list.)

Not Available

1992-09-01

127

Integrated engine generator for aircraft secondary power  

NASA Technical Reports Server (NTRS)

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.

Secunde, R. R.

1972-01-01

128

Search engine vulnerabilities and threats - a survey and proposed solution for a secured censored search platform  

Microsoft Academic Search

Our internet user base is growing up rapidly. Though it is a click away to mankind it is a giant leap in the history of Information Technology and website. With millions of servers to offer several services, we have approximately 1.8 billons of user searching, blogging, posting, and mailing daily. Most users navigate to web pages through search engines like

R. Priyadarshini; S. Aishwarya; A. Ajaaz Ahmed

2010-01-01

129

Site-Specific versus General Purpose Web Search Engines: A Comparative Evaluation  

Microsoft Academic Search

We can distinguish two types of web search engines: general use ones that index and search all the web, and site-specific ones that are provided by individual websites for local searching. A comparisson of the effectiveness of the two types allows search engine users to choose the right engine and organizations to decide whether they should develop their own search

Georgios Atsaros; Diomidis Spinellis; Panagiotis Louridas

2008-01-01

130

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.

131

Contingency power concepts for helicopter turboshaft engine  

NASA Technical Reports Server (NTRS)

Twin helicopter engines are often sized by power requirement of safe mission completion after the failure of one of the two engines. This study was undertaken for NASA Lewis by General Electric Co. to evaluate the merits of special design features to provide a 2-1/2 minute Contingency Power rating, permitting an engine size reduction. The merits of water injection, cooling flow modulation, throttle push and an auxiliary power plant were evaluated using military life cycle cost (LCC) and commercial helicopter direct operating cost (DOC) merit factors in a rubber engine/rubber aircraft scenario.

Hirschkron, R.; Davis, R. H.; Goldstein, D. N.; Haynes, J. F.; Gauntner, J. W.

1984-01-01

132

Classifying Search Engine Queries Using the Web as Background Knowledge  

Microsoft Academic Search

The performance of search engines crucially depends on their\\u000a ability to capture the meaning of a query most likely intended\\u000a by the user. We study the problem of mapping a\\u000a search engine query to those nodes of a given subject taxonomy\\u000a that characterize its most likely meanings. We describe\\u000a the architecture of a classification system that uses a\\u000a web directory

David S. Vogel; Steffen Bickel; Peter Haider; Rolf Schimpfky; Peter Siemen; Steve Bridges; Tobias Scheffer

2005-01-01

133

Harmony Search Applications in Mechanical, Chemical and Electrical Engineering  

Microsoft Academic Search

The primary aim of this chapter is to introduce the state of the art applications of the harmony search (HS) algorithm in\\u000a mechanical, chemical and electrical engineering fields. The HS algorithm has been broadly utilized in complex optimization\\u000a problems arising in most engineering applications. It has been reported to be a viable alternative to other conventional optimization\\u000a techniques in these

Mohammad Fesanghary

134

A nonredundant ternary CAM circuit for network search engines  

Microsoft Academic Search

An optimized Ternary CAM concept is introduced for the hardware search engines in high-speed Internet routers. Our design employs w + 1 RAM bits to store a word of size w, whereas a conventional TCAM needs 2w RAM bits for the same word size. Based on this concept an 8-bit cluster is designed out of 9 SRAM bits, used as

Mohammad J. Akhbarizadeh; Mehrdad Nourani; Deepak S. Vijayasarathi; T. Balsara

2006-01-01

135

Virage Image Search Engine: An Open Framework for Image Management  

Microsoft Academic Search

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

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

1996-01-01

136

Locality in Search Engine Queries and Its Implications for Caching.  

National Technical Information Service (NTIS)

Caching is a popular technique for reducing both server load and user response time in distributed systems. In this paper, the authors are interested in the question of whether caching might be effective for search engines as well. They study two real sea...

D. O'Hallaron Y. Xie

2001-01-01

137

Semantic similarity between search engine queries using temporal correlation  

Microsoft Academic Search

We investigate the idea of finding semantically related search engine queries based on their ; in other words, we infer that two queries are related if their popularities behave similarly over time. To this end, we first define a new measure of the temporal correlation of two queries based on the correlation coefficient of their frequency functions. We then conduct

Steve Chien; Nicole Immorlica

2005-01-01

138

Shaping the Web: Why the Politics of Search Engines Matters  

Microsoft Academic Search

Thisarticlearguesthatsearchenginesraisenotmerelytechnical issues but also political ones. Our study of search engines suggests that they systematically exclude (in some cases by design and in some, accidentally ) certain sites and certain types of sites in favor of others, systematically giving prominence to some at the expense of others. We argue that such biases, which would lead to a nar- rowing of

Lucas D. Introna; Helen Nissenbaum

2000-01-01

139

Modeling score distributions for combining the outputs of search engines  

Microsoft Academic Search

In this paper the score distributions of a number of text search engines are modeled. It is shown empirically that the score distributions on a per query basis may be fitted using an exponential distribution for the set of non-relevant documents and a normal distribution for the set of relevant documents. Experiments show that this model fits TREC-3 and TREC-4

R. Manmatha; Toni M. Rath; Fangfang Feng

2001-01-01

140

Transparent Queries: investigation users' mental models of search engines  

Microsoft Academic Search

Typically, commercial Web search engines provide very little feedback to the user concerning how a particular query is processed and interpreted. Specifically, they apply key query transformations without the users knowledge. Although these transformations have a pronounced effect on query results, users have very few resources for recognizing their existence and understanding their practical importance. We conducted a user study

Jack Muramatsu; Wanda Pratt

2001-01-01

141

Querying the Semantic Web with Corese Search Engine  

Microsoft Academic Search

This paper presents an ontology-based approach for web querying, using semantic metadata. We propose a query language based on ontologies and emphasize its ability to express approximate queries, useful for an efficient information retrieval on the web. We present the Corese search engine dedicated to RDF(S) metadata and illustrate it through several real-world applications.

Olivier Corby; Rose Dieng-Kuntz; Catherine Faron-zucker

2004-01-01

142

Improved Techniques for Caches of Search Engines Results  

Microsoft Academic Search

Result caching is an efficient technique for reducing the query processing load, hence it is commonly used in search engines. In this paper, we study query result caching and proposes a cache management policy for achieving higher hit ratios compared to traditional heuristics methods. Our cache management policy comprises an eviction policy and an admission policy, and it divides the

Hui Li; Cun-hua Li; Yun Hu; Shu Zhang; Xia Wang

2010-01-01

143

Improved techniques for result caching in web search engines  

Microsoft Academic Search

Query processing is a major cost factor in operating large web search engines. In this paper, we study query result caching, one of the main techniques used to optimize query processing performance. Our first contribution is a study of result caching as a weighted caching problem. Most previous work has focused on optimizing cache hit ratios, but given that processing

Qingqing Gan; Torsten Suel

2009-01-01

144

Could Mind Maps Be Used To Improve Academic Search Engines?  

Microsoft Academic Search

In this paper the idea of mind map mining is presented. We propose that information retrieved from mind maps could improve academic search engines. The basic idea is that from a mind map's text, keywords can be retrieved to describe research articles referenced by the mind map. So far, we have not conducted any research on mind map mining. Therefore

Jöran Beel; Bela Gipp; Jan Olaf

145

WebPosition Gold Search Engine and Web Promotion Software  

NSDL National Science Digital Library

A product of FirstPlace Software, WebPosition Gold provides a way to increase traffic to your Web site without spending advertising dollars. WebPosition Gold generates HTML pages designed to rank near the top of search results, analyzes existing Web pages, gives advice on how to improve upon pages, assists in uploading new and changed pages, automatically submits pages to major search engines, and reports positions on each search engine for each keyword targeted. It also tracks the number of visitors to your site, where they came from, and what keywords they used to access the site. Before trying the working free trial version of WebPosition Gold, users must register (name and e-mail address) for notification of any product announcements or new updates. However, users may unsubscribe at any time.

1997-01-01

146

Unified power engineering laboratory for electromechanical energy  

Microsoft Academic Search

Summary form only given. This paper introduces a unified power engineering laboratory capable of various experiments for power systems, power electronics and electromechanical energy conversion. It presents a flexible hardware setup, data acquisition (DAQ), and virtual instrumentation (VI), the base of our unified lab. Some features of virtual instrumentation are shown with real-time phasor diagrams, sequence component analysis, and spectral

T. Gedra; Seungwon An

2004-01-01

147

An efficient quantum search engine on unsorted database  

NASA Astrophysics Data System (ADS)

We consider the problem of finding one or more desired items out of an unsorted database. Patel has shown that if the database permits quantum queries, then mere digitization is sufficient for efficient search for one desired item. The algorithm, called factorized quantum search algorithm, presented by him can locate the desired item in an unsorted database using O() queries to factorized oracles. But the algorithm requires that all the attribute values must be distinct from each other. In this paper, we discuss how to make a database satisfy the requirements, and present a quantum search engine based on the algorithm. Our goal is achieved by introducing auxiliary files for the attribute values that are not distinct, and converting every complex query request into a sequence of calls to factorized quantum search algorithm. The query complexity of our algorithm is O() for most cases.

Lu, Songfeng; Zhang, Yingyu; Liu, Fang

2013-10-01

148

Initial tests of thermoacoustic space power engine.  

SciTech Connect

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.

Backhaus, S. N. (Scott N.)

2002-01-01

149

Stabilizing Superconductors for Power Engineering Applications.  

National Technical Information Service (NTIS)

Exhibiting essentially zero resistivity at high current densities and large magnetic fields, modern superconducting materials offer intriguing possibilities in power engineering. However, in order to utilize this property in any large scale application, t...

J. K. Hoffer E. C. Kerr H. L. Laquer

1975-01-01

150

Embedding remote experimentation in power engineering education  

Microsoft Academic Search

Engineering education by its nature is a costly program in university environments. Perhaps the most costly component is the laboratory facility, usually consisting of specialized equipment. Effective instruction of some topics in power engineering education requires experience with actual equipment, rather than small-scale replicas or simulation. In this paper, a new laboratory approach is described, as implemented in a virtual,

Mihaela M. Albu; Keith E. Holbert; Gerald Thomas Heydt; Sorin Dan Grigorescu; V. Trusca

2004-01-01

151

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

Code of Federal Regulations, 2013 CFR

...engine brake power and engine speed for an engine, using the mapping procedures of 40 CFR part 1065, based on the manufacturer's...allow manufacturers to base the nominal power curve on other mapping procedures, consistent with good engineering...

2013-07-01

152

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

ERIC Educational Resources Information Center

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…

Darrah, Brenda

153

Next-Generation Search Engines for Information Retrieval  

SciTech Connect

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.

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

2011-01-01

154

40 CFR 1039.140 - What is my engine's maximum engine power?  

Code of Federal Regulations, 2013 CFR

...engine configuration is the relationship between maximum available engine brake power and engine speed for an engine, using the mapping procedures of 40 CFR part 1065, based on the manufacturer's design and production specifications for the engine....

2013-07-01

155

40 CFR 1045.140 - What is my engine's maximum engine power?  

Code of Federal Regulations, 2013 CFR

...engine configuration is the relationship between maximum available engine brake power and engine speed for an engine, using the mapping procedures of 40 CFR part 1065, based on the manufacturer's design and production specifications for the engine....

2013-07-01

156

FPS-RAM: Fast Prefix Search RAM-Based Hardware for Forwarding Engine  

NASA Astrophysics Data System (ADS)

Ternary content addressable memory (TCAM) is becoming very popular for designing high-throughput forwarding engines on routers. However, TCAM has potential problems in terms of hardware and power costs, which limits its ability to deploy large amounts of capacity in IP routers. In this paper, we propose new hardware architecture for fast forwarding engines, called fast prefix search RAM-based hardware (FPS-RAM). We designed FPS-RAM hardware with the intent of maintaining the same search performance and physical user interface as TCAM because our objective is to replace the TCAM in the market. Our RAM-based hardware architecture is completely different from that of TCAM and has dramatically reduced the costs and power consumption to 62% and 52%, respectively. We implemented FPS-RAM on an FPGA to examine its lookup operation.

Zaitsu, Kazuya; Yamamoto, Koji; Kuroda, Yasuto; Inoue, Kazunari; Ata, Shingo; Oka, Ikuo

157

Power of a Finite Speed Carnot Engine  

ERIC Educational Resources Information Center

A model of an endoreversible Carnot engine is considered where the piston moves with a constant speed "u." Expressions for the cycle time [tau] for the four branches, as well as output power, P[subscript W], are derived and the optimized root for maximum power is obtained in closed form. Our results are discussed in terms of the isothermal…

Agrawal, D. C.; Menon, V. J.

2009-01-01

158

Power engineering lab: electricity market simulator  

Microsoft Academic Search

This paper presents a successful lab experience to teach pool-based electricity markets to power engineering students. Students are arranged in groups and assigned, at random, a set of generators. They play the role of power producers and compete against each other with the target of maximizing their own profits. The instructor plays the role of the market operator. A market

J. Contreras; A. J. Conejo; S. de la Torre; M. G. Munoz

2002-01-01

159

SEARCH ENGINES IN THE E-PROMOTIONS MIX: A PRELIMINARY EMPIRICAL INVESTIGATION  

Microsoft Academic Search

Due to the large proportion of consumers that use search engines to identify sources of products or services, it is the contention of this study that any e-promotion activities in which a firm engages must start with search engine positioning. Consequently, this study examines the use of basic search engine placement tactics by businesses to enhance their visibility.

Craig A. Conrad; Timothy Johnston

160

A Machine Learning Approach to Building Domain-Specific Search Engines  

Microsoft Academic Search

Domain-specic search engines are becomingincreasingly popular because they oer increasedaccuracy and extra features not possiblewith general, Web-wide search engines.Unfortunately, they are also di?cult and timeconsumingto maintain. This paper proposesthe use of machine learning techniques togreatly automate the creation and maintenanceof domain-specic search engines. We describenew research in reinforcement learning, textclassication and information extraction thatenables...

Andrew Mccallum; Kamal Nigam; Jason Rennie; Kristie Seymore

1999-01-01

161

The way to increased airplane engine power  

NASA Technical Reports Server (NTRS)

The purpose of this paper is to give an outline of the present state of development and point out the possibilities available for the further increase in the power/displacement ratio, the economy, and the reliability of the engine. Some of the aspects discussed are methods of increasing take-off power, the various methods of preparation of the fuel mixture and their effect on power, economy, and safety.

Vohrer, Eugen

1939-01-01

162

The Information-Seeking Practices of Engineers: Searching for Documents as Well as for People.  

ERIC Educational Resources Information Center

Investigates engineers' information-seeking practices based on case studies in two organizations. Results show engineers search for documents to find people, search for people to get documents, and interact socially to get information without engaging in explicit searches. Discusses the design task and how computer systems could support searches

Hertzum, Morten; Pejtersen, Annelise Mark

2000-01-01

163

Brand and its Effect on User Perception of Search Engine Performance  

Microsoft Academic Search

In this research we investigate the effect of search engine brand on the evaluation of searching performance. Our research is motivated by the large amount of search traf- fic directed to a handful of Web search engines, even though many have similar interfaces and performance. We conducted a laboratory experiment with 32 partic- ipants using a 4 2 factorial design

Bernard J. Jansen; Mimi Zhang; Carsten D. Schultz

2009-01-01

164

Internet Power Searching: Finding Pearls in a Zillion Grains of Sand.  

ERIC Educational Resources Information Center

Discusses searching on the World Wide Web. Highlights include search-engine size; features of the six largest search engines; features of five metasearch engines; intelligent agents; two Web sites for difficult-to-find information, including industry statistics and market data; Internet publishers and databases; specialty search engines; and…

Kassel, Amelia

1999-01-01

165

BIRP - A way to search through image engineering data  

NASA Technical Reports Server (NTRS)

Several hundred thousand images have been returned by planetary missions and by earth-orbiting satellites. Locating specific images for study based on engineering data can be cumbersome and time consuming if done manually. BIRP, a FORTRAN program for small computers, is designed to quickly search through catalogs of image engineering data. A description of the desired images is entered and the BIRP program finds the images meeting the requirements. A videodisk player or microfiche reader may be controlled by BIRP so that images can be viewed immediately after a search. A search through 50,000 images on a single parameter takes less than 1 min on a minicomputer. Data for each parameter is stored in a separate file so that the number of files and thus the storage space required may be varied to fit computers with different storage capacities. Most modern minicomputers with FORTRAN compilers and an 8-bit byte variable type may use BIRP with minor modifications to the program.

Bolef, L. K.; Guinness, E. A.; Arvidson, R. E.

1982-01-01

166

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

NASA Astrophysics Data System (ADS)

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.

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

167

A personalized search engine based on web-snippet hierarchical clustering  

Microsoft Academic Search

In this paper we propose a hierarchical clustering engine, called snaket, that is able to organize on-the-fly the search results drawn from 16 commodity search engines into a hierarchy of labeled folders. The hierarchy offers a complementary view to the flat-ranked list of results returned by current search engines. Users can navigate through the hierarchy driven by their search needs.

Paolo Ferragina; Antonio Gulli

2005-01-01

168

Tocorime Apicu: design and validation of an experimental search engine  

NASA Astrophysics Data System (ADS)

In the development of an integrated, experimental search engine, Tocorime Apicu, the incorporation and emulation of the evolutionary aspects of the chosen biological model (honeybees) and the field of high-performance knowledge discovery in databases results in the coupling of diverse fields of research: evolutionary computations, biological modeling, machine learning, statistical methods, information retrieval systems, active networks, and data visualization. The use of computer systems provides inherent sources of self-similarity traffic that result from the interaction of file transmission, caching mechanisms, and user-related processes. These user-related processes are initiated by the user, application programs, or the operating system (OS) for the user's benefit. The effect of Web transmission patterns, coupled with these inherent sources of self-similarity associated with the above file system characteristics, provide an environment for studying network traffic. The goal of the study was client-based, but with no user interaction. New methodologies and approaches were needed as network packet traffic increased in the LAN, LAN+WAN, and WAN. Statistical tools and methods for analyzing datasets were used to organize data captured at the packet level for network traffic between individual source/destination pairs. Emulation of the evolutionary aspects of the biological model equips the experimental search engine with an adaptive system model which will eventually have the capability to evolve with an ever- changing World Wide Web environment. The results were generated using a LINUX OS.

Walker, Reginald L.

2001-07-01

169

Search for Axions at a Power Reactor.  

National Technical Information Service (NTIS)

A search has been conducted for the axion at the Bugey reactor which is owned and operated by Electricite de France. The axion production should be proportional to the magnetic transition of np capture, and be detectable by its decay into 2 gamma rays. No...

C. Cavaignac A. Hoummada D. H. Koang

1982-01-01

170

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

Microsoft Academic Search

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

Bancha Kongtragool; Somchai Wongwises

2003-01-01

171

In Search of Search Engine Marketing Strategy Amongst SME's in Ireland  

NASA Astrophysics Data System (ADS)

Researchers have identified the Web as a searchers first port of call for locating information. Search Engine Marketing (SEM) strategies have been noted as a key consideration when developing, maintaining and managing Websites. A study presented here of SEM practices of Irish small to medium enterprises (SMEs) reveals they plan to spend more resources on SEM in the future. Most firms utilize an informal SEM strategy, where Website optimization is perceived most effective in attracting traffic. Respondents cite the use of ‘keywords in title and description tags’ as the most used SEM technique, followed by the use of ‘keywords throughout the whole Website’; while ‘Pay for Placement’ was most widely used Paid Search technique. In concurrence with the literature, measuring SEM performance remains a significant challenge with many firms unsure if they measure it effectively. An encouraging finding is that Irish SMEs adopt a positive ethical posture when undertaking SEM.

Barry, Chris; Charleton, Debbie

172

The information-seeking practices of engineers: searching for documents as well as for people  

Microsoft Academic Search

Engineers get most of their information from colleagues and internal reports. This study investigates how engineers' information-seeking practices intertwine looking for informing documents with looking for informed people. Based on case studies in two product-development organisations we find that engineers search for documents to find people, search for people to get documents, and interact socially to get information without engaging

Morten Hertzum; Annelise Mark Pejtersen

2000-01-01

173

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

NASA Astrophysics Data System (ADS)

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.

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

1999-08-01

174

Power control for hot gas engines  

NASA Technical Reports Server (NTRS)

A hot gas engine in which the expander piston of the engine is connected to an expander crankshaft. A displacer piston of the engine is connected to a separate displacer crankshaft which may or may not be coaxial with the expander crankshaft. A phase angle control mechanism used as a power control for changing the phase angle between the expander and displacer crankshaft is located between the two crankshafts. The phase angle control mechanism comprises a differential type mechanism comprised of a pair of gears, as for example, bevel gears, one of which is connected to one end of the expander crankshaft and the other of which is connected to the opposite end of the displacer crankshaft. A mating bevel gear is disposed in meshing engagement with the first two level gears to provide a phase angle control between the two crankshafts. Other forms of differential mechanisms may be used including conventional spur gears connected in a differential type arrangement.

Macglashan, W. F. (inventor)

1980-01-01

175

Microwave technologies in coal power engineering  

NASA Astrophysics Data System (ADS)

An analysis of the modern state and prospects of using microwave radiation in the processes of drying, dispersion, burning, and fine processing of low-rank coals for the purpose of increasing the energy efficiency of coal technologies and decreasing harmful emissions from them has been carried out. It is shown that the use of microwave-radiation energy in coal power engineering is a promising method of complex action on coal in the process of its preparation and burning.

Salomatov, V. V.; Sladkov, S. O.; Pashchenko, S. É.

2012-05-01

176

Solar power satellites: The Engineering Challenges  

NASA Technical Reports Server (NTRS)

Certain elements of solar power satellite design and system engineering studies are reviewed analyzing solar power satellites as a potential baseload electric power source. The complete system concept concept includes not only the satellites and their ground stations, but also the space transportation for delivery of the satellites, piece by piece, into space, and the factories for their construction in space. Issues related to carrying the solar power satellite concept from the present design study phase through implementation of actual hardware are considered. The first issue category is environmental aspects of the SPS systems. The second category of issues is the technology risks associated with achieving the necessary component and subsystem performances. The third category includes the engineering issues associated with carrying out such a large scale project. The fourth issue category is financial: the funding required to bring such a project into being and the costs of the satellites and resulting cost of the power produced as compared to potential alternative energy sources.

Woodcock, G. R.

1978-01-01

177

A Longest Prefix Match Search Engine For Multi-Gigabit IP Processing  

Microsoft Academic Search

We propose an IP forwarding table search engine architecture, VLMP (vertical logical operation with mask-encoded prefix-length), for routers with multi-gigabit\\/sec speed links. We discuss the existing approaches and the requirements for search engines, and go on to propose VLMP search engine architecture that expands upon a content addressable memory (CAM) and can perform wire-speed packet processing of an OC-192 (9.6

Masayoshi Kobayashi; Tutomu Murase; Atsushi Kuriyama

2000-01-01

178

Arctic Data Explorer: A Rich Solr Powered Metadata Search Portal  

NASA Astrophysics Data System (ADS)

The Advanced Cooperative Arctic Data and Information Service (ACADIS) manages data and is the gateway for all relevant Arctic physical, life, and social science data for the Arctic Sciences (ARC) research community. Arctic Data Explorer (ADE), developed by the National Snow and Ice Data Center (NSIDC) under the ACADIS umbrella, is a data portal that provides users the ability to search across multiple Arctic data catalogs rapidly and precisely. In order to help the users quickly find the data they are interested in, we provided a simple search interface -- a search box with spatial and temporal options. The core of the interface is a ';google-like' single search box with logic to handle complex queries behind the scenes. ACADIS collects all metadata through the GI-Cat metadata broker service and indexes it in Solr. The single search box is implemented as a text based search utilizing the powerful tools provided by Solr. In this poster, we briefly explain Solr's indexing and searching capabilities. Several examples are presented to illustrate the rich search functionality the simple search box supports. Then we dive into the implementation details such as how phrase query, wildcard query, range query, fuzzy query and special query search term handling was integrated into ADE search. To provide our users the most relevant answers to their queries as quickly as possible, we worked with the Advisory Committee and the expanding Arctic User Community (scientists and data experts) to collect feedback to improve the search results and adjust the relevance/ranking logic to return more precise search results. The poster has specific examples on how we tuned the relevance ranking to achieve higher quality search results. A feature in the plan is to provide data sets recommendations based on user's current search history. Both collaborative filtering and content-based approaches were considered and researched. A feasible solution is proposed based on the content-based approach.

Liu, M.; Truslove, I.; Yarmey, L.; Lopez, L.; Reed, S. A.; Brandt, M.

2013-12-01

179

Exploiting Query Repetition and Regularity in an Adaptive Community-Based Web Search Engine  

Microsoft Academic Search

Search engines continue to struggle with the challenges presented by Web search: vague queries, impatient users and an enormous and rapidly expanding collection of unmoderated, heterogeneous documents all make for an extremely hostile search environment. In this paper we argue that conventional approaches to Web search -- those that adopt a traditional, document-centric, information retrieval perspective -- are limited by

Barry Smyth; Evelyn Balfe; Jill Freyne; Peter Briggs; Maurice Coyle; Oisín Boydell

2004-01-01

180

Optimal reactive power dispatch based on harmony search algorithm  

Microsoft Academic Search

This paper presents a harmony search algorithm for optimal reactive power dispatch (ORPD) problem. Optimal reactive power dispatch is a mixed integer, nonlinear optimization problem which includes both continuous and discrete control variables. The proposed algorithm is used to find the settings of control variables such as generator voltages, tap positions of tap changing transformers and the amount of reactive

A. H. Khazali; M. Kalantar

2011-01-01

181

OrChem - An open source chemistry search engine for Oracle®  

PubMed Central

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.

2009-01-01

182

Java-Based Search Engine Technology in Web Information Mining Application  

Microsoft Academic Search

With the rapid growth of network information resources, it is more and more concerned to extract potentially valuable information from the massive network of information, to make it effective in the management and decision-making role. Search engine technology solves the user on network information retrieval difficulties, current search engine technology is becoming the computer science community and the information industry

Chu Li Li

2010-01-01

183

Finding Information on the World Wide Web: The Retrieval Effectiveness of Search Engines.  

ERIC Educational Resources Information Center

Describes a study that examined the effectiveness of eight search engines for the World Wide Web. Calculated traditional information-retrieval measures of recall and precision at varying numbers of retrieved documents to use as the bases for statistical comparisons of retrieval effectiveness. Also examined the overlap between search engines.…

Pathak, Praveen; Gordon, Michael

1999-01-01

184

Finding Information on the World Wide Web: The Retrieval Effectiveness of Search Engines  

Microsoft Academic Search

Search engines are essential for finding information on the World Wide Web. We conducted a study to see how eÄective eight search engines are. Expert searchers sought information on the Web for users who had legitimate needs for information, and these users assessed the relevance of the information retrieved. We calculated traditional information retrieval measures of recall and precision at

Michael D. Gordon; Praveen Pathak

1999-01-01

185

Design of personalized search engine based on user-webpage dynamic model  

NASA Astrophysics Data System (ADS)

Personalized search engine focuses on establishing a user-webpage dynamic model. In this model, users' personalized factors are introduced so that the search engine is better able to provide the user with targeted feedback. This paper constructs user and webpage dynamic vector tables, introduces singular value decomposition analysis in the processes of topic categorization, and extends the traditional PageRank algorithm.

Li, Jihan; Li, Shanglin; Zhu, Yingke; Xiao, Bo

2013-12-01

186

WebSeer: An Image Search Engine for the World Wide Web1  

Microsoft Academic Search

Because of the size of the World Wide Web and its inherent lack of structure, finding what one is looking for can be a challenge. PC-Meter's March, 1996, survey found that three of the five most visited Web sites were search engines. However, while Web pages typically contain both text and images, all the currently available search engines only index

Charles Frankel; Michael J. Swain; Vassilis Athitsos

1996-01-01

187

Academic Search Engine Optimization (ASEO): Optimizing Scholarly Literature for Google Scholar & Co  

Microsoft Academic Search

This article introduces and discusses the concept of academic search engine optimization (ASEO). Based on three recently conducted studies, guidelines are provided on how to optimize scholarly literature for academic search engines in general and for Google Scholar in particular. In addition, we briefly discuss the risk of researchers' illegitimately 'over-optimizing' their articles.

Jöran Beel; Bela Gipp; Erik Wilde

2010-01-01

188

Academic Search Engine Optimization (ASEO): Optimizing Scholarly Literature for Google Scholar & Co  

Microsoft Academic Search

This article introduces and discusses the concept of academic search engine optimization (ASEO). Based on three recently conducted studies, guidelines are provided on how to optimize scholarly literature for academic search engines in general, and for Google Scholar in particular. In addition, we briefly discuss the risk of researchers' illegitimately 'over-optimizing' their articles.

JÃran Beel; Bela Gipp

2010-01-01

189

An investigation of user attitudes toward search engines as an information retrieval tool  

Microsoft Academic Search

After the Internet has gained great popularity at homes and schools, there is much information on the Web. Today, one of the primary uses of the Internet is information retrieval from search engines. The main purpose of the current study is to develop and examine an individual attitude model towards search engines as a tool for retrieving information. This model

Shu-Sheng Liaw; Hsiu-Mei Huang

2003-01-01

190

Heat engine development for solar thermal power systems  

NASA Technical Reports Server (NTRS)

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.

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

1981-01-01

191

Evaluating Search Engine Relevance with Click-Based Metrics  

NASA Astrophysics Data System (ADS)

Automatically judging the quality of retrieval functions based on observable user behavior holds promise for making retrieval evaluation faster, cheaper, and more user centered. However, the relationship between observable user behavior and retrieval quality is not yet fully understood. In this chapter, we expand upon, Radlinski et al. (How does clickthrough data reflect retrieval quality, In Proceedings of the ACM Conference on Information and Knowledge Management (CIKM), 43-52, 2008), presenting a sequence of studies investigating this relationship for an operational search engine on the arXiv.org e-print archive. We find that none of the eight absolute usage metrics we explore (including the number of clicks observed, the frequency with which users reformulate their queries, and how often result sets are abandoned) reliably reflect retrieval quality for the sample sizes we consider. However, we find that paired experiment designs adapted from sensory analysis produce accurate and reliable statements about the relative quality of two retrieval functions. In particular, we investigate two paired comparison tests that analyze clickthrough data from an interleaved presentation of ranking pairs, and find that both give accurate and consistent results. We conclude that both paired comparison tests give substantially more accurate and sensitive evaluation results than the absolute usage metrics in our domain.

Radlinski, Filip; Kurup, Madhu; Joachims, Thorsten

192

Measurement of acoustic output power in a traveling wave engine  

Microsoft Academic Search

We built and tested a double-loop thermoacoustic cooler consisting of an engine-loop, a branch resonator, and a cooler-loop. The cooling power of 6.4W was obtained at the cooling temperature of 0°C, when the input heat power of 416W was supplied to the engine-loop. We measured the acoustic power and found that the output power emitted from the engine-loop was 12W,

M. Miwa; T. Sumi; T. Biwa; Y. Ueda; T. Yazaki

2006-01-01

193

Understanding Crowd-Powered Search Groups: A Social Network Perspective  

PubMed Central

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.

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

2012-01-01

194

The perfect search engine is not enough: a study of orienteering behavior in directed search  

Microsoft Academic Search

This paper presents a modified diary study that investigated how people performed personally motivated searches in their email, in their files, and on the Web. Although earlier studies of directed search focused on keyword search, most of the search behavior we observed did not involve keyword search. Instead of jumping directly to their information target using keywords, our participants navigated

Jaime Teevan; Christine Alvarado; Mark S. Ackerman; David R. Karger

2004-01-01

195

Identifying clusters of user behavior in intranet search engine log files  

Microsoft Academic Search

When studying how ordinary Web users interact with Web search engines,researchers tend to either treat the users as a homogeneous group or group them accord- ing to search experience. Neither approach is sufficient, we argue,to capture the variety in behavior that is known to exist among searchers. By applying automatic cluster- ing technique based on self-organizing maps to search engine

Dick Stenmark

2008-01-01

196

Methods for evaluating dynamic changes in search engine rankings: a case study  

Microsoft Academic Search

Purpose – The objective of this paper is to characterize the changes in the rankings of the top ten results of major search engines over time and to compare the rankings between these engines. Design\\/methodology\\/approach – The papers compare rankings of the top-ten results of the search engines Google and AlltheWeb on ten identical queries over a period of three

Judit Bar-Ilan; Mark Levene; Mazlita Mat-Hassan

2006-01-01

197

Unified power engineering laboratory for electromechanical energy conversion, power electronics, and power systems  

Microsoft Academic Search

This paper introduces a unified power engineering laboratory capable of various experiments for power systems, power electronics, and electromechanical energy conversion. It presents a flexible hardware setup, data acquisition (DAQ), and virtual instrumentation (VI). Some features of virtual instrumentation are shown with real-time phasor diagrams, sequence component analysis, and spectral analysis of AC data. We describe the general design of

Thomas W. Gedra; Seungwon An; Q. H. Arsalan; S. Ray

2004-01-01

198

A cross-disciplinary technology transfer for search-based evolutionary computing: from engineering design to software engineering design  

Microsoft Academic Search

Although object-oriented conceptual software design is difficult to learn and perform, computational tool support for the conceptual software designer is limited. In conceptual engineering design, however, computational tools exploiting interactive evolutionary computation (EC) have shown significant utility. This article investigates the cross-disciplinary technology transfer of search-based EC from engineering design to software engineering design in an attempt to provide support

C. L. Simons; I. C. Parmee

2007-01-01

199

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

PubMed Central

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.

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

2012-01-01

200

Integrated engine-generator concept for aircraft electric secondary power  

NASA Technical Reports Server (NTRS)

The integrated engine-generator concept of locating an electric generator inside an aircraft turbojet or turbofan engine concentric with, and driven by, one of the main engine shafts is discussed. When properly rated, the generator can serve as an engine starter as well as a generator of electric power. The electric power conversion equipment and generator controls are conveniently located in the aircraft. Preliminary layouts of generators in a large engine together with their physical sizes and weights indicate that this concept is a technically feasible approach to aircraft secondary power.

Secunde, R. R.; Macosko, R. P.; Repas, D. S.

1972-01-01

201

The Current State and Future of Search Based Software Engineering  

Microsoft Academic Search

This paper describes work on the application of optimization techniques in software engineering. These optimization techniques come from the operations research and metaheuristic computation research communities. The paper briefly reviews widely used optimization techniques and the key ingredients required for their successful application to software engineering, providing an overview of existing results in eight software engineering application domains. The paper

Mark Harman

2007-01-01

202

Solar powered free-piston stirling engine  

SciTech Connect

A solar-powered Stirling engine is described comprising: a solar receiver which converts solar radiation to thermal energy; a storage chamber for thermal energy in heat transfer communication with the receiver; a displacer including a displacer chamber and a differential area displacer piston with variable electromagnetic damping means dividing the displacer chamber into separate hot and cold subchambers respectively, the hot subchamber being in heat transfer communication with the storage chamber; means for cooling the cold subchamber; an alternator including an alternator chamber and an alternator piston dividing the alternator chamber into working and bounce subchambers respectively, the working subchamber being in fluid communication with the cold subchamber of the displacer; a working fluid circulating through be cold subchamber and the working subchamber and in heat transfer communication with the storage chamber, the working fluid being displaced by the displacer piston to drive the alternator piston; and means for obtaining work output from the alternator piston.

Benson, G.M.

1987-02-17

203

One for all, and all for one? Identifying clusters of user behaviour in intranet search engine log files  

Microsoft Academic Search

In recent years a substantial amount of research has been focusing on how ordinary web users interact with search engines. However, these users are tacitly assumed to be a homogeneous group by researcher and vendor alike. We argue that search engine users should not be treated collectively and by applying automatic clustering technique based on self-organising maps to search engine

Dick Stenmark; Henrik Strindberg

204

The Extreme Searcher's Guide to Web Search Engines: A Handbook for the Serious Searcher. 2nd Edition.  

ERIC Educational Resources Information Center

This book aims to facilitate more effective and efficient use of World Wide Web search engines by helping the reader: know the basic structure of the major search engines; become acquainted with those attributes (features, benefits, options, content, etc.) that search engines have in common and where they differ; know the main strengths and…

Hock, Randolph

205

Information retrieval from the World Wide Web: a user-focused approach based on individual experience with search engines  

Microsoft Academic Search

Although search engines are essential tools for finding information on the World Wide Web, the effective use of search engines for information retrieval (IR) is a crucial challenge for any Internet user. Based on the user-focused approach, this study investigates individual information retrieval behaviors using information processing theory. The results show that experience with search engines significantly affects users’ attitudes

Shu-Sheng Liaw; Hsiu-Mei Huang

2006-01-01

206

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

207

19. Power plant engine pipinglower level plan, sheet 80 of ...  

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

19. Power plant engine piping-lower level plan, sheet 80 of 130 - Naval Air Station Fallon, Power Plant, 800 Complex, off Carson Road near intersection of Pasture & Berney Roads, Fallon, Churchill County, NV

208

21. POWER ROOM INTERIOR, DETAIL OF CATERPILLAR DIESEL ENGINE DIRECTLY ...  

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

21. POWER ROOM INTERIOR, DETAIL OF CATERPILLAR DIESEL ENGINE DIRECTLY CONNECTED TO GENERAL ELECTRIC 15 KW DC GENERATOR (ON LEFT), 110 VOLTS, 136 AMPS, 1200 RPM. INSTALLED 1942. - Death Valley Ranch, Power House, Death Valley Junction, Inyo County, CA

209

Measurement of acoustic output power in a traveling wave engine.  

PubMed

We built and tested a double-loop thermoacoustic cooler consisting of an engine-loop, a branch resonator, and a cooler-loop. The cooling power of 6.4 W was obtained at the cooling temperature of 0 degrees C, when the input heat power of 416 W was supplied to the engine-loop. We measured the acoustic power and found that the output power emitted from the engine-loop was 12 W, and that the input acoustic power entering the cooler-loop was 6 W. PMID:16996552

Miwa, M; Sumi, T; Biwa, T; Ueda, Y; Yazaki, T

2006-12-22

210

When Every Search Engine Knows Your Name. Online Treasures  

ERIC Educational Resources Information Center

This article explores personalized search technologies showing that various vendors are trying a variety of approaches. Brief descriptions are given of some of beta projects in effort to assist librarians seeking to offer services that meet their patrons' individual needs by exploring how personal search technologies are being used on the Web in…

Balas, Janet L.

2005-01-01

211

Secondary electric power generation with minimum engine bleed  

NASA Technical Reports Server (NTRS)

Secondary electric power generation with minimum engine bleed is discussed. Present and future jet engine systems are compared. The role of auxiliary power units is evaluated. Details of secondary electric power generation systems with and without auxiliary power units are given. Advanced bleed systems are compared with minimum bleed systems. A cost model of ownership is given. The difference in the cost of ownership between a minimum bleed system and an advanced bleed system is given.

Tagge, G. E.

1983-01-01

212

Single lever power control for piston aircraft engines  

Microsoft Academic Search

Based on the success of gas turbine and automotive engine control system designs, a single lever power control (SLPC) model for aircraft piston engines has been developed utilizing fuzzy logic controllers. To permit development and refinement of the SLPC controllers, a propulsion simulation workbench has been developed for simulation of light aircraft piston engine applications. The objective of the workbench

Scott E. Ashton; Louis F. Godbout

1997-01-01

213

Nuclear Engineering Technologists in the Nuclear Power Era  

ERIC Educational Resources Information Center

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)

Wang, C. H.; And Others

1974-01-01

214

Reverse Engineering Java Card Applets Using Power Analysis  

Microsoft Academic Search

Power analysis on smart cards is widely used to obtain infor- mation about implemented cryptographic algorithms. We propose sim- ilar methodology for Java Card applets reverse engineering. Because power analysis alone does not provide enough information, we refine our methodology by involving additional information sources. Issues like distinguishing between bytecodes performing similar tasks and reverse engineering of conditional branches and

Dennis Vermoen; Marc F. Witteman; Georgi Gaydadjiev

2007-01-01

215

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

NASA Technical Reports Server (NTRS)

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

Scott, John H.

2007-01-01

216

Development and tuning of an original search engine for patent libraries in medicinal chemistry  

PubMed Central

Background The large increase in the size of patent collections has led to the need of efficient search strategies. But the development of advanced text-mining applications dedicated to patents of the biomedical field remains rare, in particular to address the needs of the pharmaceutical & biotech industry, which intensively uses patent libraries for competitive intelligence and drug development. Methods We describe here the development of an advanced retrieval engine to search information in patent collections in the field of medicinal chemistry. We investigate and combine different strategies and evaluate their respective impact on the performance of the search engine applied to various search tasks, which covers the putatively most frequent search behaviours of intellectual property officers in medical chemistry: 1) a prior art search task; 2) a technical survey task; and 3) a variant of the technical survey task, sometimes called known-item search task, where a single patent is targeted. Results The optimal tuning of our engine resulted in a top-precision of 6.76% for the prior art search task, 23.28% for the technical survey task and 46.02% for the variant of the technical survey task. We observed that co-citation boosting was an appropriate strategy to improve prior art search tasks, while IPC classification of queries was improving retrieval effectiveness for technical survey tasks. Surprisingly, the use of the full body of the patent was always detrimental for search effectiveness. It was also observed that normalizing biomedical entities using curated dictionaries had simply no impact on the search tasks we evaluate. The search engine was finally implemented as a web-application within Novartis Pharma. The application is briefly described in the report. Conclusions We have presented the development of a search engine dedicated to patent search, based on state of the art methods applied to patent corpora. We have shown that a proper tuning of the system to adapt to the various search tasks clearly increases the effectiveness of the system. We conclude that different search tasks demand different information retrieval engines' settings in order to yield optimal end-user retrieval.

2014-01-01

217

The MediaMill TRECVID 2010 semantic video search engine  

Microsoft Academic Search

In this paper we describe our TRECVID 2010 video retrieval experiments. The MediaMill team participated in three tasks: semantic indexing, known-item search, and instance search. The starting point for the MediaMill concept detection approach is our top-performing bag-of-words system of TRECVID 2009, which uses multiple color SIFT descriptors, sparse codebooks with spatial pyramids, kernel-based machine learning, and multi-frame video processing.

C. G. M. Snoek; Sande van de K. E. A; Rooij de O; B. Huurnink; E. Gavves; D. Odijk; Rijke de M; T. Gevers; M. Worring; D. C. Koelma; A. W. M. Smeulders

2011-01-01

218

Cooperation Schemes between a Web Server and a Web Search Engine  

Microsoft Academic Search

Search engines provide search results based on a large repository of pages downloaded by a web crawler from sev- eral servers. To provide best results, this repository must be kept as fresh as possible, but this can be difficult due to the large volume of pages involved and to the fact that polling is the only method for detecting changes.

Carlos Castillo

2003-01-01

219

Adword auction bidding strategies of budget-limited advertisers on competing search engines  

Microsoft Academic Search

The economic stakes of advertising on the Internet — and in particular, of auctions for keywords in search engines- are enormous and still increasing. We focus in this paper on situations where bidders (advertisers) on sponsored search auction systems have a limited budget, so that they may not be able to afford to participate in all auctions. Using a game-theoretical

Patrick Maille; Bruno Tuffin

2011-01-01

220

Search Engines: A Primer on Finding Information on the World Wide Web.  

ERIC Educational Resources Information Center

Presents an annotated list of several World Wide Web search engines, including Yahoo, Infoseek, Alta Vista, Magellan, Lycos, Webcrawler, Excite, Deja News, and the LISZT Directory of discussion groups. Uniform Resource Locators (URLs) are included. Discussion assesses performance and describes rules and syntax for refining or limiting a search.…

Maddux, Cleborne

1996-01-01

221

A Music Based Harmony Search (MBHS) approach to Optimal Power Flow with reactive power loss optimization  

Microsoft Academic Search

This paper presents a new optimization algorithm, Music Based Harmony Search (MBHS) applied to the Optimal Power flow (OPF) problem with line constraints for minimizing the Fuel costs together with Generator Reactive power losses. The proposed method is compared with other optimization techniques like Simple Genetic Algorithm (SGA), Adaptive Genetic Algorithm (AGA) and Particle Swarm Optimization (PSO) to prove its

M. M. Bhaskar; Srinivas Muthyala; Sydulu Maheswarapu

2010-01-01

222

Indri: A language-model based search engine for complex queries1  

Microsoft Academic Search

Search and detection technology has been a focus of DARPA and ARDA research programs since the TIPSTER program began in the early 1990s (Harman 1992). A num-ber of innovations have been developed in this research, resulting in very significant improvements in the effective-ness of search tools. The Inquery search engine (Callan et al. 1995), developed at the University of Massachusetts

Trevor Strohman; Donald Metzler; Howard Turtle; W. Bruce Croft

2005-01-01

223

WebSeer: A n Image Search Engine for the World Wide Web  

Microsoft Academic Search

Because of the size of the World Wide Web and its inherentlack of structure, finding what one is looking for can bea challenge. In fact, some of the most highly visited Websites are search engines. However, while Web pages typicallycontain both text and images, most currently availablesearch engines only index text. This paper describesWebSeer, a system for locating images on

J. Swain

1997-01-01

224

Ultrasonic Inspection of Engine Nacelle Structure Searching for Cracks.  

National Technical Information Service (NTIS)

The observed results of the ultrasonic inspection of the engine nacelle structure of five aircraft are reported. The 45 degree wedge showed better echoes in the thicker tubes and cracks were not detected in any of the inspected nacelles.

L. X. Nepomuceno

1976-01-01

225

Electric power generation: Tidal and wave power. (Latest citations from the Aerospace database). Published Search  

SciTech Connect

The bibliography contains citations concerning the feasibility of obtaining electric power from ocean disturbances such as waves, swells, and tides. The engineering and economic aspects are emphasized. Theoretical analysis of the power plant potential of selected sites around the world is included. (Contains 250 citations and includes a subject term index and title list.)

Not Available

1994-12-01

226

Design of robust power system stabilizers in a multimachine power system using tabu search algorithm  

Microsoft Academic Search

This paper proposed a design of robust power system stabilizers (PSSs) in a multimachine power system using tabu search (TS) algorithm. Each PSS structure used is identical to that of a widely-used conventional lead-lag PSS (CPSS). The proposed design method arranges PSSs and a multimachine power system as a decentralized controller and a multi-input multi-output (MIMO) system, respectively. Practically, suitable

S. Dechanupaprittha; I. Ngamroo

2002-01-01

227

Integrated engine-generator for aircraft secondary power.  

NASA Technical Reports Server (NTRS)

The integrated engine-generator 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 conveniently located in the aircraft. When properly rated, the generator serves as an engine starter as well as a source of electric power. The available generating capacity permits use of electrically driven engine accessories. This reduces or eliminates the need for an external gearbox on the engine, thereby simplifying the engine and nacelle assembly and increasing aircraft design flexibility. The nacelle diameter can then be decreased, resulting in less aerodynamic drag and reduced takeoff gross weight.

Secunde, R. R.

1972-01-01

228

TIGR BLAST Search Engine for Unfinished Microbial Genomes  

NSDL National Science Digital Library

The Institute for Genomics Research (TIGR) has launched this searchable Website providing unfinished genome data sets for Pseudomonas syringae and Entamoeba histolytica. The site includes a table listing of the status of unfinished microbial genome data, as well as a BLAST search interface for locating protein and DNA sequences. Note that the sequences of these unpublished genomes are unfinished and contain errors.

1999-01-01

229

Civil Engineers Hone Search, Rescue Skills at Combat Town.  

National Technical Information Service (NTIS)

When disasters such as earthquakes, hurricanes or even a bombing devastate a city, someone has to sift through the rubble and look for survivors. A group of civil engineers recently journeyed here in order to prepare themselves to do just that. The System...

B. C. Powell

1998-01-01

230

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

NASA Astrophysics Data System (ADS)

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.

Reilly, P.

231

14 CFR 121.195 - Airplanes: Turbine engine powered: Landing limitations: Destination airports.  

Code of Federal Regulations, 2010 CFR

... § 121.195 Airplanes: Turbine engine powered: Landing limitations...a) No person operating a turbine engine powered airplane...section, no person operating a turbine engine powered airplane...destination airport and the wind conditions anticipated...

2010-01-01

232

Development of Health Information Search Engine Based on Metadata and Ontology  

PubMed Central

Objectives The aim of the study was to develop a metadata and ontology-based health information search engine ensuring semantic interoperability to collect and provide health information using different application programs. Methods Health information metadata ontology was developed using a distributed semantic Web content publishing model based on vocabularies used to index the contents generated by the information producers as well as those used to search the contents by the users. Vocabulary for health information ontology was mapped to the Systematized Nomenclature of Medicine Clinical Terms (SNOMED CT), and a list of about 1,500 terms was proposed. The metadata schema used in this study was developed by adding an element describing the target audience to the Dublin Core Metadata Element Set. Results A metadata schema and an ontology ensuring interoperability of health information available on the internet were developed. The metadata and ontology-based health information search engine developed in this study produced a better search result compared to existing search engines. Conclusions Health information search engine based on metadata and ontology will provide reliable health information to both information producer and information consumers.

Song, Tae-Min; Jin, Dal-Lae

2014-01-01

233

Electric Power Engineering Education Resources - 1979-80  

Microsoft Academic Search

This sixth biennial (1,2,3,4,5,6) committee report compiles the results of a survey of Electric Power Engineering Education Resources at ECPD\\/ABET (Engineers Council for Professional Development\\/Accreditation Board for Engineering anid Technology) accredited universities in the United States of America for the academic year 1979-80. The report contains a list of faculty active during the subject year, their level of academic participation

1981-01-01

234

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

PubMed

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

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

2014-07-01

235

THE AECL SYMPOSIUM ON ENGINEERING DEVELOPMENT IN NUCLEAR POWER  

SciTech Connect

Eleven papers and a final panel session summary are included in the conference proceedings. Paper titles are: Electrical power in Canada's future; Nuclear power in the next decade and AECL's program to meet it; The status of heat-transfer and fluid-dynamics research related to the Candu power reactor program; Mechanical engineering research and development in AECL; Isotope energy source development at commercial products; Extrusion of aluminum, uranium, and zirconium alloys at CRNL; The chemical engineer's role in nuclear-power-reaction design, development and operation; Chemical engineering research and development for fuel reprocessing and heavy-water production; Future reactor design criteria and how they can be met; Instrumentation and control; Accelerator research and engineering; and, the Panel session summary.

None

1971-11-15

236

Military Engineers: An Interagency Bridge Between Hard and Soft Power.  

National Technical Information Service (NTIS)

Military engineers, including not only the tactical units but departmental civilian and contracted capacity as well, are uniquely positioned to facilitate a comprehensive and strategic approach to allow the smoothest transition from hard to soft power. No...

L. F. Parrott

2010-01-01

237

Trends in high power laser applications in civil engineering  

Microsoft Academic Search

This paper reviews the research and development efforts made on the use of lasers for material processing in the civil engineering industry. Initial investigations regarding the possibility of using lasers in civil engineering were made in the 1960s and '70s, the target being rock excavation. At that time however, the laser powers available were too small for any practical application

Sivakumaran Wignarajah; Kenji Sugimoto; Kaori Nagai

2005-01-01

238

Tests Of A Stirling-Engine Power Converter  

NASA Technical Reports Server (NTRS)

Report describes acceptance tests of power converter consisting of pair of opposed free-piston Stirling engines driving linear alternators. Stirling engines offer potential for extremely long life, high reliability, high efficiency at low hot-to-cold temperature ratios, and relatively low heater-head temperatures.

Dochat, George

1995-01-01

239

SeqWare Query Engine: storing and searching sequence data in the cloud  

PubMed Central

Background Since the introduction of next-generation DNA sequencers the rapid increase in sequencer throughput, and associated drop in costs, has resulted in more than a dozen human genomes being resequenced over the last few years. These efforts are merely a prelude for a future in which genome resequencing will be commonplace for both biomedical research and clinical applications. The dramatic increase in sequencer output strains all facets of computational infrastructure, especially databases and query interfaces. The advent of cloud computing, and a variety of powerful tools designed to process petascale datasets, provide a compelling solution to these ever increasing demands. Results In this work, we present the SeqWare Query Engine which has been created using modern cloud computing technologies and designed to support databasing information from thousands of genomes. Our backend implementation was built using the highly scalable, NoSQL HBase database from the Hadoop project. We also created a web-based frontend that provides both a programmatic and interactive query interface and integrates with widely used genome browsers and tools. Using the query engine, users can load and query variants (SNVs, indels, translocations, etc) with a rich level of annotations including coverage and functional consequences. As a proof of concept we loaded several whole genome datasets including the U87MG cell line. We also used a glioblastoma multiforme tumor/normal pair to both profile performance and provide an example of using the Hadoop MapReduce framework within the query engine. This software is open source and freely available from the SeqWare project (http://seqware.sourceforge.net). Conclusions The SeqWare Query Engine provided an easy way to make the U87MG genome accessible to programmers and non-programmers alike. This enabled a faster and more open exploration of results, quicker tuning of parameters for heuristic variant calling filters, and a common data interface to simplify development of analytical tools. The range of data types supported, the ease of querying and integrating with existing tools, and the robust scalability of the underlying cloud-based technologies make SeqWare Query Engine a nature fit for storing and searching ever-growing genome sequence datasets.

2010-01-01

240

Low Power and Storage Efficient Parallel Lookup Engine Architecture for IP Packets  

NASA Astrophysics Data System (ADS)

Ternary Content-Addressable Memories are becoming very popular for designing high-throughput address lookup engines on routers: they are fast, cost-effective and simple to manage. Despite the TCAMs speed, their high power consumption is their major drawback.In this document, we designed a heuristic to match entries in TCAM stages so that only a bounded number of entries are looked up during the search operation.

Mahini, Alireza; Berangi, Reza; Mohtashami, Hossein; Mahini, Hamidreza

241

Heat engine development for solar thermal power systems  

NASA Technical Reports Server (NTRS)

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).

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

1981-01-01

242

MediAgent: a WWW-based scalable and self-learning medical search engine.  

PubMed Central

Searching for medical information on the Internet can be tedious and frustrating due to the number of irrelevant entries returned from generic search engines. We have developed MediAgent, a scalable search engine that aims to deliver a web-based medical search solution which is focused, exhaustive and able to keep improving its databases. The software package can run off a single low-end system and be scaled into a client-server, distributed computing architecture for high-end needs. This scalable architecture boosts MediAgent's handling capacity to tens of millions of web pages. In addition to large volume handling, MediAgent is designed to be manageable. All subsystems are not only highly configurable, but also support remote, interactive management and monitoring by the system administrator.

Tay, J.; Ke, S.; Lun, K. C.

1998-01-01

243

Global polar geospatial information service retrieval based on search engine and ontology reasoning  

USGS Publications Warehouse

In order to improve the access precision of polar geospatial information service on web, a new methodology for retrieving global spatial information services based on geospatial service search and ontology reasoning is proposed, the geospatial service search is implemented to find the coarse service from web, the ontology reasoning is designed to find the refined service from the coarse service. The proposed framework includes standardized distributed geospatial web services, a geospatial service search engine, an extended UDDI registry, and a multi-protocol geospatial information service client. Some key technologies addressed include service discovery based on search engine and service ontology modeling and reasoning in the Antarctic geospatial context. Finally, an Antarctica multi protocol OWS portal prototype based on the proposed methodology is introduced.

Chen, Nengcheng; E, Dongcheng; Di, Liping; Gong, Jianya; Chen, Zeqiang

2007-01-01

244

A cross-disciplinary technology transfer for search-based evolutionary computing: from engineering design to software engineering design  

NASA Astrophysics Data System (ADS)

Although object-oriented conceptual software design is difficult to learn and perform, computational tool support for the conceptual software designer is limited. In conceptual engineering design, however, computational tools exploiting interactive evolutionary computation (EC) have shown significant utility. This article investigates the cross-disciplinary technology transfer of search-based EC from engineering design to software engineering design in an attempt to provide support for the conceptual software designer. Firstly, genetic operators inspired by genetic algorithms (GAs) and evolutionary programming are evaluated for their effectiveness against a conceptual software design representation using structural cohesion as an objective fitness function. Building on this evaluation, a multi-objective GA inspired by a non-dominated Pareto sorting approach is investigated for an industrial-scale conceptual design problem. Results obtained reveal a mass of interesting and useful conceptual software design solution variants of equivalent optimality—a typical characteristic of successful multi-objective evolutionary search techniques employed in conceptual engineering design. The mass of software design solution variants produced suggests that transferring search-based technology across disciplines has significant potential to provide computationally intelligent tool support for the conceptual software designer.

Simons, C. L.; Parmee, I. C.

2007-07-01

245

Solar power satellites - Heat engine or solar cells  

NASA Technical Reports Server (NTRS)

A solar power satellite is the energy-converting element of a system that can deliver some 10 GW of power to utilities on the earth's surface. We evaluated heat engines and solar cells for converting sunshine to electric power at the satellite. A potassium Rankine cycle was the best of the heat engines, and 50 microns thick single-crystal silicon cells were the best of the photovoltaic converters. Neither solar cells nor heat engines had a clear advantage when all factors were considered. The potassium-turbine power plant, however, was more difficult to assemble and required a more expensive orbital assembly base. We therefore based our cost analyses on solar-cell energy conversion, concluding that satellite-generated power could be delivered to utilities for around 4 to 5 cents a kWh.

Oman, H.; Gregory, D. L.

1978-01-01

246

Full power level development of the Space Shuttle main engine  

NASA Technical Reports Server (NTRS)

Development of the Space Shuttle main engine for nominal operation at full power level (109 percent rated power) is continuing in parallel with the successful flight testing of the Space Transportation System. Verification of changes made to the rated power level configuration currently being flown on the Orbiter Columbia is in progress and the certification testing of the full power level configuration has begun. The certification test plan includes the accumulation of 10,000 seconds on each of two engines by early 1983. Certification testing includes the simulation of nominal mission duty cycles as well as the two abort thrust profiles: abort to orbit and return to launch site. Several of the certification tests are conducted at 111 percent power to demonstrate additional safety margins. In addition to the flight test and development program results, future plans for life demonstration and engine uprating will be discussed.

Johnson, J. R.; Colbo, H. I.

1982-01-01

247

Early experiences with a 3D model search engine  

Microsoft Academic Search

New acquisition and modeling tools make it easier to create 3D models, and affordable and powerful graphics hardware makes it easier to use them. As a result, the number of 3D models available on the web is increasing rapidly. However, it is still not as easy to find 3D models as it is to find, for example, text documents and

Patrick Min; John A. Halderman; Michael M. Kazhdan; Thomas A. Funkhouser

2003-01-01

248

HyPursuit: A hierarchical network search engine that exploits content-link hypertext clustering  

Microsoft Academic Search

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

England. Weiss London; B Sheldon; C. Nemprempre; P. Szilagyi; A. Duda; D. K. Gifford

1979-01-01

249

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

ERIC Educational Resources Information Center

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

Bradley, Phil

250

Reliability Verification of Search Engines' Hit Counts: How to Select a Reliable Hit Count for a Query  

Microsoft Academic Search

\\u000a In this paper, we investigate the trustworthiness of search engines’ hit counts, numbers returned as search result counts.\\u000a Since many studies adopt search engines’ hit counts to estimate the popularity of input queries, the reliability of hit counts\\u000a is indispensable for archiving trustworthy studies. However, hit counts are unreliable because they change, when a user clicks\\u000a the “Search” button more

Takuya Funahashi; Hayato Yamana

2010-01-01

251

Satellite nuclear power station: An engineering analysis  

NASA Technical Reports Server (NTRS)

A nuclear-MHD power plant system which uses a compact non-breeder reactor to produce power in the multimegawatt range is analyzed. It is shown that, operated in synchronous orbit, the plant would transmit power safely to the ground by a microwave beam. Fuel reprocessing would take place in space, and no radioactive material would be returned to earth. Even the effect of a disastrous accident would have negligible effect on earth. A hydrogen moderated gas core reactor, or a colloid-core, or NERVA type reactor could also be used. The system is shown to approach closely the ideal of economical power without pollution.

Williams, J. R.; Clement, J. D.; Rosa, R. J.; Kirby, K. D.; Yang, Y. Y.

1973-01-01

252

A geometry-based image search engine for advanced RADARSAT-1/2 GIS applications  

NASA Astrophysics Data System (ADS)

Space-borne Synthetic Aperture Radar (SAR) sensors, such as RADARSAT-1 and -2, enable a multitude of defense and security applications owing to their unique capabilities of cloud penetration, day/night imaging and multi-polarization imaging. As a result, advanced SAR image time series exploitation techniques such as Interferometric SAR (InSAR) and Radargrammetry are now routinely used in applications such as underground tunnel monitoring, infrastructure monitoring and DEM generation. Imaging geometry, as determined by the satellite orbit and imaged terrain, plays a critical role in the success of such techniques. This paper describes the architecture and the current status of development of a geometry-based search engine that allows the search and visualization of archived and future RADARSAT-1 and -2 images appropriate for a variety of advanced SAR techniques and applications. Key features of the search engine's scalable architecture include (a) Interactive GIS-based visualization of the search results; (b) A client-server architecture for online access that produces up-to-date searches of the archive images and that can, in future, be extended to acquisition planning; (c) A techniquespecific search mode, wherein an expert user explicitly sets search parameters to find appropriate images for advanced SAR techniques such as InSAR and Radargrammetry; (d) A future application-specific search mode, wherein all search parameters implicitly default to preset values according to the application of choice such as tunnel monitoring, DEM generation and deformation mapping; (f) Accurate baseline calculations for InSAR searches, and, optimum beam configuration for Radargrammetric searches; (g) Simulated quick look images and technique-specific sensitivity maps in the future.

Kotamraju, Vinay; Rabus, Bernhard; Busler, Jennifer

2012-05-01

253

Transporting submarine engines to power the PRT  

NASA Technical Reports Server (NTRS)

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.

1926-01-01

254

APPLICATION OF PATTERN SEARCH METHOD TO POWER SYSTEM ECONOMIC LOAD DISPATCH  

Microsoft Academic Search

Direct Search (DS) methods are evolutionary algorithms used to solve constrained optimization problems. DS methods do not require information about the gradient of the objective function while searching for an optimum solution. One of such methods is Pattern Search (PS) algorithm. This study examines the usefulness of a constrained pattern search algorithm to solve well-known power system Economic Load Dispatch

J S Alsumait; J K Sykulski; A K Alothman

255

Advanced Engine Control for Increasing Fuel Efficiency and Power Density While Reducing Observable Emissions From Military Diesel Engines.  

National Technical Information Service (NTIS)

Military diesel engines used in combat and tactical applications have their own specific engine control requirements that differ from those of commercial heavy-duty vehicles. The implementation of advanced engine control methods in diesel-powered military...

G. J. Thompson C. M. Atkinson N. N. Clark T. W. Long E. Hanzevack

2000-01-01

256

Engineers stretch power delivery systems with technology  

SciTech Connect

Efforts to increase electric power transmission capacity by four major distributors are described in the article. The Pennsylvania-Jersey-Maryland Power Pool restructuring for operation as an independent system operator is discussed, and equipment upgrades are briefly outlined. The Inex project of American Electric Power, which uses a unified power flow controller to operator a flexible alternating current transmission system (FACTS), is highlighted. Options being considered by Electricite de France are directed at making full use of existing resources; these include optimizing conductor alloy materials and shapes, operating at maximum conductor temperatures, and using FACTS technology to maintain voltages, adjust power flows, and improve network stability. Increasing capacity in the National Grid Company (NGC) system in the United Kingdom involves a combination of load sharing according to thermal capabilities. Technical considerations of NGCs measures to more evenly match load flows to line ratings are also discussed.

Beaty, W.

1996-09-01

257

75 FR 51987 - Birch Power Company and Sorenson Engineering; Birch Power Company and Sorenson Leasing L.L.C...  

Federal Register 2010, 2011, 2012, 2013

...No. 7194-030] Birch Power Company and Sorenson Engineering; Birch Power Company and Sorenson Leasing L.L.C.; Notice of Application...July 12, 2010, Birch Power Company and Sorenson Engineering (transferors) and Birch...

2010-08-24

258

Cost engineering of power plants with alkaline fuel cells  

Microsoft Academic Search

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

Olle Lindstrom; William Lavers

1997-01-01

259

The electrical power distribution system for the nonelectrical engineer  

Microsoft Academic Search

An attempt is made to introduce to the nonelectrical engineer the basic components and terminologies associated with a power distribution system and to present the needs such a system requires to remain safe and reliable. Particular reference is made to the power distribution system of a cement plant

Robert A. Haas; M. J. Klova

1991-01-01

260

A systematic review of statistical power in software engineering experiments  

Microsoft Academic Search

Abstract Statistical power is an inherent part of empirical studies that employ significance testing and is essential for the planning of studies, for the interpretation of study results, and for the validity of study conclusions. This paper reports a quantitative assessment of the statistical power of empirical software engineering research based on the 103 papers on controlled experiments (of a

Tore Dybå; Vigdis By Kampenes; Dag I. K. Sjøberg

2006-01-01

261

Efficiency at maximum power of thermally coupled heat engines.  

PubMed

We study the efficiency at maximum power of two coupled heat engines, using thermoelectric generators (TEGs) as engines. Assuming that the heat and electric charge fluxes in the TEGs are strongly coupled, we simulate numerically the dependence of the behavior of the global system on the electrical load resistance of each generator in order to obtain the working condition that permits maximization of the output power. It turns out that this condition is not unique. We derive a simple analytic expression giving the relation between the electrical load resistance of each generator permitting output power maximization. We then focus on the efficiency at maximum power (EMP) of the whole system to demonstrate that the Curzon-Ahlborn efficiency may not always be recovered: The EMP varies with the specific working conditions of each generator but remains in the range predicted by irreversible thermodynamics theory. We discuss our results in light of nonideal Carnot engine behavior. PMID:22680454

Apertet, Y; Ouerdane, H; Goupil, C; Lecoeur, Ph

2012-04-01

262

14 CFR 135.383 - Large transport category airplanes: Turbine engine powered: En route limitations: Two engines...  

Code of Federal Regulations, 2010 CFR

...false Large transport category airplanes: Turbine engine powered: En route...PERSONS ON BOARD SUCH AIRCRAFT Airplane Performance Operating Limitations...383 Large transport category airplanes: Turbine engine powered: En...

2009-01-01

263

CO2 laser-driven Stirling engine. [space power applications  

NASA Technical Reports Server (NTRS)

A 100-W Beale free-piston Stirling engine was powered remotely by a CO2 laser for long periods of time. The engine ran on both continuous-wave and pulse laser input. The working fluid was helium doped with small quantities of sulfur hexafluoride, SF6. The CO2 radiation was absorbed by the vibrational modes of the sulfur hexafluoride, which in turn transferred the energy to the helium to drive the engine. Electrical energy was obtained from a linear alternator attached to the piston of the engine. Engine pressures, volumes, and temperatures were measured to determine engine performance. It was found that the pulse radiation mode was more efficient than the continuous-wave mode. An analysis of the engine heat consumption indicated that heat losses around the cylinder and the window used to transmit the beam into the engine accounted for nearly half the energy input. The overall efficiency, that is, electrical output to laser input, was approximately 0.75%. However, this experiment was not designed for high efficiency but only to demonstrate the concept of a laser-driven engine. Based on this experiment, the engine could be modified to achieve efficiencies of perhaps 25-30%.

Lee, G.; Perry, R. L.; Carney, B.

1978-01-01

264

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

ERIC Educational Resources Information Center

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…

Mardis, Marcia

265

Searching for a Solution: Engineering tradeoffs and the evolution of provably secure protocols  

Microsoft Academic Search

Tradeoffs are an important part of engineering security. Protocol security is important. So are efficiency and cost. The paper provides an early framework for handling such aspects in a uniform way based on combinatorial optimisation techniques. BAN logic is viewed as both a specification and proof system and as a “protocol programming language”. The paper shows how evolutionary search in

John A. Clark; Jeremy L. Jacob

2000-01-01

266

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

PubMed Central

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.

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

267

Fuzzy logic and the Internet (FLINT): Internet, World Wide Web, and search engines  

Microsoft Academic Search

Retrieving relevant information is a crucial component of cased-based reasoning systems for Internet applications such as search engines. The task is to use user-defined queries to retrieve useful information according to certain measures. Even though techniques exist for locating exact matches, finding relevant partial matches might be a problem. It may not be also easy to specify query requests precisely

Masoud Nikravesh; Vincenzo Loia; Behnam Azvine

2002-01-01

268

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

ERIC Educational Resources Information Center

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…

Whiteside, Richard; Mentz, George S.

2003-01-01

269

A cognitive evaluation of four online search engines for answering definitional questions posed by physicians.  

PubMed

The Internet is having a profound impact on physicians' medical decision making. One recent survey of 277 physicians showed that 72% of physicians regularly used the Internet to research medical information and 51% admitted that information from web sites influenced their clinical decisions. This paper describes the first cognitive evaluation of four state-of-the-art Internet search engines: Google (i.e., Google and Scholar.Google), MedQA, Onelook, and PubMed for answering definitional questions (i.e., questions with the format of "What is X?") posed by physicians. Onelook is a portal for online definitions, and MedQA is a question answering system that automatically generates short texts to answer specific biomedical questions. Our evaluation criteria include quality of answer, ease of use, time spent, and number of actions taken. Our results show that MedQA outperforms Onelook and PubMed in most of the criteria, and that MedQA surpasses Google in time spent and number of actions, two important efficiency criteria. Our results show that Google is the best system for quality of answer and ease of use. We conclude that Google is an effective search engine for medical definitions, and that MedQA exceeds the other search engines in that it provides users direct answers to their questions; while the users of the other search engines have to visit several sites before finding all of the pertinent information. PMID:17990503

Yu, Hong; Kaufman, David

2007-01-01

270

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

Microsoft Academic Search

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

Jan Brophy; David Bawden

2005-01-01

271

A study of medical and health queries to web search engines.  

PubMed

This paper reports findings from an analysis of medical or health queries to different web search engines. We report results: (i). comparing samples of 10000 web queries taken randomly from 1.2 million query logs from the AlltheWeb.com and Excite.com commercial web search engines in 2001 for medical or health queries, (ii). comparing the 2001 findings from Excite and AlltheWeb.com users with results from a previous analysis of medical and health related queries from the Excite Web search engine for 1997 and 1999, and (iii). medical or health advice-seeking queries beginning with the word 'should'. Findings suggest: (i). a small percentage of web queries are medical or health related, (ii). the top five categories of medical or health queries were: general health, weight issues, reproductive health and puberty, pregnancy/obstetrics, and human relationships, and (iii). over time, the medical and health queries may have declined as a proportion of all web queries, as the use of specialized medical/health websites and e-commerce-related queries has increased. Findings provide insights into medical and health-related web querying and suggests some implications for the use of the general web search engines when seeking medical/health information. PMID:15023208

Spink, Amanda; Yang, Yin; Jansen, Jim; Nykanen, Pirrko; Lorence, Daniel P; Ozmutlu, Seda; Ozmutlu, H Cenk

2004-03-01

272

A New Era of Search Engines: Not Just Web Pages Anymore.  

ERIC Educational Resources Information Center

Discusses various types of information that can be retrieved from the Web via search engines. Highlights include Web pages; time frames, including historical coverage and currentness; text pages in formats other than HTML; directory sites; news articles; discussion groups; images; and audio and video. (LRW)

Hock, Ran

2002-01-01

273

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

Microsoft Academic Search

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

Massimo Marchiori

1997-01-01

274

A Technique for Measuring the Relative Size and Overlap of Public Web Search Engines  

Microsoft Academic Search

Search engines are among the most useful and popular services on the Web. Users are eager to know how they compare. Which one has the largest coverage? Have they indexed the same portion of the Web? How many pages are out there? Although these questions have been debated in the popular and technical press, no objective evaluation methodology has been

Krishna Bharat; Andrei Z. Broder

1998-01-01

275

Internet Visibility Measured by Search Engine Hits: A Test on Virginia Colleges and Universities.  

ERIC Educational Resources Information Center

This study selected 25 private colleges and universities and 14 public colleges and universities in Virginia. Internet search engines were used to record the number of hits they reported for each of the schools, as a measure of the institution's visibility in the Internet world. Findings indicated that there was a high correlation between…

Ridley, Dennis R.

276

Attitudes toward search engines as a learning assisted tool: approach of Liaw and Huang's research model  

Microsoft Academic Search

The purpose of this research is to develop new approach to investigate individual attitudes toward search engines as a learning assisted tool. This research is based on Liaw and Huang’s research model that included motivation perspective, social cognitive theory, and technology acceptance model. After factor analysis and regression analysis, the results show that the factor of perceived satisfaction of system’s

Shu-Sheng Liaw; Weng-Cheng Chang; Wu-Hsiung Hung; Hsiu-Mei Huang

2006-01-01

277

An Analysis of Document Viewing Patterns of Web Search Engine Users  

Microsoft Academic Search

This chapter reviews the concepts of Web results page and Web page viewing patterns by users of Web search engines. It presents the advantages of using traditional transaction log analysis in identifying these patterns, serving as a basis for Web usage mining. The authors also present the results of a temporal of analysis of Web page viewing illustrating that the

Bernard J. Jansen; Amanda Spink

278

Efficient Solving of Engineering Design Problems by an Interior Point 3-D Filter Line Search Method  

NASA Astrophysics Data System (ADS)

Here we present an interior point three-D filter line search method for solving optimization problems. Each entry in the filter includes the feasibility measure, the centrality measure and the barrier objective function value. The algorithm is tested with benchmark engineering design problems, and a comparison with other published results are also included.

Costa, M. Fernanda P.; Fernandes, Edite M. G. P.

2008-09-01

279

A Thermoelectric Generator Using Engine Coolant for Light-Duty Internal Combustion Engine-Powered Vehicles  

NASA Astrophysics Data System (ADS)

We proposed and fabricated a thermoelectric generator (TEG) using the engine water coolant of passenger vehicles. The experimental results revealed that the maximum output power from the proposed thermoelectric generator was ~75 W, the calculated thermoelectric module efficiency of the TEG was ~2.1%, and the overall efficiency of electric power generation from the waste heat of the engine coolant was ~0.3% in the driving mode at 80 km/h. The conventional radiator can thus be replaced by the proposed TEG without additional devices or redesign of the engine water cooling system of the existing radiator.

Kim, Shiho; Park, Soonseo; Kim, Sunkook; Rhi, Seok-Ho

2011-05-01

280

Fast search for transmission section based on power component of line  

Microsoft Academic Search

This paper proposes an algorithm fast searching for key transmission section based on power component of line. Firstly, graph theory is used to calculate the real power transfer among individual generators and loads, then classify the lines based on the Ward's cluster analysis method to search the set of lines which have the similar power component to overload line, finally

Linyan Cheng; Baohui Zhang; Guanghui Li; Jin Wang; Zhiqian Bo; Tony Yip; David Writer; Yu Sun

2011-01-01

281

Engineering services to support operating nuclear power plants  

SciTech Connect

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, and procurement of new equipment and systems in addition to upgrading existing systems. This resulted in many multi-million dollar projects and several special issues such as Equipment Qualification and Appendix R, Fire Protection. These large projects have now been installed and most of the special regulatory issues resolved. The need for contract engineering services has shifted to the areas of equipment performance and reliability, piping analysis, and staff augmentation. With the projected lower demands for electricity and tighter budget controls, the trend for these types of engineering services is expected to continue over the next few years.

Pendergrass, M.L.

1985-11-01

282

Engineering a novel self-powering electrochemical biosensor  

Microsoft Academic Search

This paper records the efforts of a multi-disciplinary team of undergraduate students from Glasgow University to collectively\\u000a design and carry out a 10 week project in Synthetic Biology as part of the international Genetic Engineered Machine competition\\u000a (iGEM). The aim of the project was to design and build a self-powering electrochemical biosensor called ‘ElectrEcoBlu’. The\\u000a novelty of this engineered machine lies

X. Gu; M. Trybi?o; S. Ramsay; M. Jensen; R. Fulton; S. Rosser; D. Gilbert

2010-01-01

283

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

284

Solar powered free-piston stirling engine  

SciTech Connect

A method of controlling the operation of a free piston Stirling engine including a displacer piston having an integral electrical linear driver, an alternator piston driven by the displacer piston and including means for generating an electric current and variable volume gas springs in the cylinders for the displacer and alternator piston is described comprising the steps of: sensing the output voltage if the generated electric current; controlling the movement of the displacer piston by varying the volume of the gas spring in the displacer cylinder and the status of linear driver responsively to the sensed output voltage; sensing the frequency of the linear driver responsively to the sensed output voltage; sensing the frequency of the alternator piston; and controlling the frequency of the alternator piston by varying the volume of the gas spring of the alternator cylinder responsive to the sensed frequency.

Benson, G.M.

1988-05-24

285

An improved harmony search algorithm for power economic load dispatch  

Microsoft Academic Search

A meta-heuristic algorithm called harmony search (HS), mimicking the improvisation process of music players, has been recently developed. The HS algorithm has been successful in several optimization problems. The HS algorithm does not require derivative information and uses stochastic random search instead of a gradient search. In addition, the HS algorithm is simple in concept, few in parameters, and easy

Leandro dos Santos Coelho; Viviana Cocco Mariani

2009-01-01

286

How does our search engine "see" the world? The case of amodal completion  

PubMed Central

This article illustrates a dissociation between the perceived attributes of an object and the ability of those attributes to guide the deployment of attention in visual search. Orientation is an attribute that guides search. Thus, a vertical line will “pop out” amid horizontal distractors. Amodal completion can create perceptually convincing oriented stimuli when two elements appear to form a complete object partially hidden behind an occluder. Previous work (e.g., Rensink & Enns, Vision Research, 38, 2489–2505, 1998) has shown a preattentive role for amodal completion in search tasks. Here, we show that orientation based on perceptually compelling amodal completion may fail to guide attention. The broader conclusion is that introspection is a poor guide to the capabilities of our internal search engine.

Reijnen, Ester; Horowitz, Todd S.; Pedersini, Riccardo; Pinto, Yair; Hulleman, Johan

2011-01-01

287

Power control system for a hot gas engine  

DOEpatents

A power control system for a hot gas engine of the type in which the power output is controlled by varying the mean pressure of the working gas charge in the engine has according to the present invention been provided with two working gas reservoirs at substantially different pressure levels. At working gas pressures below the lower of said levels the high pressure gas reservoir is cut out from the control system, and at higher pressures the low pressure gas reservoir is cut out from the system, thereby enabling a single one-stage compressor to handle gas within a wide pressure range at a low compression ratio.

Berntell, John O. (Staffanstorp, SE)

1986-01-01

288

Start Your Search Engines. Part 2: When Image is Everything, Here are Some Great Ways to Find One  

ERIC Educational Resources Information Center

There is no doubt that Google is great for finding images. Simply head to its home page, click the "Images" link, enter criteria in the search box, and--voila! In this article, the authors share some of their other favorite search engines for finding images. To make sure the desired images are available for educational use, consider searching for…

Adam, Anna; Mowers, Helen

2008-01-01

289

Duke Engineering explores huge African Power Project  

SciTech Connect

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.

Newman, P.

1994-10-14

290

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

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

Eysenbach, G; Kohler, Ch

2003-01-01

291

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

ERIC Educational Resources Information Center

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…

Chanson, Hubert

2007-01-01

292

Satellite power system: Engineering and economic analysis summary  

NASA Technical Reports Server (NTRS)

A system engineering and economic analysis was conducted to establish typical reference baselines for the photovoltaic, solar thermal, and nuclear satellite power systems. Tentative conclusions indicate that feasibility and economic viability are characteristic of the Satellite Power System. Anticipated technology related to manufacturing, construction, and maintenance operations is described. Fuel consumption, environmental effects, and orbital transfer are investigated. Space shuttles, local space transportation, and the heavy lift launch vehicle required are also discussed.

1976-01-01

293

Maximum-power quantum-mechanical Carnot engine.  

PubMed

In their work [J. Phys. A 33, 4427 (2000)], Bender, Brody, and Meister have shown by employing a two-state model of a particle confined in the one-dimensional infinite potential well that it is possible to construct a quantum-mechanical analog of the Carnot engine through changes of both the width of the well and the quantum state in a specific manner. Here, a discussion is developed about realizing the maximum power of such an engine, where the width of the well moves at low but finite speed. The efficiency of the engine at the maximum power output is found to be universal independently of any of the parameters contained in the model. PMID:21599125

Abe, Sumiyoshi

2011-04-01

294

Space Power Demonstration Engine linear alternator dynamometer test results  

Microsoft Academic Search

To verify the alternator bench test and finite element code results, it was decided to test the Space Power Demonstration Engine (SPDE) alternator on a linear dynamometer. The dynamometer tests confirmed that the primary source of losses in the SPDE alternator assembly was the adjacent magnetic structure and not the alternator proper. Alternator efficiency above 90% was demonstrated by substitution

M. Dhar; J. Rauch; S. Huang; R. Bolton

1989-01-01

295

Nitinol Heat Engine power plant system installation and cost optimization  

Microsoft Academic Search

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

E. C. Cady; J. L. McNichols

1984-01-01

296

Cyber-Physical Systems Engineering: The Advanced Power Grid  

Microsoft Academic Search

Cyber-Physical (CP) systems must address engineering domains such as automotive, petrochemical, aerospace, manufacturing, civil infrastructure, and medical device systems, with an eye to how the fault tolerance, security, decentralized control, and social aspects of these systems influence their design. Bulk power transmission systems are one such CP system and form a rich environment for the study of several inherent problems.

B. McMillin; C. Gill; M. L. Crow; F. Liu; D. Niehaus; A. Potthast; D. Tauritz

297

CrossSearch, a user-friendly search engine for detecting chemically cross-linked peptides in conjugated proteins.  

PubMed

Chemical cross-linking and high resolution MS have been integrated successfully to capture protein interactions and provide low resolution structural data for proteins that are refractive to analyses by NMR or crystallography. Despite the versatility of these combined techniques, the array of products that is generated from the cross-linking and proteolytic digestion of proteins is immense and generally requires the use of labeling strategies and/or data base search algorithms to distinguish actual cross-linked peptides from the many side products of cross-linking. Most strategies reported to date have focused on the analysis of small cross-linked protein complexes (<60 kDa) because the number of potential forms of covalently modified peptides increases dramatically with the number of peptides generated from the digestion of such complexes. We report herein the development of a user-friendly search engine, CrossSearch, that provides the foundation for an overarching strategy to detect cross-linked peptides from the digests of large (>or=170-kDa) cross-linked proteins, i.e. conjugates. Our strategy combines the use of a low excess of cross-linker, data base searching, and Fourier transform ion cyclotron resonance MS to experimentally minimize and theoretically cull the side products of cross-linking. Using this strategy, the (alpha beta gamma delta)(4) phosphorylase kinase model complex was cross-linked to form with high specificity a 170-kDa betagamma conjugate in which we identified residues involved in the intramolecular cross-linking of the 125-kDa beta subunit between its regulatory N terminus and its C terminus. This finding provides an explanation for previously published homodimeric two-hybrid interactions of the beta subunit and suggests a dynamic structural role for the regulatory N terminus of that subunit. The results offer proof of concept for the CrossSearch strategy for analyzing conjugates and are the first to reveal a tertiary structural element of either homologous alpha or beta regulatory subunit of phosphorylase kinase. PMID:18281724

Nadeau, Owen W; Wyckoff, Gerald J; Paschall, Justin E; Artigues, Antonio; Sage, Jessica; Villar, Maria T; Carlson, Gerald M

2008-04-01

298

Development of a large-scale web crawler and search engine infrastructure  

Microsoft Academic Search

This paper reports the ongoing development of a large-scale Web crawler and search engine infrastructure at National Institute of Information and Communications Technology. This infrastructure has the following characteristics: (1) It collects one billion Japanese Web pages while keeping them up-to-date. (2) It selects 100 million pages from among the collected pages and converts them into a standard data format

Susumu Akamine; Yoshikiyo Kato; Daisuke Kawahara; Keiji Shinzato; Kentaro Inui; Sadao Kurohashi; Yutaka Kidawara

2009-01-01

299

A Combined Genetic Adaptive Search (GeneAS) for Engineering Design  

Microsoft Academic Search

In this paper, a flexible yet efficient algorithm for solving engineering design optimizationproblems is presented. The algorithm is developed based on both binary-coded and realcodedgenetic algorithms (GAs). Since both GAs are used, the variables involving discrete,continuous, and zero-one variables are handled quite efficiently. The algorithm restricts itssearch only to the permissible values of the variables, thereby reducing the search effort

Kalyanmoy Deb; Mayank Goyal

1996-01-01

300

What's new on the web?: the evolution of the web from a search engine perspective  

Microsoft Academic Search

We seek to gain improved insight into how Web search engines shouldcope with the evolving Web, in an attempt to provide users with themost up-to-date results possible. For this purpose we collectedweekly snapshots of some 150 Web sites over the course of one year,and measured the evolution of content and link structure. Our measurements focus on aspects of potential interest

Alexandros Ntoulas; Junghoo Cho; Christopher Olston

2004-01-01

301

Search Engines and Expertise about Global Issues: Well-defined Landscape or Undomesticated Wilderness?  

Microsoft Academic Search

This chapter investigates the ‘winner-takes-all’ hypothesis in relation to how academic researchers access online sources\\u000a and resources. Some have argued that the Web provides access to a wider range of sources of information than offline resources.\\u000a Others, such as Hindman et al. (2003), have shown that access to online resources is highly concentrated, particularly because\\u000a of how Internet search engines

J. Fry; S. Virkar; R. Schroeder

2008-01-01

302

Go3R - semantic Internet search engine for alternative methods to animal testing.  

PubMed

Consideration and incorporation of all available scientific information is an important part of the planning of any scientific project. As regards research with sentient animals, EU Directive 86/609/EEC for the protection of laboratory animals requires scientists to consider whether any planned animal experiment can be substituted by other scientifically satisfactory methods not entailing the use of animals or entailing less animals or less animal suffering, before performing the experiment. Thus, collection of relevant information is indispensable in order to meet this legal obligation. However, no standard procedures or services exist to provide convenient access to the information required to reliably determine whether it is possible to replace, reduce or refine a planned animal experiment in accordance with the 3Rs principle. The search engine Go3R, which is available free of charge under http://Go3R.org, runs up to become such a standard service. Go3R is the world-wide first search engine on alternative methods building on new semantic technologies that use an expert-knowledge based ontology to identify relevant documents. Due to Go3R's concept and design, the search engine can be used without lengthy instructions. It enables all those involved in the planning, authorisation and performance of animal experiments to determine the availability of non-animal methodologies in a fast, comprehensive and transparent manner. Thereby, Go3R strives to significantly contribute to the avoidance and replacement of animal experiments. PMID:19326030

Sauer, Ursula G; Wächter, Thomas; Grune, Barbara; Doms, Andreas; Alvers, Michael R; Spielmann, Horst; Schroeder, Michael

2009-01-01

303

Hydra: a scalable proteomic search engine which utilizes the Hadoop distributed computing framework  

PubMed Central

Background For shotgun mass spectrometry based proteomics the most computationally expensive step is in matching the spectra against an increasingly large database of sequences and their post-translational modifications with known masses. Each mass spectrometer can generate data at an astonishingly high rate, and the scope of what is searched for is continually increasing. Therefore solutions for improving our ability to perform these searches are needed. Results We present a sequence database search engine that is specifically designed to run efficiently on the Hadoop MapReduce distributed computing framework. The search engine implements the K-score algorithm, generating comparable output for the same input files as the original implementation. The scalability of the system is shown, and the architecture required for the development of such distributed processing is discussed. Conclusion The software is scalable in its ability to handle a large peptide database, numerous modifications and large numbers of spectra. Performance scales with the number of processors in the cluster, allowing throughput to expand with the available resources.

2012-01-01

304

GoWeb: a semantic search engine for the life science web  

PubMed Central

Background Current search engines are keyword-based. Semantic technologies promise a next generation of semantic search engines, which will be able to answer questions. Current approaches either apply natural language processing to unstructured text or they assume the existence of structured statements over which they can reason. Results Here, we introduce a third approach, GoWeb, which combines classical keyword-based Web search with text-mining and ontologies to navigate large results sets and facilitate question answering. We evaluate GoWeb on three benchmarks of questions on genes and functions, on symptoms and diseases, and on proteins and diseases. The first benchmark is based on the BioCreAtivE 1 Task 2 and links 457 gene names with 1352 functions. GoWeb finds 58% of the functional GeneOntology annotations. The second benchmark is based on 26 case reports and links symptoms with diseases. GoWeb achieves 77% success rate improving an existing approach by nearly 20%. The third benchmark is based on 28 questions in the TREC genomics challenge and links proteins to diseases. GoWeb achieves a success rate of 79%. Conclusion GoWeb's combination of classical Web search with text-mining and ontologies is a first step towards answering questions in the biomedical domain. GoWeb is online at:

Dietze, Heiko; Schroeder, Michael

2009-01-01

305

Variable-Speed Engine Generator With Supercapacitor: Isolated Power Generation System and Fuel Efficiency  

Microsoft Academic Search

A variable-speed engine generator set for an isolated power system is investigated due to reduced fuel consumption and less emission. However, because of the sluggish dynamic behavior of the internal combustion engine, the power quality would be degraded during the sudden load power surge, where the power required by the load is not available by the engine because of the

Joon-Hwan Lee; Seung-Hwan Lee; Seung-Ki Sul

2009-01-01

306

Trends in high power laser applications in civil engineering  

NASA Astrophysics Data System (ADS)

This paper reviews the research and development efforts made on the use of lasers for material processing in the civil engineering industry. Initial investigations regarding the possibility of using lasers in civil engineering were made in the 1960s and '70s, the target being rock excavation. At that time however, the laser powers available were too small for any practical application utilization. In the 1980's, the technology of laser surface cleaning of historically important structures was developed in Europe. In the early 1990s, techniques of laser surface modification, including glazing and coloring of concrete, roughening of granite stones, carbonization of wood were pursued, mainly in Japan. In the latter part of the decade, techniques of laser decontamination of concrete surfaces in nuclear facilities were developed in many countries, and field tests were caried out in Japan. The rapid advances in development of diode lasers and YAG lasers with high power outputs and efficiencies since the late 1990's have led to a revival of worldwide interest in the use of lasers for material processing in civil engineering. The authors believe that, in the next 10 years or so, the advent of compact high power lasers is likely to lead to increased use of lasers of material processing in the field of civil engineering.

Wignarajah, Sivakumaran; Sugimoto, Kenji; Nagai, Kaori

2005-03-01

307

Track Search of the Platform Simulating the Tank Engine's Movement State  

Microsoft Academic Search

The platform is a test-equipment which is used to simulate the tank engine's movement state when the tank runs on the road. A multi-branches parallel manipulator with redundant branches driven by hydraulic power is adopted, which can meet the requirements of heavy load, high agility and complicated movement. Because of the peculiar structure of the system, the study introduced an

Lipeng Yuan; Hongying Lu; Keding Zhao

2006-01-01

308

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

PubMed Central

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.

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

2013-01-01

309

Safety issues in SSTO spacecraft powered by antimatter rocket engines  

NASA Astrophysics Data System (ADS)

Safety issues related to operating an antimatter-powered spacecraft in the atmosphere are examined. Radiation danger from the high-energy gamma radiation produced by the annihilation reaction, radioactivity induced in the rocket engine because of photonuclear interactions between gamma radiation and shield nuclei, and antimatter containment failure are discussed in detail. The dangers to the public and the crew and payload are then quantified. An engine design reducing the risks associated with operation in the atmosphere is proposed, and its performance is assessed by calculating the temperature profile and the heat transfer to hydrogen as it flows through the tungsten shell structure of the engine. It is noted that the requirement for shielding and the state of magnet technology dictate a radiation shield of enormous mass and, as designed, the booster would not be reusable and the mass of tungsten lost.

Tarpley, Christopher; Lewis, Mark J.; Kothari, Ajay

1990-07-01

310

Prediction of automotive engine power and torque using least squares support vector machines and Bayesian inference  

Microsoft Academic Search

Automotive engine power and torque are significantly affected with effective tune-up. Current practice of engine tune-up relies on the experience of the automotive engineer. The engine tune-up is usually done by trial-and-error method, and then the vehicle engine is run on the dynamometer to show the actual engine output power and torque. Obviously, the current practice costs a large amount

Chi-Man Vong; Pak-Kin Wong; Yi-Ping Li

2006-01-01

311

Efficiency at maximum power of a chemical engine  

NASA Astrophysics Data System (ADS)

A cyclically operating chemical engine is considered that converts chemical energy into mechanical work. The working fluid is a gas of finite-sized spherical particles interacting through elastic hard collisions. For a generic transport law for particle uptake and release, the efficiency at maximum power ?mp takes the form 1/2+c ??+(??2), with 1/2 a universal constant and ?? the chemical potential difference between the particle reservoirs. The linear coefficient c is zero for engines featuring a so-called left/right symmetry or particle fluxes that are antisymmetric in the applied chemical potential difference. Remarkably, the leading constant in ?mp is non-universal with respect to an exceptional modification of the transport law. For a nonlinear transport model, we obtain ?mp, with ? > 0 the power of ?? in the transport equation.

Hooyberghs, Hans; Cleuren, Bart; Salazar, Alberto; Indekeu, Joseph O.; Van den Broeck, Christian

2013-10-01

312

Design of a Micro Reciprocating Engine for Power Generation  

NASA Astrophysics Data System (ADS)

A reciprocating engine was designed for a micro power generator. It is expected to be used for a portable micro power generator with high energy density. The proposed reciprocating engine has the spring system, which is composed of opposite-pistons supported by an elastic spring. Combination of resonance of the spring system by the combustion pressure and an induction coil generates electricity due to generated voltage. Working cycle analysis, structural analysis, vibration analysis, and generated voltage calculations were carried out. Adopting H2 gas as a fuel and Si as a structural material, the theoretical output was found to be 41 mW under the conditions that compression ratio is 5, the maximum combustion temperature is 850 K and resonance frequency of the spring system is 582 Hz.

Sugiyama, Susumu; Toriyama, Toshiyuki

313

Conceptual design of single turbofan engine powered light aircraft  

NASA Technical Reports Server (NTRS)

The conceptual design of a four place single turbofan engine powered light aircraft was accomplished utilizing contemporary light aircraft conventional design techniques as a means of evaluating the NASA-Ames General Aviation Synthesis Program (GASP) as a preliminary design tool. In certain areas, disagreement or exclusion were found to exist between the results of the conventional design and GASP processes. Detail discussion of these points along with the associated contemporary design methodology are presented.

Snyder, F. S.; Voorhees, C. G.; Heinrich, A. M.; Baisden, D. N.

1977-01-01

314

Magnetohydrodynamics (MHD) Engineering Test Facility (ETF) 200 MWe power plant  

SciTech Connect

A description and the design requirements for the 200 MWe (nominal) net output MHD Engineering Test Facility (ETF) Conceptual Design are presented. Performance requirements for the plant are identified and process conditions are indicated at interface stations between the major systems comprising the plant. Also included are the description, functions, interfaces and requirements for each of these major systems. This report integrates the latest information (1980 to 1981) from the MHD technology program with elements of a conventional steam electric power generating plant.

Rigo, H.S.; Bercaw, R.W.; Burkhart, J.A.; Mroz, T.S.; Bents, D.J.; Hatch, A.M.

1981-09-01

315

Heat engine requirements for advanced solar thermal power systems  

NASA Technical Reports Server (NTRS)

Requirements and constraints are established for power conversion subsystems, including heat engine, alternator and auxiliaries, of dish concentrator solar thermal power systems. In order to be competitive with conventional power systems, it is argued that the heat engine should be of less than 40 kW rated output, in a subsystem with an efficiency of at least 40% at rated output and at least 37% at half power. An interval between major overhauls of 50,000 hours is also desirable, along with minor maintenance and lubrication not more than four times a year requiring no more than one man-hour each time, and optimal reliability. Also found to be important are the capability for hybrid operation using heat from a solar receiver, fuel-fired combustor or both simultaneously, operation at any attitude, stability to transients in input power and output loading, operation at ambient temperatures from -30 to 50 C, and compatibility with environmental and safety requirements. Cost targets include a price of $180/kWe, and operation, maintenance and replacement costs averaging $0.001/kWh for 30 years of operation.

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

1981-01-01

316

A review on the aviation piston engine power assembly for the air cushion boat  

NASA Astrophysics Data System (ADS)

The aviation piston engine has a suitable power rating. The weight of the air cushion boat developed early was rather small, mostly ranging from 2 to 4 tons. The power rating of the air cushion boat is about 100 to 135 horsepower/ton. According to this, a single engine's power rating ranges from 200 to 500 horsepower. It is well known that this is exactly the most common power rating of an aviation piston engine (and an air-cooled diesel engine).

Jianzhang, Zhu

1986-09-01

317

Advanced 35 W Free-Piston Stirling Engine for Space Power Applications  

NASA Astrophysics Data System (ADS)

This paper presents the projected performance and overall design characteristics of a high efficiency, low mass 35 W free-piston Stirling engine design. Overall (engine plus linear alternator) thermodynamic performance greater than 50% of Carnot, with a specific power close to 100 W/kg appears to be a reasonable goal at this small power level. Supporting test data and analysis results from exiting engines are presented. Design implications of high specific power in relatively low power engines is presented and discussed.

Wood, J. Gary; Lane, Neill

2003-01-01

318

Is It "Writing on Water" or "Strike It Rich?" The Experiences of Prospective Teachers in Using Search Engines  

ERIC Educational Resources Information Center

Information searching skills have become increasingly important for prospective teachers with the exponential growth of learning materials on the web. This study is an attempt to understand the experiences of prospective teachers with search engines through metaphoric images and to further investigate whether their experiences are related to the…

Sahin, Abdurrahman; Cermik, Hulya; Dogan, Birsen

2010-01-01

319

14 CFR 121.189 - Airplanes: Turbine engine powered: Takeoff limitations.  

Code of Federal Regulations, 2010 CFR

...b) No person operating a turbine engine powered airplane...c) No person operating a turbine engine powered airplane certificated...d) No person operating a turbine engine powered airplane may...the ambient temperature and wind component at the time...

2009-01-01

320

14 CFR 121.189 - Airplanes: Turbine engine powered: Takeoff limitations.  

Code of Federal Regulations, 2010 CFR

...b) No person operating a turbine engine powered airplane...c) No person operating a turbine engine powered airplane certificated...d) No person operating a turbine engine powered airplane may...the ambient temperature and wind component at the time...

2010-01-01

321

14 CFR 135.379 - Large transport category airplanes: Turbine engine powered: Takeoff limitations.  

Code of Federal Regulations, 2010 CFR

...b) No person operating a turbine engine powered large transport...c) No person operating a turbine engine powered large transport...d) No person operating a turbine engine powered large transport...the ambient temperature and wind component at the time...

2009-01-01

322

Antiproton powered propulsion with magnetically confined plasma engines  

NASA Technical Reports Server (NTRS)

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 propellant, which is then exhausted through one end of the pulsed mirror system to provide thrust. The calculated energy transfer efficiencies for a low number density (10(14)/cu cm) hydrogen propellant are insufficient to warrant operating the engine in this mode. Efficiencies are improved using moderate propellant number densities (10(16)/cu cm), but the energy transferred to the plasma in a realistic magnetic mirror system is generally limited to less than 2 percent of the initial proton-antiproton annihilation energy. The energy transfer efficiencies are highest for high number density (10(18)/cu cm) propellants, but plasma temperatures are reduced by excessive radiation losses. Low to moderate thrust over a wide range of specific impulse can be generated with moderate propellant number densities, while higher thrust but lower specific impulse may be generated using high propellant number densities. Significant mass will be required to shield the superconducting magnet coils from the high energy gamma radiation emitted by neutral pion decay. The mass of such a radiation shield may dominate the total engine mass, and could severely diminish the performance of antiproton powered engines which utilize magnetic confinement. The problem is compounded in the antiproton powered plasma engine, where lower energy plasma bremsstrahlung radiation may cause shield surface ablation and degradation.

Lapointe, Michael R.

1989-01-01

323

Characterizing the time-perspective of nations with search engine query data.  

PubMed

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

Noguchi, Takao; Stewart, Neil; Olivola, Christopher Y; Moat, Helen Susannah; Preis, Tobias

2014-01-01

324

Characterizing the Time-Perspective of Nations with Search Engine Query Data  

PubMed Central

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.

Noguchi, Takao; Stewart, Neil; Olivola, Christopher Y.; Moat, Helen Susannah; Preis, Tobias

2014-01-01

325

Magnetohydrodynamics (MHD) Engineering Test Facility (ETF) 200 MWe power plant. Conceptual Design Engineering Report (CDER). Volume 4: Supplementary engineering data  

NASA Technical Reports Server (NTRS)

The reference conceptual design of the Magnetohydrodynamic Engineering Test Facility (ETF), a prototype 200 MWe coal-fired electric generating plant designed to demonstrate the commercial feasibility of open cycle MHD is summarized. Main elements of the design are identified and explained, and the rationale behind them is reviewed. Major systems and plant facilities are listed and discussed. Construction cost and schedule estimates, and identification of engineering issues that should be reexamined are also given. The latest (1980-1981) information from the MHD technology program are integrated with the elements of a conventional steam power electric generating plant. Supplementary Engineering Data (Issues, Background, Performance Assurance Plan, Design Details, System Design Descriptions and Related Drawings) is presented.

1981-01-01

326

Engineering design aspects of the heat-pipe power system  

SciTech Connect

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.

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

1997-10-01

327

A Historical and Engineering View of Power Transmission Systems in Kansai Electric Power Co., Inc.  

NASA Astrophysics Data System (ADS)

During our work in operations related to power transmission technology, we have encountered various natural calamities and man-made disasters. Over the years, we learned many valuable lessons from these bitter experiences, and we now have more reliable, cost-effective and flexible electric power systems. This paper describes the new technologies we have introduced in the facilities making up the power systems and how we operate these systems and facilities. It also takes up the Southern Hyogo Earthquake and loss of Ohi nuclear power generation due to galloping phenomena as typical examples showing how a set of measures as mentioned above substantially improved the reliability of the electric power systems to such an extent that the Japanese electric power systems have attained the world's highest level of reliability. These facts prove that steady and continuous efforts are a prerequisite to success for all power engineers.

Ito, Shunichi; Akiyama, Tetsuo

328

Magnetohydrodynamics (MHD) Engineering Test Facility (ETF) 200 MWe power plant Conceptual Design Engineering Report (CDER)  

NASA Technical Reports Server (NTRS)

The reference conceptual design of the magnetohydrodynamic (MHD) Engineering Test Facility (ETF), a prototype 200 MWe coal-fired electric generating plant designed to demonstrate the commercial feasibility of open cycle MHD, is summarized. Main elements of the design, systems, and plant facilities are illustrated. System design descriptions are included for closed cycle cooling water, industrial gas systems, fuel oil, boiler flue gas, coal management, seed management, slag management, plant industrial waste, fire service water, oxidant supply, MHD power ventilating

1981-01-01

329

Discovery of gigantic molecular nanostructures using a flow reaction array as a search engine  

NASA Astrophysics Data System (ADS)

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.

Zang, Hong-Ying; de La Oliva, Andreu Ruiz; Miras, Haralampos N.; Long, De-Liang; McBurney, Roy T.; Cronin, Leroy

2014-04-01

330

Discovery of gigantic molecular nanostructures using a flow reaction array as a search engine.  

PubMed

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 [Mo(2)O(2)S(2)](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, {Mo(10)(C5)}; 2, {Mo(14)(C4)4(C5)2}; 3, {Mo(60)(C4)10}; 4, {Mo(48)(C4)6}; 5, {Mo(34)(C4)4}; 6, {Mo(18)(C4)9}; in only 200 automated experiments from a parameter space spanning ~5 million possible combinations. PMID:24770632

Zang, Hong-Ying; de la Oliva, Andreu Ruiz; Miras, Haralampos N; Long, De-Liang; McBurney, Roy T; Cronin, Leroy

2014-01-01

331

An adaptive knowledge-driven medical image search engine for interactive diffuse parenchymal lung disease quantification  

NASA Astrophysics Data System (ADS)

Characterization and quantification of the severity of diffuse parenchymal lung diseases (DPLDs) using Computed Tomography (CT) is an important issue in clinical research. Recently, several classification-based computer-aided diagnosis (CAD) systems [1-3] for DPLD have been proposed. For some of those systems, a degradation of performance [2] was reported on unseen data because of considerable inter-patient variances of parenchymal tissue patterns. We believe that a CAD system of real clinical value should be robust to inter-patient variances and be able to classify unseen cases online more effectively. In this work, we have developed a novel adaptive knowledge-driven CT image search engine that combines offline learning aspects of classification-based CAD systems with online learning aspects of content-based image retrieval (CBIR) systems. Our system can seamlessly and adaptively fuse offline accumulated knowledge with online feedback, leading to an improved online performance in detecting DPLD in both accuracy and speed aspects. Our contribution lies in: (1) newly developed 3D texture-based and morphology-based features; (2) a multi-class offline feature selection method; and, (3) a novel image search engine framework for detecting DPLD. Very promising results have been obtained on a small test set.

Tao, Yimo; Zhou, Xiang Sean; Bi, Jinbo; Jerebkoa, Anna; Wolf, Matthias; Salganicoff, Marcos; Krishnana, Arun

2009-02-01

332

Characterizing Interdisciplinarity of Researchers and Research Topics Using Web Search Engines  

PubMed Central

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.

Sayama, Hiroki; Akaishi, Jin

2012-01-01

333

Discovery of gigantic molecular nanostructures using a flow reaction array as a search engine  

PubMed Central

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.

Zang, Hong-Ying; de la Oliva, Andreu Ruiz; Miras, Haralampos N.; Long, De-Liang; McBurney, Roy T.; Cronin, Leroy

2014-01-01

334

Power sources for search and rescue 406 MHz beacons  

NASA Technical Reports Server (NTRS)

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.

Attia, Alan I.; Perrone, David E.

1987-01-01

335

Iterative Radial Basis Functions Neural Networks as Metamodels of Stochastic Simulations of the Quality of Search Engines in the World Wide Web.  

ERIC Educational Resources Information Center

Discusses the evaluation of search engines and uses neural networks in stochastic simulation of the number of rejected Web pages per search query. Topics include the iterative radial basis functions (RBF) neural network; precision; response time; coverage; Boolean logic; regression models; crawling algorithms; and implications for search engine

Meghabghab, George

2001-01-01

336

An exactly solvable model of a stochastic heat engine: optimization of power, power fluctuations and efficiency  

NASA Astrophysics Data System (ADS)

We investigate a stochastic heat engine based on an over-damped particle diffusing on the positive real axis in an externally driven time-periodic log-harmonic potential. The periodic driving is composed of two isothermal and two adiabatic branches. Within our specific setting we verify the recent universal results regarding efficiency at maximum power and discuss properties of the optimal protocol. Namely, we show that for certain fixed parameters the optimal protocol maximizes not only the output power but also the efficiency. Moreover, we calculate the variance of the output work and discuss the possibility of minimizing fluctuations of the output power.

Holubec, Viktor

2014-05-01

337

Searching for stationarity: Purchasing power parity under the current float  

Microsoft Academic Search

Using panel data methods, we investigate long-run purchasing power parity by testing for unit roots in real exchange rates of industrial countries under the current float. The evidence against the unit root hypothesis is stronger for larger than for smaller panels, for monthly than for quarterly data, and when the German mark, rather than the United States dollar, is used

David H. Papell

1997-01-01

338

A graphical electromagnetic simulation laboratory for power systems engineering programs  

SciTech Connect

The recent availability of Electromagnetic Transient Programs with graphical front ends now makes it possible to put together models for circuits and systems in a manner similar to the connection of components in a laboratory. In the past, the non-graphical EMT Programs required considerable expertise in their use and thus distracted the students into the details or simulation. The introduction of a graphical simulation based laboratory into Undergraduate and Graduate Engineering Programs is presented, based on the PSCAD/EMTDC program. The philosophy behind the design of suitable example cases is presented within the framework of an Undergraduate Power Electronics Course, an HVdc Transmission Course and a course on Power System Protection.

Gole, A.M. [Univ. of Manitoba, Winnipeg, Manitoba (Canada)] [Univ. of Manitoba, Winnipeg, Manitoba (Canada); Nayak, O.B. [Manitoba HVDC Research Centre, Winnipeg, Manitoba (Canada)] [Manitoba HVDC Research Centre, Winnipeg, Manitoba (Canada); Sidhu, T.S.; Sachdev, M.S. [Univ. of Saskatchewan, Saskatoon, Saskatchewan (Canada)] [Univ. of Saskatchewan, Saskatoon, Saskatchewan (Canada)

1996-05-01

339

Nitinol Heat Engine power plant system installation and cost optimization  

SciTech Connect

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.

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

1984-08-01

340

Improved Harmony Search Algorithm for Optimal Placement and Sizing of Static Var Compensators in Power Systems  

Microsoft Academic Search

Static Var compensator (SVC) is normally used in power system to improve voltage profile and reduce system power losses. In this paper, a relatively new optimization technique named as the improved harmony search algorithm (IHS) is applied to determine optimal location and size of SVC devices in a transmission network. A multi-criterion objective function comprising of both operational objectives and

Reza Sirjani; Azah Mohamed

2011-01-01

341

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

Microsoft Academic Search

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

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

2010-01-01

342

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

Microsoft Academic Search

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

Zhenggang Xu; Xiaopeng Xie

2009-01-01

343

14 CFR 91.1037 - Large transport category airplanes: Turbine engine powered; Limitations; Destination and...  

Code of Federal Regulations, 2010 CFR

...person may permit a turbine engine powered...destination airport and the wind conditions expected...considering the probable wind velocity and direction...other person flying a turbine engine powered large...considering the probable wind velocity and direction...alternate airport for a turbine engine...

2009-01-01

344

10 CFR Appendix S to Part 50 - Earthquake Engineering Criteria for Nuclear Power Plants  

Code of Federal Regulations, 2010 CFR

...2011-01-01 2011-01-01 false Earthquake Engineering Criteria for Nuclear Power...App. S Appendix S to Part 50âEarthquake Engineering Criteria for Nuclear Power...issued before January 10, 1997, the earthquake engineering criteria in Section...

2011-01-01

345

10 CFR Appendix S to Part 50 - Earthquake Engineering Criteria for Nuclear Power Plants  

Code of Federal Regulations, 2010 CFR

...2012-01-01 2012-01-01 false Earthquake Engineering Criteria for Nuclear Power...App. S Appendix S to Part 50âEarthquake Engineering Criteria for Nuclear Power...issued before January 10, 1997, the earthquake engineering criteria in Section...

2012-01-01

346

14 CFR 91.1037 - Large transport category airplanes: Turbine engine powered; Limitations; Destination and...  

Code of Federal Regulations, 2010 CFR

...person may permit a turbine engine powered...destination airport and the wind conditions expected...considering the probable wind velocity and direction...other person flying a turbine engine powered large...considering the probable wind velocity and direction...alternate airport for a turbine engine...

2010-01-01

347

Identification of volatile and semivolatile compounds in chemical ionization GC-MS using a mass-to-structure (MTS) Search Engine with integral isotope pattern ranking.  

PubMed

The mass-to-structure or MTS Search Engine is an Access 2010 database containing theoretical molecular mass information for 19,438 compounds assembled from common sources such as the Merck Index, pesticide and pharmaceutical compilations, and chemical catalogues. This database, which contains no experimental mass spectral data, was developed as an aid to identification of compounds in atmospheric pressure ionization (API)-LC-MS. This paper describes a powerful upgrade to this database, a fully integrated utility for filtering or ranking candidates based on isotope ratios and patterns. The new MTS Search Engine is applied here to the identification of volatile and semivolatile compounds including pesticides, nitrosoamines and other pollutants. Methane and isobutane chemical ionization (CI) GC-MS spectra were obtained from unit mass resolution mass spectrometers to determine MH(+) masses and isotope ratios. Isotopes were measured accurately with errors of <4% and <6%, respectively, for A + 1 and A + 2 peaks. Deconvolution of interfering isotope clusters (e.g., M(+) and [M - H](+)) was required for accurate determination of the A + 1 isotope in halogenated compounds. Integrating the isotope data greatly improved the speed and accuracy of the database identifications. The database accurately identified unknowns from isobutane CI spectra in 100% of cases where as many as 40 candidates satisfied the mass tolerance. The paper describes the development and basic operation of the new MTS Search Engine and details performance testing with over 50 model compounds. PMID:23248816

Liao, Wenta; Draper, William M

2013-02-21

348

Novel electromagnetic structures for high-power dispersion engineering  

NASA Astrophysics Data System (ADS)

High power sources of coherent electromagnetic radiation have been an active area of research for decades, and have driven advances in directed energy, radar, and communications applications. At the highest levels of peak power, however, much of this research has been focused on oscillators driven by intense electron beams. One reason for this is the large amount of free energy associated with the space-charge of these intense beams provides ample means to drive an amplifier into self-oscillation. Recent advances in metamaterials, transformation optics, and photonic band gap structures have the potential to dramatically increase our capability to engineering the electromagnetic properties of the circuit, provide greater control of the beam-wave interaction, and offer new avenues to reach high power amplification. A notable challenge with this concept, however, is the capability of these structures to handle an intense RF and DC environment while retaining their physical integrity and electromagnetic properties. These challenges include electrical breakdown of the structures, AC and DC beam-loading, and melting due to losses in the configurations. Fundamental study of the physics of high-power sources based on metamaterials is needed to realize the potential of these advanced electromagnetic geometries.

Luginsland, John

2010-11-01

349

Savvy Searching.  

ERIC Educational Resources Information Center

Explains desktop metasearch engines, which search the databases of several search engines simultaneously. Reviews two particular versions, the Copernic 2001 Pro and the BullsEye Pro 3, comparing costs, subject categories, display capabilities, and layout for presenting results. (LRW)

Jacso, Peter

2002-01-01

350

Efficient harmony search algorithm for multi-stages scheduling problem for power systems degradation  

Microsoft Academic Search

Usually power energy demand increases randomly with time. To enhance system performance, expansion-planning to adapt the power\\u000a system capacity to the demand is predicted. This paper uses a harmony search meta-heuristic optimization method to solve the\\u000a multi-stage expansion problem for multi-state series-parallel power systems. The study horizon is divided into several periods.\\u000a At each period the demand distribution is forecasted

A. Zeblah; S. Hadjeri; E. Chatelet; Y. Massim

2010-01-01

351

Feeling lucky? Using search engines to assess perceptions of urban sustainability  

SciTech Connect

The sustainability of urban environments is an important issue at both local and international scales. Indicators are frequently used by decision-makers seeking to improve urban performance but these metrics can be dependent on sparse quantitative data. This paper explores the potential of an alternative approach, using an internet search engine to quickly gather qualitative data on the key attributes of cities. The method is applied to 21 world cities and the results indicate that, while the technique does shed light on direct and indirect aspects of sustainability, the validity of derived metrics as objective indicators of long-term sustainability is questionable. However the method's ability to provide subjective short-term assessments is more promising and it could therefore play an important role in participatory policy exercises such as public consultations. A number of promising technical improvements to the method's performance are also highlighted.

Keirstead, James [Energy Futures Lab, Level 7, Bessemer Building, Imperial College, South Kensington, London, SW7 2AZ (United Kingdom)], E-mail: j.keirstead@imperial.ac.uk

2009-02-15

352

Ramgen Power Systems-Supersonic Component Technology for Military Engine Applications.  

National Technical Information Service (NTIS)

Ramgen Power Systems, Inc. (RPS) is currently developing two high efficiency gas turbine engine concepts to create two entirely new gas turbine engines. The superior efficiency results from: (1) high pressure shock wave compression and supersonic expansio...

C. W. Sohn F. H. Holcomb P. Baldwin R. C. Steele S. Lawlor

2006-01-01

353

Performance of Army Arctic Engine Oils in Hydraulic and Power Transmission Fluid Systems.  

National Technical Information Service (NTIS)

Development of the Army's new Arctic Engine Oil (OEA) Specification MIL-L-46167 required numerous laboratory and field engine evaluations as well as large scale laboratory and field testing of these new lubricants in military hydraulic and power transmiss...

S. J. Lestz P. D. Hopler T. C. Bowen

1975-01-01

354

Population Variance Harmony Search Algorithm to Solve Optimal Power Flow with Non-Smooth Cost Function  

Microsoft Academic Search

This chapter presents a novel Harmony Search (HS) algorithm used to solve security constrained optimal power flow (OPF) with\\u000a various generator fuel cost characteristics. HS is a recently developed derivative-free, meta-heuristic optimization algorithm,\\u000a which draws inspiration from the musical process of searching for a perfect state of harmony. This chapter analyses the evolution\\u000a of the population-variance over successive generations in

Bijaya K. Panigrahi; V. Ravikumar Pandi; Swagatam Das; Ajith Abraham

2010-01-01

355

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

Microsoft Academic Search

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

Anita Tino; Gul N. Khan

2010-01-01

356

Low-power parallel tree architecture for full search block-matching motion estimation  

Microsoft Academic Search

In this paper, a novel low-power parallel tree architecture is pro- posed for full search block-matching motion estimation. The par- allel tree architecture exploits the spatial data correlations between parallel candidate block searches for data sharing, which effec- tively eliminates huge amount of data access bandwidth while con- sumes fewer hardware resources compared with array-based archi- tectures. Combining with adaptive

Siou-shen Lin; Po-chih Tseng; Liang-gee Chen

2004-01-01

357

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

NASA Technical Reports Server (NTRS)

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.

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

1978-01-01

358

Exergetic and thermoeconomic analyses of diesel engine powered cogeneration: Part 1 – Formulations  

Microsoft Academic Search

This paper is part 1 of the study on the energy, exergy, and exergoeconomic analysis of diesel engine powered cogeneration (DEPC). Part 1 presents the formulation developed for such a comprehensive analysis while part 2 is an application of the developed formulation that considers an actual cogeneration power plant. Compression ignition engine powered cogeneration application is among the most efficient

Aysegul Abusoglu; Mehmet Kanoglu

2009-01-01

359

14 CFR 125.377 - Fuel supply: Turbine-engine-powered airplanes other than turbopropeller.  

Code of Federal Regulations, 2010 CFR

...flight or takeoff a turbine-powered airplane...considering the wind and other weather conditions...flight or take off a turbine-engine powered...unless, considering wind and other weather conditions...person may release a turbine-engine-powered...fuel, considering wind and other...

2010-01-01

360

14 CFR 125.377 - Fuel supply: Turbine-engine-powered airplanes other than turbopropeller.  

Code of Federal Regulations, 2010 CFR

...flight or takeoff a turbine-powered airplane...considering the wind and other weather conditions...flight or take off a turbine-engine powered...unless, considering wind and other weather conditions...person may release a turbine-engine-powered...fuel, considering wind and other...

2009-01-01

361

A Virtual Engineering Framework for Simulating Advanced Power System  

SciTech Connect

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.

Mike Bockelie; Dave Swensen; Martin Denison; Stanislav Borodai

2008-06-18

362

Objective and automated protocols for the evaluation of biomedical search engines using No Title Evaluation protocols  

PubMed Central

Background The evaluation of information retrieval techniques has traditionally relied on human judges to determine which documents are relevant to a query and which are not. This protocol is used in the Text Retrieval Evaluation Conference (TREC), organized annually for the past 15 years, to support the unbiased evaluation of novel information retrieval approaches. The TREC Genomics Track has recently been introduced to measure the performance of information retrieval for biomedical applications. Results We describe two protocols for evaluating biomedical information retrieval techniques without human relevance judgments. We call these protocols No Title Evaluation (NT Evaluation). The first protocol measures performance for focused searches, where only one relevant document exists for each query. The second protocol measures performance for queries expected to have potentially many relevant documents per query (high-recall searches). Both protocols take advantage of the clear separation of titles and abstracts found in Medline. We compare the performance obtained with these evaluation protocols to results obtained by reusing the relevance judgments produced in the 2004 and 2005 TREC Genomics Track and observe significant correlations between performance rankings generated by our approach and TREC. Spearman's correlation coefficients in the range of 0.79–0.92 are observed comparing bpref measured with NT Evaluation or with TREC evaluations. For comparison, coefficients in the range 0.86–0.94 can be observed when evaluating the same set of methods with data from two independent TREC Genomics Track evaluations. We discuss the advantages of NT Evaluation over the TRels and the data fusion evaluation protocols introduced recently. Conclusion Our results suggest that the NT Evaluation protocols described here could be used to optimize some search engine parameters before human evaluation. Further research is needed to determine if NT Evaluation or variants of these protocols can fully substitute for human evaluations.

Campagne, Fabien

2008-01-01

363

Performance of the NEXT Engineering Model Power Processing Unit  

NASA Technical Reports Server (NTRS)

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.

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

2007-01-01

364

14 CFR 135.383 - Large transport category airplanes: Turbine engine powered: En route limitations: Two engines...  

Code of Federal Regulations, 2012 CFR

...2012-01-01 false Large transport category airplanes: Turbine...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.383 Large transport category airplanes: Turbine...turbine engine powered large transport category airplane along...

2012-01-01

365

14 CFR 135.383 - Large transport category airplanes: Turbine engine powered: En route limitations: Two engines...  

...2014-01-01 false Large transport category airplanes: Turbine...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.383 Large transport category airplanes: Turbine...turbine engine powered large transport category airplane along...

2014-01-01

366

14 CFR 135.381 - Large transport category airplanes: Turbine engine powered: En route limitations: One engine...  

Code of Federal Regulations, 2011 CFR

...2011-01-01 false Large transport category airplanes: Turbine...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.381 Large transport category airplanes: Turbine...turbine engine powered large transport category airplane...

2011-01-01

367

14 CFR 135.381 - Large transport category airplanes: Turbine engine powered: En route limitations: One engine...  

...2014-01-01 false Large transport category airplanes: Turbine...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.381 Large transport category airplanes: Turbine...turbine engine powered large transport category airplane...

2014-01-01

368

14 CFR 135.381 - Large transport category airplanes: Turbine engine powered: En route limitations: One engine...  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false Large transport category airplanes: Turbine...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.381 Large transport category airplanes: Turbine...turbine engine powered large transport category airplane...

2013-01-01

369

14 CFR 135.381 - Large transport category airplanes: Turbine engine powered: En route limitations: One engine...  

Code of Federal Regulations, 2012 CFR

...2012-01-01 false Large transport category airplanes: Turbine...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.381 Large transport category airplanes: Turbine...turbine engine powered large transport category airplane...

2012-01-01

370

14 CFR 135.383 - Large transport category airplanes: Turbine engine powered: En route limitations: Two engines...  

Code of Federal Regulations, 2010 CFR

...2010-01-01 false Large transport category airplanes: Turbine...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.383 Large transport category airplanes: Turbine...turbine engine powered large transport category airplane along...

2010-01-01

371

14 CFR 135.383 - Large transport category airplanes: Turbine engine powered: En route limitations: Two engines...  

Code of Federal Regulations, 2011 CFR

...2011-01-01 false Large transport category airplanes: Turbine...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.383 Large transport category airplanes: Turbine...turbine engine powered large transport category airplane along...

2011-01-01

372

14 CFR 135.383 - Large transport category airplanes: Turbine engine powered: En route limitations: Two engines...  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false Large transport category airplanes: Turbine...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.383 Large transport category airplanes: Turbine...turbine engine powered large transport category airplane along...

2013-01-01

373

Engineering Development of Coal-Fired High Performance Power Systems  

SciTech Connect

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

None

2000-12-31

374

Thermal energy storage for the Stirling engine powered automobile  

NASA Technical Reports Server (NTRS)

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.

Morgan, D. T. (editor)

1979-01-01

375

Power Hardware-in-the-loop Simulation of a Gas Engine Cogeneration System for Developing a Power Converter System  

Microsoft Academic Search

This research focuses on the development scheme of a power converter in a gas engine cogeneration system using a power hardware-in-the-loop simulation. A matrix converter is adopted to substitute a conventional ac\\/dc\\/ac converter and transfers three phase electricity to single phase electricity directly. To inevstigate the interaction between gas engine-generator unit and the proposed matrix converter, a power hardware-in-the-loop simulation

Miao Hong; Satoshi Horie; Yushi Miura; Tosifumi Ise; Yuki Sato; Toshinari Momose; Christian Dufour

2010-01-01

376

Project-Based Learning: A Search and Rescue UAV - Perceptions of an Undergraduate Engineering Design Team: A Preliminary Study  

Microsoft Academic Search

The aim of this paper is to provide a voice for students about project-based learning in an undergraduate education setting. During their final year of a four year undergraduate engineering degree a group of 8 students successfully designed, developed and manufactured an autonomous search and rescue Unmanned Aerial Vehicle (UAV), as an integrated project-based learning part of the curriculum. The

Benjamin J. Chartier; Brad A. Gibson

377

The Impact of Search Engine Selection and Sorting Criteria on Vaccination Beliefs and Attitudes: Two Experiments Manipulating Google Output  

PubMed Central

Background During the past 2 decades, the Internet has evolved to become a necessity in our daily lives. The selection and sorting algorithms of search engines exert tremendous influence over the global spread of information and other communication processes. Objective This study is concerned with demonstrating the influence of selection and sorting/ranking criteria operating in search engines on users’ knowledge, beliefs, and attitudes of websites about vaccination. In particular, it is to compare the effects of search engines that deliver websites emphasizing on the pro side of vaccination with those focusing on the con side and with normal Google as a control group. Method We conducted 2 online experiments using manipulated search engines. A pilot study was to verify the existence of dangerous health literacy in connection with searching and using health information on the Internet by exploring the effect of 2 manipulated search engines that yielded either pro or con vaccination sites only, with a group receiving normal Google as control. A pre-post test design was used; participants were American marketing students enrolled in a study-abroad program in Lugano, Switzerland. The second experiment manipulated the search engine by applying different ratios of con versus pro vaccination webpages displayed in the search results. Participants were recruited from Amazon’s Mechanical Turk platform where it was published as a human intelligence task (HIT). Results Both experiments showed knowledge highest in the group offered only pro vaccination sites (Z=–2.088, P=.03; Kruskal-Wallis H test [H5]=11.30, P=.04). They acknowledged the importance/benefits (Z=–2.326, P=.02; H5=11.34, P=.04) and effectiveness (Z=–2.230, P=.03) of vaccination more, whereas groups offered antivaccination sites only showed increased concern about effects (Z=–2.582, P=.01; H5=16.88, P=.005) and harmful health outcomes (Z=–2.200, P=.02) of vaccination. Normal Google users perceived information quality to be positive despite a small effect on knowledge and a negative effect on their beliefs and attitudes toward vaccination and willingness to recommend the information (?2 5=14.1, P=.01). More exposure to antivaccination websites lowered participants’ knowledge (J=4783.5, z=?2.142, P=.03) increased their fear of side effects (J=6496, z=2.724, P=.006), and lowered their acknowledgment of benefits (J=4805, z=–2.067, P=.03). Conclusion The selection and sorting/ranking criteria of search engines play a vital role in online health information seeking. Search engines delivering websites containing credible and evidence-based medical information impact positively Internet users seeking health information. Whereas sites retrieved by biased search engines create some opinion change in users. These effects are apparently independent of users’ site credibility and evaluation judgments. Users are affected beneficially or detrimentally but are unaware, suggesting they are not consciously perceptive of indicators that steer them toward the credible sources or away from the dangerous ones. In this sense, the online health information seeker is flying blind.

Schulz, Peter Johannes; Nakamoto, Kent

2014-01-01

378

Semantic similarity measures in the biomedical domain by leveraging a web search engine.  

PubMed

Various researches in web related semantic similarity measures have been deployed. However, measuring semantic similarity between two terms remains a challenging task. The traditional ontology-based methodologies have a limitation that both concepts must be resided in the same ontology tree(s). Unfortunately, in practice, the assumption is not always applicable. On the other hand, if the corpus is sufficiently adequate, the corpus-based methodologies can overcome the limitation. Now, the web is a continuous and enormous growth corpus. Therefore, a method of estimating semantic similarity is proposed via exploiting the page counts of two biomedical concepts returned by Google AJAX web search engine. The features are extracted as the co-occurrence patterns of two given terms P and Q, by querying P, Q, as well as P AND Q, and the web search hit counts of the defined lexico-syntactic patterns. These similarity scores of different patterns are evaluated, by adapting support vector machines for classification, to leverage the robustness of semantic similarity measures. Experimental results validating against two datasets: dataset 1 provided by A. Hliaoutakis; dataset 2 provided by T. Pedersen, are presented and discussed. In dataset 1, the proposed approach achieves the best correlation coefficient (0.802) under SNOMED-CT. In dataset 2, the proposed method obtains the best correlation coefficient (SNOMED-CT: 0.705; MeSH: 0.723) with physician scores comparing with measures of other methods. However, the correlation coefficients (SNOMED-CT: 0.496; MeSH: 0.539) with coder scores received opposite outcomes. In conclusion, the semantic similarity findings of the proposed method are close to those of physicians' ratings. Furthermore, the study provides a cornerstone investigation for extracting fully relevant information from digitizing, free-text medical records in the National Taiwan University Hospital database. PMID:25055314

Sheau-Ling Hsieh; Wen-Yung Chang; Chi-Huang Chen; Yung-Ching Weng

2013-07-01

379

A reactive tabu search for service restoration in electric power distribution systems  

Microsoft Academic Search

This paper presents a reactive tabu search for service restoration in electric power distribution systems. Service restoration is an emergency control in distribution control centers to restore out-of-service area as soon as possible when a fault occurs in distribution systems. Therefore, it requires fast computation time and high quality solutions for customers' satisfaction. The problem can be formulated as a

Sakae Toune; Hiroyuki Fudo; Takamu Genji; Yoshikazu Fukuyama; Yosuke Nakanishi

1998-01-01

380

Analyzing the Web Crawler as a Feed Forward Engine for an Efficient Solution to the Search Problem in the Minimum Amount of Time through a Distributed Framework  

Microsoft Academic Search

A web crawler forms the backbone of a search engine and this backbone needs a careful re- assessment that could enhance the efficiency of search engines. This paper conducts such a re- assessment from the perspective of systems and this is achieved through implementation and analysis of a web crawler \\

M. Atif Qureshi; Arjumand Younus; Francisco Rojas

2010-01-01

381

Component Improvement of Free-Piston Stirling Engine Key Technology for Space Power.  

National Technical Information Service (NTIS)

The successful performance of the 25 kW Space Power Demonstrator (SPD) engine during an extensive testing period has provided a baseline of free piston Stirling engine technology from which future space Stirling engines may evolve. Much of the success of ...

D. L. Alger

1988-01-01

382

The Power and the Pleasure? A Research Agenda for "Making Gender Stick" to Engineers.  

ERIC Educational Resources Information Center

Seeks to open up a new avenue for feminist technology studies--gender-aware research on engineers and engineering practice--on the grounds that engineers are power symbols of the equation between masculinity and technology, and occupy significant roles in shaping new technologies. (Author/CCM)

Faulkner, Wendy

2000-01-01

383

Magnetohydrodynamics (MHD) Engineering Test Facility (ETF) 200 MWe power plant. Conceptual Design Engineering Report (CDER). Volume 2: Engineering. Volume 3: Costs and schedules  

NASA Technical Reports Server (NTRS)

Engineering design details for the principal systems, system operating modes, site facilities, and structures of an engineering test facility (ETF) of a 200 MWE power plant are presented. The ETF resembles a coal-fired steam power plant in many ways. It is analogous to a conventional plant which has had the coal combustor replaced with the MHD power train. Most of the ETF components are conventional. They can, however, be sized or configured differently or perform additional functions from those in a conventional coal power plant. The boiler not only generates steam, but also performs the functions of heating the MHD oxidant, recovering seed, and controlling emissions.

1981-01-01

384

Magnetohydrodynamics (MHD) Engineering Test Facility (ETF) 200 MWe power plant. Conceptual Design Engineering Report (CDER). Volume 2: Engineering. Volume 3: Costs and schedules. Final Report  

SciTech Connect

Engineering design details for the principal systems, system operating modes, site facilities, and structures of an engineering test facility (ETF) of a 200 MWE power plant are presented. The ETF resembles a coal-fired steam power plant in many ways. It is analogous to a conventional plant which has had the coal combustor replaced with the MHD power train. Most of the ETF components are conventional. They can, however, be sized or configured differently or perform additional functions from those in a conventional coal power plant. The boiler not only generates steam, but also performs the functions of heating the MHD oxidant, recovering seed, and controlling emissions.

Not Available

1981-09-01

385

High-Power Baseline and Motoring Test Results for the GPU-3 Stirling Engine.  

National Technical Information Service (NTIS)

Test results are given for the full power range of the engine with both helium and hydrogen working fluids. Comparisons are made to previous testing using an alternator and resistance load bank to absorb the engine output. Indicated power results are pres...

L. G. Thieme

1981-01-01

386

A knowledge-based search engine to navigate the information thicket of nanotoxicology.  

PubMed

The risk assessment of nano-sized materials (NM) currently suffers from great uncertainties regarding their putative toxicity for humans and the environment. An extensive amount of the respective original research literature has to be evaluated before a targeted and hypothesis-driven Environmental and Health Safety research can be stipulated. Furthermore, to comply with the European animal protection legislation in vitro testing has to be preferred whenever possible. Against this background, there is the need for tools that enable producers of NM and risk assessors for a fast and comprehensive data retrieval, thereby linking the 3Rs principle to the hazard identification of NM. Here we report on the development of a knowledge-based search engine that is tailored to the particular needs of risk assessors in the area of NM. Comprehensive retrieval of data from studies utilising in vitro as well as in vivo methods relying on the PubMed database is presented exemplarily with a titanium dioxide case study. A fast, relevant and reliable information retrieval is of paramount importance for the scientific community dedicated to develop safe NM in various product areas, and for risk assessors obliged to identify data gaps, to define additional data requirements for approval of NM and to create strategies for integrated testing using alternative methods. PMID:20850491

Sauer, Ursula G; Kneuer, Carsten; Tentschert, Jutta; Wächter, Thomas; Schroeder, Michael; Butzke, Daniel; Luch, Andreas; Liebsch, Manfred; Grune, Barbara; Götz, Mario E

2011-02-01

387

Concept-based method and system for dynamically analyzing results from search engines  

US Patent & Trademark Office Database

A method, system and computer program for identifying a relationship between concepts in an object includes (i) selecting the object for inclusion in an initial subset of objects obtained as an output of a search engine; (ii) storing the object in a database; (iii) creating an index of the object; (iv) analyzing the index to extract two concepts relating to the object; (v) highlighting the two concepts within object; (vi) calculating a strength of a relationship between the two concepts using a ratio; (vii) storing the two concepts and the strength of the relationships between the two concepts in a database; (viii) presenting the two concepts and the strength in an interface that has a concept matrix; and (ix) repeating steps vi through viii for every possible pairwise combination of concepts within the index. The relationship can be the two concepts both occur in the same object; the two concepts occur near each other within the same object; and the two concepts occur near each other and in a particular order within the same object. The ratio can be a support ratio; an occurrence ratio; and a combined ratio. An additional concept can be added to the index; all the concepts can be grouped in the index by concept type; and complex meta-structures can be created. The concept type can be a part of speech; a geographic region; a person; a group of persons; a business unit; an organization; an action; a process; a product; a service; a subject; and a category.

2013-11-19

388

Internal and External Beliefs as the Determinants of Use Continuance for an Internet Search Engine  

NASA Astrophysics Data System (ADS)

The antecedents of IS use continuance is gaining research focus recently. The traditional beliefs based on TRA have been adopted as the main drivers of IS use continuance. They are based on the assumptions that continuance is a simple repetition of initial adoption because those belief constructs are the same with those for TAM. However, continued usage is a matter of continuous decision making in the competitive alternative systems. Furthermore, control factors such as habit, self efficacy, and self identity have been suggested to extend TRA. This study introduced self-identity, self-efficacy and perceived switching cost as a new driver for IS use continuance. 395 samples were collected from the users of a Korean internet search engine portal site. Data analysis using Structural Equation Modeling (SEM) shows that while the effect of habit overwhelms the effect of intention on continuance, it is also mediated by self identity and self efficacy. These can be considered as the internal beliefs formed by the internalization of habit. On the contrary, external beliefs such as switching cost and perceived usefulness showed no significant effect on continuance.

Hong, Soongeun; Kang, Young Sik; Lee, Heeseok; Lee, Jongwon

389

Multi-lingual search engine to access PubMed monolingual subsets: a feasibility study.  

PubMed

PubMed contains many articles in languages other than English but it is difficult to find them using the English version of the Medical Subject Headings (MeSH) Thesaurus. The aim of this work is to propose a tool allowing access to a PubMed subset in one language, and to evaluate its performance. Translations of MeSH were enriched and gathered in the information system. PubMed subsets in main European languages were also added in our database, using a dedicated parser. The CISMeF generic semantic search engine was evaluated on the response time for simple queries. MeSH descriptors are currently available in 11 languages in the information system. All the 654,000 PubMed citations in French were integrated into CISMeF database. None of the response times exceed the threshold defined for usability (2 seconds). It is now possible to freely access biomedical literature in French using a tool in French; health professionals and lay people with a low English language may find it useful. It will be expended to several European languages: German, Spanish, Norwegian and Portuguese. PMID:23920740

Darmoni, Stéfan J; Soualmia, Lina F; Griffon, Nicolas; Grosjean, Julien; Kerdelhué, Gaétan; Kergourlay, Ivan; Dahamna, Badisse

2013-01-01

390

Unbounded Binary Search for a Fast and Accurate Maximum Power Point Tracking  

NASA Astrophysics Data System (ADS)

This paper presents a technique for maximum power point tracking (MPPT) of a concentrating photovoltaic system using cell level power optimization. Perturb and observe (P&O) has been a standard for an MPPT, but it introduces a tradeoff between the tacking speed and the accuracy of the maximum power delivered. The P&O algorithm is not suitable for a rapid environmental condition change by partial shading and self-shading due to its tracking time being linear to the length of the voltage range. Some of researches have been worked on fast tracking but they come with internal ad hoc parameters. In this paper, by using the proposed unbounded binary search algorithm for the MPPT, tracking time becomes a logarithmic function of the voltage search range without ad hoc parameters.

Kim, Yong Sin; Winston, Roland

2011-12-01

391

Analysis of Apex Seal Friction Power Loss in Rotary Engines  

NASA Technical Reports Server (NTRS)

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.

Handschuh, Robert F.; Owen, A. Karl

2010-01-01

392

Power Hardware-in-the-loop Simulation of a Gas Engine Cogeneration System for Developing a Power Converter System  

NASA Astrophysics Data System (ADS)

This research focuses on the development scheme of a power converter in a gas engine cogeneration system using a power hardware-in-the-loop simulation. A matrix converter is adopted to substitute a conventional ac/dc/ac converter and transfers three phase electricity to single phase electricity directly. To inevstigate the interaction between gas engine-generator unit and the proposed matrix converter, a power hardware-in-the-loop simulation is carried out, in which a piece of real matrix converter is installed in the simulation loop and interfaces with the numerical model of gas engine-generator unit. Numerical models of gas engine and generator are presented and verified by experiment. The configuration of the power hardware-in-the-loop simulation is described and results are also presented, through which the practical application of matrix converter is well demonstrated.

Hong, Miao; Horie, Satoshi; Miura, Yushi; Ise, Tosifumi; Sato, Yuki; Momose, Toshinari; Dufour, Christian

393

Transient and steady-state performance of Space Power Research Engine with resistive\\/motor loads  

Microsoft Academic Search

This paper describes the results of tests carried out on the Space Power Research Engine (SPRE) developed as an advanced power convertor for space-based electrical power generation. The tests were performed at NASA Lewis Research Center LeRC, to evaluate the interaction and performance of a free-piston Stirling engine\\/linear alternator (FPSE\\/LA) feeding into either a resistive or small induction motor load.

D. Kankam; Jeffrey S. Rauch

1996-01-01

394

A Self-Adaptive Harmony Search Algorithm for Engineering and Reliability Problems  

Microsoft Academic Search

In this article, we suggest a new method to improve the harmony search meta-heuristic algorithm. Several approaches are presented for improving the harmony search algorithm. These approaches consider different values for initial parameters in each optimization problem. Differences between the proposed algorithm and the harmony search algorithm are as follows. First, we add a new step to create a new

Hadi Sarvari; K. Zamanifar

2010-01-01

395

Comparison of advanced engines for parabolic dish solar thermal power plants  

NASA Technical Reports Server (NTRS)

A paraboloidal dish solar thermal power plant produces electrical energy by a two-step conversion process. The collector subsystem is composed of a two-axis tracking paraboloidal concentrator and a cavity receiver. The concentrator focuses intercepted sunlight (direct, normal insolation) into a cavity receiver whose aperture encircles the focal point of the concentrator. At the internal wall of the receiver the electromagnetic radiation is converted to thermal energy. A heat engine/generator assembly then converts the thermal energy captured by the receiver to electricity. Developmental activity has been concentrated on small power modules which employ 11- to 12-meter diameter dishes to generate nominal power levels of approximately 20 kWe. A comparison of advanced heat engines for the dish power module is presented in terms of the performance potential of each engine with its requirements for advanced technology development. Three advanced engine possibilities are the Brayton (gas turbine), Brayton/Rankine combined cycle, and Stirling engines.

Fujita, T.; Bowyer, J. M.; Gajanana, B. C.

1980-01-01

396

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

NASA Technical Reports Server (NTRS)

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.

Santiago, Walter; Birchenough, Arthur G.

2006-01-01

397

ENGINEERING DEVELOPMENT OF COAL-FIRED HIGH PERFORMANCE POWER SYSTEMS  

SciTech Connect

A High Performance Power System (HIPPS) is being developed. This system is a coal-fired, combined cycle plant with indirect heating of gas turbine air. Foster Wheeler Development Corporation and a team consisting of Foster Wheeler Energy Corporation, Bechtel Corporation, University of Tennessee Space Institute and Westinghouse Electric Corporation are developing this system. In Phase 1 of the project, a conceptual design of a commercial plant was developed. Technical and economic analyses indicated that the plant would meet the goals of the project which include a 47 percent efficiency (HHV) and a 10 percent lower cost of electricity than an equivalent size PC plant. The concept uses a pyrolyzation process to convert coal into fuel gas and char. The char is fired in a High Temperature Advanced Furnace (HITAF). The HITAF is a pulverized fuel-fired boiler/air heater where steam is generated and gas turbine air is indirectly heated. The fuel gas generated in the pyrolyzer is then used to heat the gas turbine air further before it enters the gas turbine. The project is currently in Phase 2 which includes engineering analysis, laboratory testing and pilot plant testing. Research and development is being done on the HIPPS systems that are not commercial or being developed on other projects. Pilot plant testing of the pyrolyzer subsystem and the char combustion subsystem are being done separately, and after each experimental program has been completed, a larger scale pyrolyzer will be tested at the Power Systems Development Facility (PSDF) in Wilsonville, Al. The facility is equipped with a gas turbine and a topping combustor, and as such, will provide an opportunity to evaluate integrated pyrolyzer and turbine operation. This report addresses the areas of technical progress for this quarter. Preliminary process design was started with respect to the integrated test program at the PSDF. All of the construction tasks at Foster Wheeler's Combustion and Environmental Test Facility (CETF) have been completed in preparation for the char combustion test program, this includes installation of the char burner, and the on-line mass spectrometer. A test matrix has been defined, utilizing a statistical design of experiment (SDOE) methodology, for the char combustion program. The first phase of the CETF shakedown has been completed, and all analog devices (thermocouples, transmitters, etc.) have been calibrated.

NONE

1998-10-01

398

MetaLib, WebFeat, and Google: The strengths and weaknesses of federated search engines compared with Google  

Microsoft Academic Search

Purpose – Seeks to describe library federated search engines MetaLib and WebFeat as research tools by comparing MetaLib with WebFeat and by highlighting their strengths and weaknesses against Google and Google Scholar. Design\\/methodology\\/approach – This study tested MetaLib and WebFeat from various libraries; attended vendor demos and asked vendors questions; reviewed literature; and interviewed system administrators of MetaLib and WebFeat.

Xiaotian Chen

2006-01-01

399

Using Google Scholar to Search for Online Availability of a Cited Article in Engineering Disciplines  

ERIC Educational Resources Information Center

Many published studies examine the effectiveness of Google Scholar (Scholar) as an index for scholarly articles. This paper analyzes the value of Scholar in finding and labeling online full text of articles using titles from the citations of engineering faculty publications. For the fields of engineering and the engineering colleges in the study,…

Baldwin, Virginia A.

2009-01-01

400

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.

2000-01-01

401

BioTCM-SE: A Semantic Search Engine for the Information Retrieval of Modern Biology and Traditional Chinese Medicine  

PubMed Central

Understanding the functional mechanisms of the complex biological system as a whole is drawing more and more attention in global health care management. Traditional Chinese Medicine (TCM), essentially different from Western Medicine (WM), is gaining increasing attention due to its emphasis on individual wellness and natural herbal medicine, which satisfies the goal of integrative medicine. However, with the explosive growth of biomedical data on the Web, biomedical researchers are now confronted with the problem of large-scale data analysis and data query. Besides that, biomedical data also has a wide coverage which usually comes from multiple heterogeneous data sources and has different taxonomies, making it hard to integrate and query the big biomedical data. Embedded with domain knowledge from different disciplines all regarding human biological systems, the heterogeneous data repositories are implicitly connected by human expert knowledge. Traditional search engines cannot provide accurate and comprehensive search results for the semantically associated knowledge since they only support keywords-based searches. In this paper, we present BioTCM-SE, a semantic search engine for the information retrieval of modern biology and TCM, which provides biologists with a comprehensive and accurate associated knowledge query platform to greatly facilitate the implicit knowledge discovery between WM and TCM.

Chen, Xi; Chen, Huajun; Bi, Xuan; Gu, Peiqin; Chen, Jiaoyan; Wu, Zhaohui

2014-01-01

402

BioTCM-SE: A Semantic Search Engine for the Information Retrieval of Modern Biology and Traditional Chinese Medicine.  

PubMed

Understanding the functional mechanisms of the complex biological system as a whole is drawing more and more attention in global health care management. Traditional Chinese Medicine (TCM), essentially different from Western Medicine (WM), is gaining increasing attention due to its emphasis on individual wellness and natural herbal medicine, which satisfies the goal of integrative medicine. However, with the explosive growth of biomedical data on the Web, biomedical researchers are now confronted with the problem of large-scale data analysis and data query. Besides that, biomedical data also has a wide coverage which usually comes from multiple heterogeneous data sources and has different taxonomies, making it hard to integrate and query the big biomedical data. Embedded with domain knowledge from different disciplines all regarding human biological systems, the heterogeneous data repositories are implicitly connected by human expert knowledge. Traditional search engines cannot provide accurate and comprehensive search results for the semantically associated knowledge since they only support keywords-based searches. In this paper, we present BioTCM-SE, a semantic search engine for the information retrieval of modern biology and TCM, which provides biologists with a comprehensive and accurate associated knowledge query platform to greatly facilitate the implicit knowledge discovery between WM and TCM. PMID:24772189

Chen, Xi; Chen, Huajun; Bi, Xuan; Gu, Peiqin; Chen, Jiaoyan; Wu, Zhaohui

2014-01-01

403

Biomedical Search  

NSDL National Science Digital Library

Wading through the tremendous online resource that is the BioMed archive can be a bit tricky at times. This process just got much easier through the creation of the BioMedSearch feature. The goal of this work is "to make these important works available to the community in a way that is fast and easy, while still offering the advanced features demanded by power users such as portfolios, collaboration features, bibliographical citation export, alerts, and more." Their search engine contains all of the data in Pub Med/Medline, along with additional full-text documents, and a large database of theses and dissertations. Many users will find the "Clusters" section of the site most useful. Here, visitors can view "clusters" of documents grouped together thematically into topics such as clinical trials, exercises, diet and cholesterol, and medical imagining. The homepage contains a basic search engine, and visitors may also wish to use the "Search Tutorial" to gain a better understanding of how best to use the archive.

404

Method for Engineering Calculation and Selection of Parameters for the Power Systems of Battery-Powered Electric Automobiles.  

National Technical Information Service (NTIS)

A method is examined for engineering calculation and selection of parameters for the power systems of battery-powered electric automobiles (EA) with capacities of 0.5 to 1.2 tons depending on the requirements imposed by the production assignment for the s...

A. A. Momdzhyan E. M. Dilanyan

1979-01-01

405

Power Processing Unit for 20mN-Class Ion Engine System.  

National Technical Information Service (NTIS)

The 20mN-class ion engine system to be mounted on geosynchronous satellites is described. The system requires stabilized electric power of 700 W to ionize the propellant and accelerate the ions. The electric power is supplied by the Power Processing Unit ...

H. Osuga K. Masuo T. Gohnai T. Okamura I. Terukina

1989-01-01

406

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

ERIC Educational Resources Information Center

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…

Vanfretti, L.; Milano, F.

2012-01-01

407

Flywheel-heat engine power for an energy-economic personal vehicle  

Microsoft Academic Search

New materials and energy problems are increasing the feasibility of using flywheel energy storage systems to power personal automobiles. A promising concept appears to be the combination of the high specific power density of a flywheel with the high specific energy density of a small heat engine. A technical and fuel economy assessment of a small personal vehicle powered by

Loscutoff

1976-01-01

408

14 CFR 121.645 - Fuel supply: Turbine-engine powered airplanes, other than turbo propeller: Flag and supplemental...  

Code of Federal Regulations, 2010 CFR

...645 Fuel supply: Turbine-engine powered airplanes...for flight or takeoff a turbine-engine powered airplane...unless, considering wind and other weather conditions...person may release a turbine-engine powered airplane...enough fuel, considering wind and other weather...

2010-01-01

409

14 CFR 121.645 - Fuel supply: Turbine-engine powered airplanes, other than turbo propeller: Flag and supplemental...  

Code of Federal Regulations, 2010 CFR

...645 Fuel supply: Turbine-engine powered airplanes...for flight or takeoff a turbine-engine powered airplane...unless, considering wind and other weather conditions...person may release a turbine-engine powered airplane...enough fuel, considering wind and other weather...

2009-01-01

410

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

NASA Technical Reports Server (NTRS)

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.

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

1985-01-01

411

Tabu Search  

Microsoft Academic Search

This article explores the meta-heuristic approach called tabu search, which is dramatically changing our ability to solve a host of problems in applied science, business and engineering. Tabu search has important links to evolutionary and \\

Fred Glover; Manuel Laguna

2003-01-01

412

Engineering support for magnetohydrodynamic power plant analysis and design studies  

NASA Technical Reports Server (NTRS)

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.

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

1980-01-01

413

Transient Plasma Physics: Nanosecond Pulsed Power Applied to Energy, Engines, and Other Things  

NASA Astrophysics Data System (ADS)

Plasma in a formative state prior to equilibration of the electron energy distribution, (referred to here as ``transient plasma''), is studied for improvement of engine efficiency in various types of fuel-burning engines. Ignition by transient plasma has demonstrated substantially reduced ignition delay, and shows promise for improving engine efficiency through improved combustion efficiency. This transient plasma persists for only a short time, and requires for operation short (< 100ns) pulsed high voltage, and typically small pulse energy (10mJ to < 1J). It thus requires nanosecond-time scale pulsed power. The plasmas, combined with the subsequent combustion, provide a rich physics. Results for studies of several varied engine types including internal combustion engines and pulse detonation engines will be reviewed. Experiments and modeling to determine the physics and some ideas for future directions will be presented. In addition, some other diverse applications for nanosecond pulsed power will be briefly described.

Pendleton, Scott

2012-10-01

414

Engine Optimization for a Solar Thermal Powered Orbit Transfer Vehicle  

NASA Astrophysics Data System (ADS)

Recent technological advancements in solar thermal rocket propulsion and solar orbit transfer vehicles make it critical to perform additional engine performance analyses. Several system level flight demonstrations are imminent. Space flight hardware component testing is being conducted at the Air Force Research Laboratory, Edwards AFB, California. The focus of current research is engine and nozzle configurations for a solar orbit transfer vehicle. The optimal design must produce 1-10 pounds thrust, perform at high lsp and be compatible in a hybrid of spiral, perigee, and apogee (multi-burn) configurations. The nozzle material must not ablate when subjected to extreme thermal loading, yet be durable enough to withstand widely varying temperature differentials during frequent thermal cycling. This paper addresses propulsive needs in the orbit transfer arena and defines governing upper stage vehicle engine equations. These equations are modified versions of rocket engine equations used for chemical systems. The correction factors and modifications are for Solar Thermal Propulsion specific hardware.

1998-06-01

415

Jupiter's Tropospheric Thermal Emission. II. Power Spectrum Analysis and Wave Search  

NASA Astrophysics Data System (ADS)

We study power spectra and search for planetary waves in images of Jupiter's cloud opacity. The observation wavelength of 4.9 ?m senses thermal emission from the ˜5-bar level; overlying clouds attenuate the emission. Our companion paper (J. Harrington, T. E. Dowling, and R. L. Baron, 1996, Icarus124, 22-31) describes 19 nights of observations (6 with 360° longitude coverage) and new reduction techniques. Atmospheric seeing limits resolution to ˜2500 km. Zonal power spectral density at planetary wavenumbers higher than ˜25 follows a power law in the wavenumber. Eastward jet-power laws average -2.71 ± 0.07 and westward jet-power laws, excluding cloud-obscured regions, average -3.14 ± 0.12. Wavenumbers 1-24 roughly follow power laws near -0.7 for both jet directions, but with many superposed discrete features. The meridional spectrum similarly breaks around wavenumber 25, with power law trends of -0.36 and -3.27. However, a pattern of undulations is superposed over its linear trends. L. D. Travis (1978, J. Atmos. Sci.35, 1584-1595) established an empirical correspondence between power spectra of atmospheric kinetic energy and those of cloud opacities for the Earth and analyzed Venus cloud data under this assumption. We do the same for Jupiter. If the Rossby deformation radius, Ld, were an energy input scale, as baroclinic instability theory predicts, one would expect energy and enstrophy cascades (power laws of -5/3 and -3, respectively) on opposite sides of the wavenumber corresponding to Ld. If the top of our high-wavenumber power law is Ld, its value is ˜2100 km at 45° latitude. Our spectra show persistent features with phases moving linearly over the 99-day observation period. Some of these can be identified with periodic features such as vortex chains and the equatorial plumes. The origin of others is less certain. We present a table of our best wave candidates.

Harrington, Joseph; Dowling, Timothy E.; Baron, Richard L.

1996-11-01

416

14 CFR 135.365 - Large transport category airplanes: Reciprocating engine powered: Weight limitations.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false Large transport category airplanes: Reciprocating...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.365 Large transport category airplanes: Reciprocating...reciprocating engine powered large transport category airplane from...

2013-01-01

417

14 CFR 135.379 - Large transport category airplanes: Turbine engine powered: Takeoff limitations.  

Code of Federal Regulations, 2011 CFR

...2011-01-01 false Large transport category airplanes: Turbine...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.379 Large transport category airplanes: Turbine...turbine engine powered large transport category airplane may...

2011-01-01

418

14 CFR 135.387 - Large transport category airplanes: Turbine engine powered: Landing limitations: Alternate airports.  

Code of Federal Regulations, 2012 CFR

...2012-01-01 false Large transport category airplanes: Turbine...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.387 Large transport category airplanes: Turbine...turbine engine powered large transport category airplane...

2012-01-01

419

14 CFR 135.385 - Large transport category airplanes: Turbine engine powered: Landing limitations: Destination...  

...2014-01-01 false Large transport category airplanes...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS... § 135.385 Large transport category airplanes...engine powered large transport category airplane...direction, in still air. (2) The...

2014-01-01

420

14 CFR 135.375 - Large transport category airplanes: Reciprocating engine powered: Landing limitations...  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false Large transport category airplanes...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS... § 135.375 Large transport category airplanes...engine powered large transport category airplane...favorable direction in still air. (2) The...

2013-01-01

421

14 CFR 135.365 - Large transport category airplanes: Reciprocating engine powered: Weight limitations.  

...2014-01-01 false Large transport category airplanes: Reciprocating...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.365 Large transport category airplanes: Reciprocating...reciprocating engine powered large transport category airplane from...

2014-01-01

422

14 CFR 135.365 - Large transport category airplanes: Reciprocating engine powered: Weight limitations.  

Code of Federal Regulations, 2011 CFR

...2011-01-01 false Large transport category airplanes: Reciprocating...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.365 Large transport category airplanes: Reciprocating...reciprocating engine powered large transport category airplane from...

2011-01-01

423

14 CFR 135.375 - Large transport category airplanes: Reciprocating engine powered: Landing limitations...  

Code of Federal Regulations, 2012 CFR

...2012-01-01 false Large transport category airplanes...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS... § 135.375 Large transport category airplanes...engine powered large transport category airplane...favorable direction in still air. (2) The...

2012-01-01

424

14 CFR 91.1037 - Large transport category airplanes: Turbine engine powered; Limitations; Destination and...  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false Large transport category airplanes...TRANSPORTATION (CONTINUED) AIR TRAFFIC AND GENERAL OPERATING... § 91.1037 Large transport category airplanes...direction, in still air. (2) The airplane...engine powered large transport category airplane...

2013-01-01

425

14 CFR 91.1037 - Large transport category airplanes: Turbine engine powered; Limitations; Destination and...  

Code of Federal Regulations, 2011 CFR

...2011-01-01 false Large transport category airplanes...TRANSPORTATION (CONTINUED) AIR TRAFFIC AND GENERAL OPERATING... § 91.1037 Large transport category airplanes...direction, in still air. (2) The airplane...engine powered large transport category airplane...

2011-01-01

426

14 CFR 91.1037 - Large transport category airplanes: Turbine engine powered; Limitations; Destination and...  

Code of Federal Regulations, 2012 CFR

...2012-01-01 false Large transport category airplanes...TRANSPORTATION (CONTINUED) AIR TRAFFIC AND GENERAL OPERATING... § 91.1037 Large transport category airplanes...direction, in still air. (2) The airplane...engine powered large transport category airplane...

2012-01-01

427

14 CFR 135.375 - Large transport category airplanes: Reciprocating engine powered: Landing limitations...  

Code of Federal Regulations, 2011 CFR

...2011-01-01 false Large transport category airplanes...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS... § 135.375 Large transport category airplanes...engine powered large transport category airplane...favorable direction in still air. (2) The...

2011-01-01

428

14 CFR 91.1037 - Large transport category airplanes: Turbine engine powered; Limitations; Destination and...  

...2014-01-01 false Large transport category airplanes...TRANSPORTATION (CONTINUED) AIR TRAFFIC AND GENERAL OPERATING... § 91.1037 Large transport category airplanes...direction, in still air. (2) The airplane...engine powered large transport category airplane...

2014-01-01

429

14 CFR 135.387 - Large transport category airplanes: Turbine engine powered: Landing limitations: Alternate airports.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false Large transport category airplanes: Turbine...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.387 Large transport category airplanes: Turbine...turbine engine powered large transport category airplane...

2013-01-01

430

14 CFR 135.387 - Large transport category airplanes: Turbine engine powered: Landing limitations: Alternate airports.  

...2014-01-01 false Large transport category airplanes: Turbine...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.387 Large transport category airplanes: Turbine...turbine engine powered large transport category airplane...

2014-01-01

431

14 CFR 135.379 - Large transport category airplanes: Turbine engine powered: Takeoff limitations.  

...2014-01-01 false Large transport category airplanes: Turbine...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.379 Large transport category airplanes: Turbine...turbine engine powered large transport category airplane may...

2014-01-01

432

14 CFR 135.375 - Large transport category airplanes: Reciprocating engine powered: Landing limitations...  

Code of Federal Regulations, 2010 CFR

...2010-01-01 false Large transport category airplanes...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS... § 135.375 Large transport category airplanes...engine powered large transport category airplane...favorable direction in still air. (2) The...

2010-01-01

433

14 CFR 135.365 - Large transport category airplanes: Reciprocating engine powered: Weight limitations.  

Code of Federal Regulations, 2010 CFR

...2010-01-01 false Large transport category airplanes: Reciprocating...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.365 Large transport category airplanes: Reciprocating...reciprocating engine powered large transport category airplane from...

2010-01-01

434

14 CFR 135.379 - Large transport category airplanes: Turbine engine powered: Takeoff limitations.  

Code of Federal Regulations, 2012 CFR

...2012-01-01 false Large transport category airplanes: Turbine...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.379 Large transport category airplanes: Turbine...turbine engine powered large transport category airplane may...

2012-01-01

435

14 CFR 135.387 - Large transport category airplanes: Turbine engine powered: Landing limitations: Alternate airports.  

Code of Federal Regulations, 2010 CFR

...2010-01-01 false Large transport category airplanes: Turbine...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.387 Large transport category airplanes: Turbine...turbine engine powered large transport category airplane...

2010-01-01

436

14 CFR 135.385 - Large transport category airplanes: Turbine engine powered: Landing limitations: Destination...  

Code of Federal Regulations, 2012 CFR

...2012-01-01 false Large transport category airplanes...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS... § 135.385 Large transport category airplanes...engine powered large transport category airplane...direction, in still air. (2) The...

2012-01-01

437

14 CFR 135.387 - Large transport category airplanes: Turbine engine powered: Landing limitations: Alternate airports.  

Code of Federal Regulations, 2011 CFR

...2011-01-01 false Large transport category airplanes: Turbine...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.387 Large transport category airplanes: Turbine...turbine engine powered large transport category airplane...

2011-01-01

438

14 CFR 135.365 - Large transport category airplanes: Reciprocating engine powered: Weight limitations.  

Code of Federal Regulations, 2012 CFR

...2012-01-01 false Large transport category airplanes: Reciprocating...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.365 Large transport category airplanes: Reciprocating...reciprocating engine powered large transport category airplane from...

2012-01-01

439

14 CFR 135.385 - Large transport category airplanes: Turbine engine powered: Landing limitations: Destination...  

Code of Federal Regulations, 2011 CFR

...2011-01-01 false Large transport category airplanes...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS... § 135.385 Large transport category airplanes...engine powered large transport category airplane...direction, in still air. (2) The...

2011-01-01

440

14 CFR 135.385 - Large transport category airplanes: Turbine engine powered: Landing limitations: Destination...  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false Large transport category airplanes...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS... § 135.385 Large transport category airplanes...engine powered large transport category airplane...direction, in still air. (2) The...

2013-01-01

441

14 CFR 135.375 - Large transport category airplanes: Reciprocating engine powered: Landing limitations...  

...2014-01-01 false Large transport category airplanes...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS... § 135.375 Large transport category airplanes...engine powered large transport category airplane...favorable direction in still air. (2) The...

2014-01-01

442

14 CFR 135.379 - Large transport category airplanes: Turbine engine powered: Takeoff limitations.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false Large transport category airplanes: Turbine...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR...Limitations § 135.379 Large transport category airplanes: Turbine...turbine engine powered large transport category airplane may...

2013-01-01

443

Exhaust Emissions Test Airesearch Aircraft Propulsion and Auxiliary Power Gas Turbine Engines.  

National Technical Information Service (NTIS)

The report describes the test setup, procedure, and analysis of exhaust emissions measurement conducted on 32 commercial gas turbine engines comprised of both on-board aircraft auxiliary power and aircraft propulsion production, overhaul, and development ...

1971-01-01

444

User Preferred Fire Extinguishing Agents for Engine and Auxiliary Power Unit (APU) Compartments.  

National Technical Information Service (NTIS)

The results of the 'User Preferred Agent for Engine and Auxiliary Power Unit (APU) Compartment Fire Extinguishing System' survey sent to airlines and airframe manufacturers are compiled in this report.

H. K. Mehta J. Benedictus J. Blackburn B. Dunker T. Grabow

1996-01-01

445

Engineering Design: A Powerful Influence on the Business Success on Manufacturing Industry.  

National Technical Information Service (NTIS)

Engineering design, one of the most powerful forces in producing a package which matches market need, is discussed. It is essentially a detailed planning process backed by analysis and demonstration. The need for innovation to achieve competitive edge and...

J. F. Coplin

1990-01-01

446

Public attitude to possibility of the nuclear power engineering development in the Republic of Belarus.  

National Technical Information Service (NTIS)

To estimate the public attitude of the Belarus population to possible ways of overcoming of energy crisis and, in particular, to nuclear power engineering development in the republic, Institute of Sociology, the Belarus Training, Research and Information ...

E. M. Babosov A. M. Grishchenko A. A. Mikhalevich N. M. Grusha A. I. Stavrov

1996-01-01

447

Exploratory power of the harmony search algorithm: analysis and improvements for global numerical optimization.  

PubMed

The theoretical analysis of evolutionary algorithms is believed to be very important for understanding their internal search mechanism and thus to develop more efficient algorithms. This paper presents a simple mathematical analysis of the explorative search behavior of a recently developed metaheuristic algorithm called harmony search (HS). HS is a derivative-free real parameter optimization algorithm, and it draws inspiration from the musical improvisation process of searching for a perfect state of harmony. This paper analyzes the evolution of the population-variance over successive generations in HS and thereby draws some important conclusions regarding the explorative power of HS. A simple but very useful modification to the classical HS has been proposed in light of the mathematical analysis undertaken here. A comparison with the most recently published variants of HS and four other state-of-the-art optimization algorithms over 15 unconstrained and five constrained benchmark functions reflects the efficiency of the modified HS in terms of final accuracy, convergence speed, and robustness. PMID:20423806

Das, Swagatam; Mukhopadhyay, Arpan; Roy, Anwit; Abraham, Ajith; Panigrahi, Bijaya K

2011-02-01

448

Theta13 Neutrino Experiment at the Diablo Canyon Power Plant, LBNL Engineering Summary Report  

Microsoft Academic Search

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 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

Oshatz; Daryl

2004-01-01

449

Study of In-Cylinder Reactions of High Power-Density Direct Injection Diesel Engines.  

National Technical Information Service (NTIS)

Direct-injection (DI) Diesel or compression-ignition (CI) engine combustion process is investigated when new design and operational strategies are employed in order to achieve a high power-density (HPD) engine. This goal is being achieved by developing qu...

M. Jansons, S. Lin, K. T. Rhee

2004-01-01

450

Alternative to chrome: HVOF cermet coatings for high horse power diesel engines  

Microsoft Academic Search

High velocity oxygen fuel sprayed face coatings have shown great promise for piston rings used for high power density diesel engines. Various coatings have been tested on both wear test rigs and in an engine. A highly dense HVOF cermet coating was developed with reasonable crack resistance during service. The HVOF coated piston rings wore three to six tunes lower

F. Rastegar; D. E. Richardson

1997-01-01

451

Method of operating a thermal engine powered by a chemical reaction  

DOEpatents

The invention involves a novel method of increasing the efficiency of a thermal engine. Heat is generated by a non-linear chemical reaction of reactants, said heat being transferred to a thermal engine such as Rankine cycle power plant. The novel method includes externally perturbing one or more of the thermodynamic variables of said non-linear chemical reaction. 7 figs.

Ross, J.; Escher, C.

1988-06-07

452

Grids as Production Computing Environments: The Engineering Aspects of NASA's Information Power Grid  

Microsoft Academic Search

Information Power Grid (IPG) is the name of NASA's project to build a fully distributed computing and data management environment - a Grid. The IPG project has near, medium, and long-term goals that represent a continuum of engineering, development, and research topics. The overall goal is to provide the NASA scientific and engineering communities a substantial increase in their ability

William E. Johnston; Dennis Gannon; Bill Nitzberg

1999-01-01

453

ColumbuScout: towards building local search engines over large databases  

Microsoft Academic Search

In many database applications, search is still executed via form based query interfaces, which are then translated into SQL statements to find matching records. Ranking is usually not implemented unless users have explicitly indicated how to rank the matching records, e.g., in the ascending order of year. Often, this approach is neither intuitive nor user friendly (especially with many search

Cody Hansen; Feifei Li

2012-01-01

454

Engineering Note FluCaP: A Heuristic Search Planner for First-Order MDPs  

Microsoft Academic Search

We present a heuristic search algorithm for solving first-order Markov Decision Pro- cesses (FOMDPs). Our approach combines first-order state abstraction that avoids eval- uating states individually, and heuristic search that avoids evaluating all states. Firstly, in contrast to existing systems, which start with propositionalizing the FOMDP and then perform state abstraction on its propositionalized version we apply state abstraction di-

Holldobler Steen; Eldar Karabaev; Olga Skvortsova

2006-01-01

455

Use of Gas Engines in Unit Type Heating Power Plants.  

National Technical Information Service (NTIS)

A definition of the terms central and decentral heat-power coupling is followed by the use and mode of functioning of combined heating and power stations which work on the basis of decentral heat-power coupling. The appropriate units as well as the dimens...

H. Drexler

1978-01-01

456

Primary electric power generation systems for advanced-technology engines  

NASA Technical Reports Server (NTRS)

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

Cronin, M. J.

1983-01-01

457

Low power and cost effective scaling engine with locking frame rate for display controllers  

Microsoft Academic Search

Embedded memory typically requires significant silicon chip area, and in the case of display controller chip designs with a locking frame rate, it entails high power consumption. In this paper, we introduce a low- power cost-effective scaling engine with locking frame rate, with reduced memory capacity requirements. Using our proposed H-V scaling direction-interchangeable architecture, the scaling engine can dynamically adjust

Chung-Hsun Huang; Chao-Yang Chang

2011-01-01

458

Steam engines. (Latest citations from the US Patent bibliographic file with exemplary claims). Published Search  

SciTech Connect

The bibliography contains citations of selected patents concerning steam engines. The patents detail water spray injecter system, internal combustion, reaction chamber, valveless bi-chamber, multicylinder, steam recovery and recompression, sound simulator, oscillating, and rotary steam engines. (Contains 50-250 citations and includes a subject term index and title list.) (Copyright NERAC, Inc. 1995)

NONE

1995-09-01

459

Use of ceramics in engine components. (Latest citations from Ceramic Abstracts database). Published Search  

SciTech Connect

The bibliography contains citations concerning manufacturing processes, testing, design, and stress analysis of ceramic engine parts and coatings. Topics include slip casting, reaction sintering, hot isostatic pressing, injection molding, and plasma spraying processes. The citations also consider advantages of using ceramic engine components in automotive, military, and aircraft applications. (Contains a minimum of 116 citations and includes a subject term index and title list.)

Not Available

1994-12-01

460

Use of ceramics in engine components. (Latest citations from ceramic abstracts database). Published Search  

SciTech Connect

The bibliography contains citations concerning manufacturing processes, testing, design, and stress analysis of ceramic engine parts and coatings. Topics include slip casting, reaction sintering, hot isostatic pressing, injection molding, and plasma spraying processes. The citations also consider advantages of using ceramic engine components in automotive, military, and aircraft applications. (Contains a minimum of 116 citations and includes a subject term index and title list.)

Not Available

1994-01-01

461

The Space Physics Archive Search Engine (SPASE) Project for Sun-Earth Connection Data Finding and Retrieval  

NASA Astrophysics Data System (ADS)

The diversity of space physics data available electronically has become so great that it is difficult to keep track of what information exists. With current technology it is possible, however, to provide an easy way to determine the existence and location of data of interest via queries to network services with a relatively simple user interface. An international group of space physics data centers is developing such an interface system, called the Space Physics Archive Search Engine (SPASE). Many comprehensive lists of URL's have been put together to provide a minimal search capability for space physics data. One recent effort to gather a list of data sources resulted in an assembly of nearly 100 URL's and many important archives had still been missed. These lists are difficult to maintain and change constantly. However, even with these lists it is not possible to ask a simple question such as "where can I find observations near the polar cusp in 1993?" without doing extensive, manual searches on separate data services. The only hope for a comprehensive, automated search service is to have data centers/archives make their own information available to users in a manner that will facilitate multi-archive searching. Nearly all space physics data providers have WWW services that allow at least a basic search capability, and many also provide more specialized interfaces that support complex queries and/or complex data structures, but each of these services is different. The SPASE effort is creating a simple, XML-based common search capability and a common data dictionary that would allow users to search all participating archives with topics and time frames such as "polar cusp" and "the year 1993". The result would be a list of archives with relevant data. More advanced services at later stages of the project would allow intercomparison of search results to find, for example, overlapping data intervals. Retrieval of the relevant data would also be supported. The first stages of the project are based on testing existing software applications such as the Object Oriented Data Technology (OODT - see http://oodt.jpl.nasa.gov/about.html) for applicability. The initial effort also includes the derivation of a common data dictionary for facilitating the searches. The current state of these efforts and plans for the future will be reviewed.

Thieman, J. R.

2002-12-01

462

Magnetohydrodynamics (MHD) engineering test facility (ETF) 200 MWe power plant: conceptual design engineering report (CDER). Volume 1. Executive summary  

SciTech Connect

The reference conceptual design of the MHD Engineering Test Facility (ETF), a prototype 200 MWe coal-fired electric generating plant designed to demonstrate the commercial feasibility of open cycle MHD is summarized. Main elements of the design are identified and explained, and the rationale behind them is 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. This report integrates the latest (1980-1981) information from the MHD technology program with the elements of a conventional steam power electric generating plant. It is presented in five volumes.

Not Available

1981-09-01

463

Materials for Advanced Turbine Engines. Volume 1; Power Metallurgy Rene 95 Rotating Turbine Engine Parts  

NASA Technical Reports Server (NTRS)

An attempt was made to improve methods for producing powder metallurgy aircraft gas turbine engine parts from the nickel base superalloy known as Rene 95. The parts produced were the high pressure turbine aft shaft for the CF6-50 engine and the stages 5 through 9 compressor disk forgings for the CFM56/F101 engines. A 50% cost reduction was achieved as compared to conventional cast and wrought processing practices. An integrated effort involving several powder producers and a major forging source were included.

Pfouts, W. R.; Shamblen, C. E.; Mosier, J. S.; Peebles, R. E.; Gorsler, R. W.

1979-01-01

464

Voltage and Reactive Power Control Taking into Account of Economy and Security by using Tabu Search  

NASA Astrophysics Data System (ADS)

Due to deregulation of electric power market, the several power transactions and the distributed generators will increase year by year. The power flow in power system will vary increasingly more complex and more uncertain by them. So it is difficult for Voltage and reactive power(Q) Control (VQC) to sustain the adequate voltages in the power system. On the other hand, the economy and security are requested for power system operation and control under the competitive environment. The optimization algorithm is effective to satisfy these trade-off problem. The optimization of VQC traces the combinational optimization problem with shunt devices, transformer tap and generator terminal voltage. Tabu Search (TS), which is one of meta-heuristic approaches, is suitable for the optimization problem of VQC. Because it is able to deal with the discrete variables such as shunt devices easily and it needs few tuning parameters. In this paper, in order to realize flexible VQC which responds to the uncertain power flow with competitive environment, we propose the optimization of VQC with TS algorithm taking into account of both economy and security. The security is considered as the minimization of generator reactive outputs and transformer tap positions difference from the neutral. Moreover, the novel neighborhood condition setting focused on the control interference between voltage control equipments is applied to minimizing the objective function. It is confirmed by several numerical simulations using IEEE 14 and 57 bus system that the proposed scheme is able to ensure the security and to find the useful optimal solution efficiently.

Nakachi, Yoshiki; Kato, Atsushi; Ukai, Hiroyuki

465

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

SciTech Connect

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.

Bowyer, J.M.

1984-04-15

466

Space Shuttle Main Engine Off-Nominal Low Power Level Operation  

NASA Technical Reports Server (NTRS)

This paper describes Rocketdyne's successful analysis and demonstration of the Space Shuttle Main Engine (SSME) operation at off-nominal power levels during Reusable Launch Vehicle (RLV) evaluation tests. The nominal power level range for the SSME is from 65% rated power level (RPL) to 109% RPL. Off-nominal power levels incrementally demonstrated were: 17% RPL, 22% RPL, 27% RPL, 40% RPL, 45% RPL, and 50% RPL. Additional achievements during low power operation included: use of a hydrostatic bearing High Pressure Oxidizer Turbopump (HPOTP), nominal High Pressure Fuel Turbopump (HPFTP) first rotor critical speed operation, combustion stability at low power levels, and refined definition of nozzle flow separation heat loads.

Bradley, Michael

1997-01-01

467

A scalable real-time search engine for fast retrieval of social media content  

Microsoft Academic Search

The world wide web of today publishes a great number of real-time content, causing the increasing need for a differentiated way of searching. In this paper, three issues related to retrieving real-time content are presented, and their applications are proposed. First, the characteristics of real-time content, as well as the concept of real-time search are introduced. Second, the real-time technologies

Yong-seok Yang; Kwanho Kim; Beom-suk Chung; Jonghun Park

2011-01-01

468

The performance of solar thermal electric power systems employing small heat engines  

NASA Technical Reports Server (NTRS)

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.

Pons, R. L.

1980-01-01

469

Jet engine powers large, high-temperature wind tunnel  

NASA Technical Reports Server (NTRS)

Wind tunnel for large component testing uses a jet engine with afterburner to provide high temperatures /1200 degrees to 2000 degrees F/ and controlled high velocity gas. This economical wind tunnel can accommodate parts ten feet by ten feet or larger, and is a useful technique for qualitative information.

Benham, T. F.; Mulliken, S. R.

1967-01-01

470

Do economic equality and generalized trust inhibit academic dishonesty? Evidence from state-level search-engine queries.  

PubMed

What effect does economic inequality have on academic integrity? Using data from search-engine queries made between 2003 and 2011 on Google and state-level measures of income inequality and generalized trust, I found that academically dishonest searches (queries seeking term-paper mills and help with cheating) were more likely to come from states with higher income inequality and lower levels of generalized trust. These relations persisted even when controlling for contextual variables, such as average income and the number of colleges per capita. The relation between income inequality and academic dishonesty was fully mediated by generalized trust. When there is higher economic inequality, people are less likely to view one another as trustworthy. This lower generalized trust, in turn, is associated with a greater prevalence of academic dishonesty. These results might explain previous findings on the effectiveness of honor codes. PMID:22421204

Neville, Lukas

2012-04-01

471

Ceramic engine components. (Latest citations from the US Patent database). Published Search  

SciTech Connect

The bibliography contains citations of selected patents concerning ceramic materials that are used in internal combustion engines. The citations refer to materials whose properties include resistance to heat, wear, and corrosion. Fabrication techniques of ignition system components, combustion chamber parts, exhaust valves, turbine rotors and stators, turbine blades, and heat exchangers are discussed. Ceramic metal composites suitable for engine components are also considered. (Contains a minimum of 175 citations and includes a subject term index and title list.)

Not Available

1993-07-01

472

In search for a widely applicable and accepted software quality model for software quality engineering  

Microsoft Academic Search

Software Quality Engineering is an emerging discipline that is concerned with improving the approach to software quality.\\u000a It is important that this discipline be firmly rooted in a quality model satisfying its needs. In order to define the needs\\u000a of this discipline, the meaning of quality is broadly defined by reviewing the literature on the subject. Software Quality\\u000a Engineering needs

Marc-alexis Côté; Witold Suryn; Elli Georgiadou

2007-01-01

473

Use of ceramics in engine components. (Latest citations from Ceramic abstracts database). Published Search  

SciTech Connect

The bibliography contains citations concerning manufacturing processes, testing, design, and stress analysis of ceramic engine parts and coatings. Topics include slip casting, reaction sintering, hot isostatic pressing, injection molding, and plasma spraying processes. The citations also consider advantages of using ceramic engine components in automotive, military, and aircraft applications. (Contains 50-250 citations and includes a subject term index and title list.) (Copyright NERAC, Inc. 1995)

NONE

1996-08-01

474

Silicon carbide whisker composites. (Latest citations from Engineered Materials abstracts). NewSearch  

SciTech Connect

The bibliography contains citations concerning the manufacture and applications of silicon carbide whisker reinforced composites. Citations discuss the preparation of whiskers and the processing of composites containing the whiskers. Applications include aerospace engines, automotive components, engine components, and surgical implants. Physical properties such as bending strength, crack propagation, creep, fracture toughness, and stress strain curves are covered. Ceramic matrix, metal matrix, and carbon-carbon composites are examined. (Contains a minimum of 248 citations and includes a subject term index and title list.)

Not Available

1994-11-01

475

Space shuttle engineering and operations support. Orbiter to spacelab electrical power interface. Avionics system engineering  

NASA Technical Reports Server (NTRS)

The results are presented of an investigation of the factors which affect the determination of Spacelab (S/L) minimum interface main dc voltage and available power from the orbiter. The dedicated fuel cell mode of powering the S/L is examined along with the minimum S/L interface voltage and available power using the predicted fuel cell power plant performance curves. The values obtained are slightly lower than current estimates and represent a more marginal operating condition than previously estimated.

Emmons, T. E.

1976-01-01

476

Review of the Mechanical Engineering Challenges associated with the SNS* Power Ramp Up  

Microsoft Academic Search

Since commissioning of the SNS in April 2006 the beam power has been steadily increasing towards the design intensity of 1.4 MW. Several areas of the accelerator have been shown to require modifications, upgrades or new designs of mechanical equipment to support the power ramp schedule. This paper presents mechanical engineering design work implemented since initial commissioning along with a

Graeme R Murdoch; Mike Holding; Peter Ladd; Kerry G Potter; Roseberry Jr. R Tom

2008-01-01

477

Results from Baseline Tests of the SPRE (Space Power Research Engine) 1 and Comparison with Code Model Predictions.  

National Technical Information Service (NTIS)

The space power research engine (SPRE), a free piston Stirling engine with linear alternator, is being tested at NASA-Lewis as a candidate for high capacity space power. Results are presented of baseline engine tests at design and off-design operating con...

J. E. Cairelli, S. M. Geng, R. C. Skupinski

1989-01-01

478

Contingency power for a small turboshaft engine by using water injection into turbine cooling air  

NASA Technical Reports Server (NTRS)

Because of one-engine-inoperative (OEI) requirements, together with hot-gas reingestion and hot-day, high-altitude take-off situations, power augmentation for multiengine rotorcraft has always been of critical interest. However, power augmentation by using overtemperature at the turbine inlet will shorten turbine life unless a method of limiting thermal and mechanical stress is found. A possible solution involves allowing the turbine inlet temperature to rise to augment power while injecting water into the turbine cooling air to limit hot-section metal temperatures. An experimental water injection device was installed in an engine and successfully tested. Although concern for unprotected subcomponents in the engine hot section prevented demonstration of the technique's maximum potential, it was still possible to demonstrate increases in power while maintaining nearly constant turbine rotor blade temperature.

Biesiadny, Thomas J.; Klann, Gary A.

1992-01-01

479

Contingency power for small turboshaft engines using water injection into turbine cooling air  

NASA Technical Reports Server (NTRS)

Because of one engine inoperative requirements, together with hot-gas reingestion and hot day, high altitude takeoff situations, power augmentation for multiengine rotorcraft has always been of critical interest. However, power augmentation using overtemperature at the turbine inlet will shorten turbine life unless a method of limiting thermal and mechanical stresses is found. A possible solution involves allowing the turbine inlet temperature to rise to augment power while injecting water into the turbine cooling air to limit hot-section metal temperatures. An experimental water injection device was installed in an engine and successfully tested. Although concern for unprotected subcomponents in the engine hot section prevented demonstration of the technique's maximum potential, it was still possible to demonstrate increases in power while maintaining nearly constant turbine rotor blade temperature.

Biesiadny, Thomas J.; Klann, Gary A.; Clark, David A.; Berger, Brett

1987-01-01

480

Regulation of power plant siting: decision making in search of the public interest  

SciTech Connect

This study focuses on effects of various institutional arrangements, political processes, and behaviors on regulatory decisions concerning selection of sites for new bulk electric power facilities. Theories of regulation are critically reviewed for their contribution to the study of power plant siting as a political problem, and found to be less adequate than recent models of policy implementation for this purpose. A descriptive model of policy implementation is synthesized from the literature and combined with a set of explicit criteria for evaluation of regulatory decision making procedures. A normative concept of searching for the public interest is presented as an operational goal for public decision makers and scholarly policy researchers. This concept is made operational for public administrators through structuring of decision making procedures, organizational and interorganizational relationships, and socialization of decision makers. State public utility commission procedures for certification of sites for new electric facilities are examined in Colorado, New Mexico and Utah in the context of actual multistate industry operations, and found to be deficient in structuring a search for the public interest. Alternative institutional arrangements for regulating siting decisions are surveyed, including preemptive centralization, socioeconomic impact assistance, ad hoc dispute settlement, open planning, and joint reviews.

Hamilton, M.S.

1984-01-01

481

Maximum-power quantum-mechanical Carnot engine  

Microsoft Academic Search

In their work [J. Phys. AJPHAC50305-447010.1088\\/0305-4470\\/33\\/24\\/302 33, 4427 (2000)], Bender, Brody, and Meister have shown by employing a two-state model of a particle confined in the one-dimensional infinite potential well that it is possible to construct a quantum-mechanical analog of the Carnot engine through changes of both the width of the well and the quantum state in a specific manner.

Sumiyoshi Abe

2011-01-01

482

Maximum-power quantum-mechanical Carnot engine  

Microsoft Academic Search

In their work [J. Phys. A: Math. Gen. 33, 4427 (2000)], Bender, Brody, and\\u000aMeister have shown by employing a two-state model of a particle confined in the\\u000aone-dimensional infinite potential well that it is possible to construct a\\u000aquantum-mechanical analog of the Carnot engine through the changes of both the\\u000awidth of the well and the quantum state in

Sumiyoshi Abe

2010-01-01

483

Magnetohydrodynamics (MHD) Engineering Test Facility (ETF) 200 MWe power plant. Conceptual Design Engineering Report (CDER). Volume 1: Executive summary  

NASA Technical Reports Server (NTRS)

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.

1981-01-01

484

Rankine engine solar power generation. I - Performance and economic analysis  

NASA Technical Reports Server (NTRS)

Results of a computer simulation of the performance of a solar flat plate collector powered electrical generation system are presented. The simulation was configured to include locations in New Mexico, North Dakota, Tennessee, and Massachusetts, and considered a water-based heat-transfer fluid collector system with storage. The collectors also powered a Rankine-cycle boiler filled with a low temperature working fluid. The generator was considered to be run only when excess solar heat and full storage would otherwise require heat purging through the collectors. All power was directed into the utility grid. The solar powered generator unit addition was found to be dependent on site location and collector area, and reduced the effective solar cost with collector areas greater than 400-670 sq m. The sites were economically ranked, best to worst: New Mexico, North Dakota, Massachusetts, and Tennessee.

Gossler, A. A.; Orrock, J. E.

1981-01-01

485

Electric "Power and Energy" Engineering Education in USA  

NSDL National Science Digital Library

The Advanced Technology Environmental and Energy Center (ATEEC) provides this presentation from P.K. Sen on trends in renewable energy, electricity and power. The presentation includes many graphical representations of data and information on different applications of power. The document may be downloaded in PDF file format. Users must download this resource for viewing, which requires a free log-in. There is no cost to download the item.

Sen, P. K.

2012-10-02

486

Optimizing power cylinder lubrication on a large bore natural gas engine  

NASA Astrophysics Data System (ADS)

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.

Luedeman, Matthew R.

487

Silicon carbide whisker composites. (Latest citations from Engineered Materials abstracts). Published Search  

SciTech Connect

The bibliography contains citations concerning the manufacture and applications of silicon carbide whisker reinforced composites. Citations discuss the preparation of whiskers and the processing of composites containing the whiskers. Applications include aerospace engines, automotive components, engine components, and surgical implants. Physical properties such as bending strength, crack propagation, creep, fracture toughness, and stress strain curves are covered. Ceramic matrix, metal matrix, and carbon-carbon composites are examined. (Contains 50-250 citations and includes a subject term index and title list.) (Copyright NERAC, Inc. 1995)

NONE

1996-02-01

488

From Sshh to Search Engine: Reference.net on the World Wide Web.  

ERIC Educational Resources Information Center

Describes the development of the Collaborative Digital Reference Service (CDRS) by the Library of Congress and partner libraries that provides professional reference service to users through an international digital network of libraries. Discusses the benefits of searching library collections rather than just Internet sources and considers future…

Kresh, Diane Nester

2001-01-01

489

A game engine based simulation of the NIST urban search and rescue arenas  

Microsoft Academic Search

We are developing interactive simulations of the National Institute of Standards and Technology (NIST) Reference Test Facility for Autonomous Mobile Robots (Urban Search and Rescue). The NIST USAR Test Facility is a standardized disaster environment consisting of three scenarios of progressive difficulty: Yellow, Orange, and Red arenas. The USAR task focuses on robot behaviors, and physical interaction with standardized but

Jijun Wang; Michael Lewis; Jeffrey Gennari

2003-01-01

490

A Fully Automated Content Based Video Search Engine Supporting Spatio-Temporal Queries  

Microsoft Academic Search

The rapidity with which digital information, particularlyvideo, is being gener- ated, has necessitated the development of tools for efficien t search of these media. Content based visual queries have been primarily focused on still image retrieval. In this paper, we propose a novel, interactive system on the W eb, based on the visual paradigm, with spatio-temporal attributes playinga key role

Shih-Fu Chang; William Chen; Horace J. Meng; Hari Sundaram

1997-01-01

491

Image Digestion and Relevance Feedback in the ImageRover WWW Search Engine  

Microsoft Academic Search

ImageRover is a search by image content navigation tool for the world wide web. The staggering size of the WWW dictates certain strategies and algorithms for image collection, digestion, indexing, and user interface. This pa- per describes two key components of the ImageRover strat- egy: image digestion and relevance feedback. Image di- gestion occurs during image collection; robots digest the

Leonid Taycher; Marco La Cascia

1997-01-01

492

A fully automated content-based video search engine supporting spatiotemporal queries  

Microsoft Academic Search

The rapidity with which digital information, particularly video, is being generated has necessitated the development of tools for efficient search of these media. Content-based visual queries have been primarily focused on still image retrieval. In this paper, we propose a novel, interactive system on the Web, based on the visual paradigm, with spatiotemporal attributes playing a key role in video

Shih-Fu Chang; William Chen; Horace J. Meng; Hari Sundaram; Di Zhong

1998-01-01

493

Commercialization of coal diesel engines for non-utility and export power markets  

SciTech Connect

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.

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

494

National Electrical Code in Power Engineering Course for Electrical Engineering Curriculum  

ERIC Educational Resources Information Center

In order to ensure the safety of their inhabitants and properties, the residential, industrial and business installations require complying with NEC (national electrical code) for electrical systems. Electrical design engineers and technicians rely heavily on these very important design guidelines. However, these design guidelines are not formally…

Azizur, Rahman M. M.

2011-01-01

495

TEPCO's Approach to Power-Engineer Human Resource Development  

NASA Astrophysics Data System (ADS)

We think 'human resources and technology' is developed only by self-training continuously, keeping higher motivation and practicing repeatedly. Moreover it is indispensable for sustainable development of company. Management vision, top-down message with vertical communication, and bottom-up systematic approaches are necessary for sustainable human resource development, sharing the value with coordination, and in addition, OJT and Off-JT method should be used effectively. This paper shows TEPCO's attempts to develop engineers' technical skills as a reference of a in-company continuing professional development.

Sato, Masaki

496

Materials selection for automotive engines. (Latest citations from Metadex). Published Search  

SciTech Connect

The bibliography contains citations concerning material selection and substitution for automobile engines. Mechanical properties, including dimensional stability, are reviewed. Machined parts, castings, forgings, and extrusions are examined. Citations concerning automotive bodies, frames, and structures are presented in a separate bibliography.(Contains 50-250 citations and includes a subject term index and title list.) (Copyright NERAC, Inc. 1995)

NONE

1995-12-01

497

Materials selection for automotive engines. (Latest citations from Metadex). Published Search  

SciTech Connect

The bibliography contains citations concerning material selection and substitution for automobile engines. Mechanical properties, including dimensional stability, are reviewed. Machined parts, castings, forgings, and extrusions are examined. Citations concerning automotive bodies, frames, and structures are presented in a separate bibliography.(Contains 50-250 citations and includes a subject term index and title list.) (Copyright NERAC, Inc. 1995)

NONE

1997-04-01

498

Space Shuttle main engine OPAD: The search for a hardware enhanced plume  

Microsoft Academic Search

The process of applying spectroscopy to the Space Shuttle Main Engine (SSME) for plume diagnostics, as it exists today, originated at Marshall Space Flight Center in Huntsville, Alabama, and its implementation was assured largely through the efforts of Sverdrup AEDC, in Tullahoma, Tennessee. This team continues to lead and guide efforts in the plume diagnostics arena. The process, Optical Plume

W. T. Powers; A. E. Cooper; Tim L. Wallace; W. L. Buntine; K. W. Whitaker

1993-01-01