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Littérature scientifique sur le sujet « OPAC systems »

Auteur : Grafiati

Publié le 10 mars 2023

Mis à jour le 31 juillet 2025

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Articles de revues sur le sujet "OPAC systems"

Wells, David. "Online Public Access Catalogues and Library Discovery Systems." KNOWLEDGE ORGANIZATION 48, no. 6 (2021): 457–66. http://dx.doi.org/10.5771/0943-7444-2021-6-457.

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This article provides an overview of computer based catalogue systems designed for use by library clients, seeing present day ‘discovery systems’ on the same trajectory as the older ‘online public access catalogues’ (OPACs) which they are gradually replacing, both in technical development and their approach to client use scenarios. It traces the history of the OPAC/discovery system from its origins in the library automation of the 1960s through to the present and discusses the main technical standards which have formed its development. The article goes on to consider questions relating to the

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Mi, Jia, and Cathy Weng. "Revitalizing the Library OPAC: Interface, Searching, and Display Challenges." Information Technology and Libraries 27, no. 1 (2008): 5. http://dx.doi.org/10.6017/ital.v27i1.3259.

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The behavior of academic library users has drastically changed in recent years. Internet search engines have become the preferred tool over the library online public access catalog (OPAC) for finding information. Libraries are losing ground to online search engines. In this paper, two aspects of OPAC use are studied: (1) the current OPAC interface and searching capabilities, and (2) the OPAC bibliographic display. The purpose of the study is to find answers to the following questions: Why is the current OPAC ineffective? What can libraries and librarians do to deliver an OPAC that is as good a

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Chung, Ada Chi Wai, and Dickson K. W. Chiu. "OPAC Usability Problems of Archives." International Journal of Systems and Service-Oriented Engineering 6, no. 1 (2016): 54–70. http://dx.doi.org/10.4018/ijssoe.2016010104.

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This study aims to explore common pitfalls of design and functional issues of Open Public Access Catalogue (OPAC) systems for archives for the general public and suggest solutions to approach such problems. Other than general users, this study also suggests ways to enhance the OPAC system to make it more user-friendly to users with special needs, such as the elderly and children. This paper uses a case study approach to evaluate the usability of the OPAC system in the Hong Kong Film Archive (HKFA), which is a representative and important archive of its type. The paper provides practical insigh

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Kapoor, Kanta, and O. P. Goyal. "Web‐based OPACs in Indian academic libraries: a functional comparison." Program 41, no. 3 (2007): 291–309. http://dx.doi.org/10.1108/00330330710774165.

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PurposeThe paper seeks to provide a comparative analysis of the functionality of five web‐based OPACs available in Indian academic libraries.Design/methodology/approachSame‐topic searches were carried out by three researchers on the web‐based OPACs of Libsys, VTLS's iPortal, NewGenLib, Troodon, and Alice for Windows, implemented in five academic libraries in India. Their functionality was compared using criteria selected from the literature on OPAC searching.FindingsThe web‐based OPACs investigated offered a range of facilities for searching by author, title, control number and by keywords. Fe

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Lewis, Peter. "Cost Savings and Service Strategies in the British National Bibliographic Service." Alexandria: The Journal of National and International Library and Information Issues 1, no. 2 (1989): 17–26. http://dx.doi.org/10.1177/095574908900100203.

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The British Library launched in 1986 a Catalogue Action Plan to deal with the long-term prospect of declining financial and manpower resources, the absence of growth in the market for its services, an unacceptably large backlog of uncatalogued materials, and a steadily increasing annual output of British publications to be catalogued. The initial phase of the Plan was designed to contain staff costs by reduction and simplification in data content in BNBMARC and other British Library records, predicating their future use primarily in an online (OPAC) environment. It has had significant success

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Andrews, Christina M., S. Manzur Elahi, and James E. Clark. "Evaluation of New Jersey Route 18 OPAC/MIST Traffic-Control System." Transportation Research Record: Journal of the Transportation Research Board 1603, no. 1 (1997): 150–55. http://dx.doi.org/10.3141/1603-19.

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Conventional traffic-control strategies have limitations in handling unanticipated traffic demands. An adaptive traffic-signal control is expected to mitigate this problem and improve overall system performance. Furthermore, with the increasing needs of evolving intelligent transportation systems, traffic signals are expected to provide significantly greater functionalities, which can be achieved only by adaptive control. A product of many years of development, Optimized Policies for Adaptive Control (OPAC) represents a significant step forward in adaptive signal-control research. The OPAC str

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Osborne, Hollie M., and Andrew Cox. "An investigation into the perceptions of academic librarians and students towards next-generation OPACs and their features." Program 49, no. 1 (2015): 23–45. http://dx.doi.org/10.1108/prog-10-2013-0055.

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Purpose – The purpose of this paper is to determine whether features of next-generation Online Public Access Catalogue (OPAC) interfaces are useful and intuitive to users who have different levels of searching ability. In addition, it investigates whether there is a difference between librarians’ and students’ preferences for specific features. Design/methodology/approach – The research is based on 18 semi-structured interviews conducted in July 2012 with three groups of library users from The University of Sheffield: librarians; Master of Arts Librarianship students; and a group of other post

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Y, Chandramohan Reddy, and Madhuri K. "Distributed OPAC System Using Z39.50 Protocol." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 10, no. 5 (2013): 1675–81. http://dx.doi.org/10.24297/ijct.v10i5.4150.

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Online Public Access Catalogue is playing a vital role in Central Libraries and University/College Libraries. Most of the College libraries are using OPAC for easy search and retrieval of the books and it's Status in a Particular Library. The main limitation in the OPAC we are using in current system is; that we are able to search and retrieve the information about the books of that particular library, but not outside of it. When we have a scenario like if we have multiple libraries in a campus, if we need to search a book in all the libraries, we have only two possibilities to build OPAC, onc

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Bennett, Michael J. "OPAC Design Enhancements and Their Effects on Circulation and Resource Sharing within the Library Consortium Environment." Information Technology and Libraries 26, no. 1 (2007): 36. http://dx.doi.org/10.6017/ital.v26i1.3287.

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A longitudinal study of three discrete online public access catalog (OPAC) design enhancements examined the possible effects such changes may have on circulation and resource sharing within the automated library consortium environment. Statistical comparisons were made of both circulation and interlibrary loan (ILL) figures from the year before enhancement to the year after implementation. Data from sixteen libraries covering a seven-year period were studied in order to determine the degree to which patrons may or may not utilize increasingly broader OPAC ILL options over time. Results indicat

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Papadakis, Ioannis, Michalis Stefanidakis, and Aikaterini Tzali. "Visualizing OPAC subject headings." Library Hi Tech 26, no. 1 (2008): 19–23. http://dx.doi.org/10.1108/07378830810857762.

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Thèses sur le sujet "OPAC systems"

姍, 路., and Shan Lu. "Coding and decoding for multiuser communication systems." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12863897/?lang=0, 2014. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12863897/?lang=0.

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本論文は、多端子通信路に対するマルチユーザ符号化および復号の研究成果をまとめたものである。多重接続加算通信路による情報伝送において、複数ユーザの稼働状態を識別するための誤り訂正可能なシグネチャ符号の構成を論ず,全伝送率の高いシグネチャ符号の一般的な構成法を解明する.双方向中継通信路では、2ユーザターボ符号に対する復号の演算量を低減させる復号法を提案する。加法性白色ガウス雑音環境下では復号性能を劣化することなく、レイリーフェージング環境下では僅かな劣化にとどめながら、復号の演算量を約半分程度に低減することができる. Coding and decoding for multiuser communication systems are investigated. For MAAC, we propose a coding scheme of (k + 1)-ary error-correcting signature codes. We give binary and non-binary signature codes. They are the best error-correcting signature codes for MAAC, in the sense that they have highest sum rates known. For TWRC, we pro

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Pentarchou, Konstantina. "Web 2.0 tools integration in Online Public AccessCatalogue (OPAC) : users desires and motivation." Thesis, Linnéuniversitetet, Institutionen för informatik (IK), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-36326.

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This research aimed to investigate the desires of the users of the Greek public Library on Gender and Equality (LGE) about a future Online Public Access Catalogue (OPAC) containing Web2.0 functionalities. The concepts of participation, information pluralism and community building in relation with Web 2.0 tools in libraries’ catalogues were introduced under the theoretical approach provided by Social Critical Theory of Jürgen Habermas. Aqualitative research based on semi-structured interviews with users of the LGE wasconducted and the collected data that were analysed with the thematic analysis

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昌三, 藤原. "Studies on new molten salt systems for high temperature molten salt batteries." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12222785/?lang=0, 2011. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12222785/?lang=0.

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優樹, 西田, and Yuki Nishida. "Studies on linear systems and the eigenvalue problem over the max-plus algebra." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13158503/?lang=0, 2021. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13158503/?lang=0.

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Max-plus代数は，実数全体に無限小元を付加した集合に，加法として最大値をとる演算，乗法として通常の加法を考えた代数系である．本論文では，max-plus線形方程式に対するCramerの公式の類似物を用いて，線形方程式の解空間の基底が構成できることを示した．さらに固有値問題に関連して，max-plus行列の固有ベクトルの概念を2通りの観点から拡張した． The max-plus algebra is the semiring with addition "max" and multiplication "+". In the present thesis, the author gives a combinatorial characterization of solutions of linear systems in terms of the max-plus Cramer's rule. Further, the author extends the concept of eigenvectors of max-plus matrices from two different perspectives. 博士(理学) Doctor of Philosophy in Science 同志社大学 Doshisha University

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エドアード, ラマスホルヘ, and Jorge Eduardo Lamas de Anda. "Conceptual study on the energy independence of fuel cell cogeneration systems using solar energy." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12981850/?lang=0, 2016. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12981850/?lang=0.

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この論文では従来電力系統から自立的に利用出来る太陽エネルギー及び燃料電池コジェネレーションシステムの徹底的な解析が述べられている。開発した水素マイクログリッドの燃料依存を最小化にする数理モデルを利用し日本社会でのさまざまなシナリオのシミュレーションが行なわれた。こういうシステムの実現性が従来水素燃料供給方法の審査及び日本の中型離島の事例研究で評価された。経済的な分析によって石油の価格が高い遠隔な地域では水素マイクログリッドは競争力があると分かった。 This thesis presents a thorough analysis on energy supply systems using solar energy and fuel cell cogeneration systems that can operate reliably and independently from the main power grid. A mathematical model to maximize fuel independence for hydrogen micro-grids is developed and simulated for various scenarios in Japanese communities. The viability of implementing

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Georgiev, Milen Svetoslavov. "Optimizations of morphology, behaviour and evolution in multi-agent systems for predator-prey pursuit problem." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13155945/?lang=0, 2020. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13155945/?lang=0.

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The objective of this research improving the overall performance of MAS by minimizing the time needed to solve the predator-prey problem by evolutionary optimizing (coevolving) both the morphology and behaviour of agents, and minimizing the runtime needed by evolutionary framework – genetic programming to successfully accomplish such a coevolution. The experimental results obtained suggest that an asymmetric morphology of the very simple predator agents coevolved with their intricate “driving” behaviour results in a most efficient behaviour of the agents. 博士(工学) Doctor of Philosophy in E

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インダ, プラティヴィアウリア, and Aulia Indah Pratiwi. "Study on succinic acid extraction by liquid membranes and aqueous two-phase systems containing ionic liquids." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12902967/?lang=0, 2015. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12902967/?lang=0.

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近年発酵生産が注目されているコハク酸の抽出分離法についてイオン液体を含む液膜法及び水性２相抽出法を用いて研究した．イオン液体を含む含浸型液膜により，受容相に塩酸水溶液を用いることでコハク酸の上り坂輸送を達成できた．次にイオン液体を含む高分子溶媒膜によるコハク酸の透過を検討した．最適な条件は含浸液膜と異なり，透過にはコハク酸の各化学種が関与していた．最後に水溶性有機溶媒やイオン液体を用いた水性２相抽出法によるコハク酸の抽出を行った．塩および糖を相分離剤とすることで，発酵液で想定されるコハク酸の80％以上の抽出が達成できた． Succinic acid is widely used in many industrial sectors; pharmacy, textile, food, etc. The bio-production of succinic acid from renewable resource was desired because the petrochemical production of succinic acid became costly. In this study, the extraction and separation techniques of succinic acid by liquid membranes (LMs) and aq

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芳葳, 黄., and Fang Wei Huang. "Evolving social behavior of caribou agents in wolf-caribou predator-prey pursuit problem." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13106314/?lang=0, 2019. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13106314/?lang=0.

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We investigate an approach to apply Genetic Programming for the evolution of optimal escaping strategies of a team of caribou agents in the wolf-caribou predator prey problem (WCPPP) where the WCPPP is comprised of a team of caribou agents attempting to escape from a single yet superior (in terms of sensory abilities, raw speed, and maximum energy) wolf agent in a simulated twodimensional infinite toroidal world. We empirically verify our hypothesis that the incorporation of empathy in caribou agents significantly improves both the evolution efficiency of the escaping behavior and the effectiv

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浩輝, 遠藤, та Hiroaki Endo. "蓄電池併設型太陽光発電用パワーコンディショナを活用したエネルギーマネジメントシステムに関する研究". Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13127435/?lang=0, 2020. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13127435/?lang=0.

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本論文では，電力利用率向上と需給バランス調整に寄与する蓄電池付太陽光PCSの新たな制御法について検討を行い，その有効性を確認している。受電点の潮流に応じてPCSの力率を制御することで，逆潮流時には系統電圧の上昇を抑制しつつ，順潮流時には負荷への電力利用率を向上する手法を提案し，フィールド試験により有効性を定量評価した。また，受電電力の制御目標値を可変とする制御を用い目標値を最適化することで，新たな機器を付加する必要なく上げ下げのDRに対応し需給バランスを調整する制御手法を提案し，その有効性をシミュレーションおよび実機により検証した。 博士(工学) Doctor of Philosophy in Engineering 同志社大学 Doshisha University

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Chatzipanagiotou, Niki. "Advancing an Academic Library's services through application of Soft Systems Methodology." Thesis, Linnéuniversitetet, Institutionen för informatik (IK), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-36022.

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The Master thesis focuses on the application of Information Systems in the field of Library and Information Science. Within the context of organizational learning, a collaborative user-centered approach is used to produce desired system characteristics and future research suggestions. More specifically, this research study explores the library users’ and academic librarians’ perceptions of the current library discovery and access services as mediated through the Online Public Access Catalogue (OPAC) of the Academic Library of the School of Philosophy at Athens University in Greece. Additional

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Livres sur le sujet "OPAC systems"

Ayres, F. H. The Bradford OPAC 2: Managing and displaying retrievals from a distributed search in Z39.50. British Library Research and Innovation Centre, 1998.

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Virtanen, Seppo. Finlex-opas. Lakimiesliiton Kustannus, 1987.

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Commission, Wyoming Water Development. Opal regional system. Sunrise Engineering, 2001.

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Commission, Wyoming Water Development, and Sunrise Engineering Inc, eds. Opal regional system. Sunrise Engineering, 2000.

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Biddle & Associates. Career passport: The OPAC system test preparation manual. Prentice Hall, 1998.

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Damm, Matthias. OPC Unified Architecture. Springer-Verlag Berlin Heidelberg, 2009.

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Mark, Pejtersen Annelise, and Nordic Council of Ministers, eds. Subject access to Scandinavian fiction literature: Index methods and OPAC development. Nordic Council of Ministers, 1996.

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System, Alliance Library, Mid-Illinois Talking Book Center, Illinois State Library. Talking Book and Braille Service., Online Programming for All Libraries (Program), and TAP Information Services, eds. Online Programming for All Libraries: OPAL. TAP Information Services, 2004.

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Linda, Keenan, and Reagan Michael 1943-, eds. Search sheets for OPACs on the Internet: A selective guide to U.S. OPACs utilizing VT100 emulation. Meckler, 1991.

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1938-, Dillon Martin, and American Society for Information Science., eds. Interfaces for information retrieval and online systems: The state of the art. Greenwood Press, 1991.

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Chapitres de livres sur le sujet "OPAC systems"

Zhigeng, Wang. "Rebuilding the Library OPAC." In Web Information Systems – WISE 2006 Workshops. Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11906070_15.

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Mahnke, Wolfgang, and Stefan-Helmut Leitner. "System Architecture." In OPC Unified Architecture. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-68899-0_9.

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Maslova, Olga, Elena Efremenko, Tat'yana Mahlis, Ol'ga Sen'ko, Nikolay Stepanov, and Mariya Andriyanova. "Microbial biocatalysts in the biocatalytic processes of the degradation of organophosphorus compounds." In ORGANOPHOSPHORUS NEUROTOXINS. Publishing Center RIOR, 2020. http://dx.doi.org/10.29039/43_288-318.

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A number of single microorganisms and microbial consortia, carrying out the destruction of organophosphorus compounds (OPC) by using their own enzymatic systems, were identified and investigated. They can use OPC as a source of nutrients such as carbon and/or phosphorus. The rate of OPC decomposition varies and depends mainly on environmental conditions (pH, temperature, availability of oxigen, etc.) and composition of native microbial community. The development of genetically modified organisms capable of degrading OPC, the immobilization of cells and the creation of artificial consortia are

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Maslova, Olga, Elena Efremenko, Il'ya Lyagin, Ol'ga Sen'ko, and Aslanli Aslanli. "Immobilized enzymatic biocatalysts and their application for destruction of organophosphorus compounds in water, soil and air systems." In ORGANOPHOSPHORUS NEUROTOXINS. Publishing Center RIOR, 2020. http://dx.doi.org/10.29039/52_340-360.

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Undecomposed residues of organophosphorus compounds (OPC) after treatment with pesticides of plants or animals often fall into natural objects (water, soil and air). Modern approaches to the immobilization of enzymes allowing obtaining of stable biological products are described, as well as the possible using of immobilized enzymes for the decomposition of different OPC: paraoxone, methyl and ethyl paraoxone, coumaphos, parathion, methyl and ethyl parathion, chlorpyrifos, soman, VX, methylphosphonic acid and its isobutyl and diisobutyl ethers, diisopropyl fluorophosphate.

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Jia, Zhiping, and Xin Li. "OPC-based Architecture of Embedded Web Server." In Embedded Software and Systems. Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11535409_51.

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Gonçalves, Marcos André, Paul Mather, Jun Wang, et al. "Java MARIAN: From an OPAC to a Modern Digital Library System." In String Processing and Information Retrieval. Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-45735-6_18.

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Bernhard, Alexis T., Simon Jungbluth, Ali Karnoub, et al. "I4.0 Holonic Multi-agent Testbed Enabling Shared Production." In Artificial Intelligence in Manufacturing. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-46452-2_13.

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AbstractThis chapter aims at presenting the system architecture of a distributed production testbed embedded in an interoperable Shared Production network. The goal of the modular architecture is to enable flexible, resilient and distributed production. The presented approach illustrates how Multi-Agent Systems (MAS) can be incorporated in the manufacturing domain for distributed components on different hierarchy layers based on a holonic approach. The concept is validated on the real-world demonstrator testbed of the SmartFactoryKL. Furthermore, the MAS is combined with Industry 4.0 technolog

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Eremenko, Arkadiy, Il'ya Kurochkin, and Nataliya Nechaeva. "Bioanalytical systems based on cholinesterases for detection of organophosphates." In ORGANOPHOSPHORUS NEUROTOXINS. Publishing Center RIOR, 2020. http://dx.doi.org/10.29039/32_205-218.

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Various types of electrochemical sensors based on the inhibition of butyrylcholinesterase (BChE) have been presented for the analysis of organophosphates (OPC). A special design of thick film sensors and electrochemical detector for cholinesterases assay and their inhibitors in aqueous samples has been developed. For this assay, thiol sensitive sensors based on screen printed graphite electrode modified with nanoparticles of manganese dioxide were used. High sensitivity of manganese dioxide modified thick film sensors towards thiocholine and therefore low detection limit of BChE (1 pM) enabled

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Eremenko, Arkadiy, Il'ya Kurochkin, and Nataliya Nechaeva. "Bioanalytical systems based on cholinesterases for detection of organophosphates." In Organophosphorous Neurotoxins. Publishing Center RIOR, 2020. http://dx.doi.org/10.29039/chapter_5e4132b6096d14.18045940.

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Wágner, Tamás, Tamás Tettamanti, Balázs Varga, and István Varga. "PLC-Based Traffic Light Control for Flexible Testing of Automated Mobility." In Lecture Notes in Networks and Systems. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-4581-4_13.

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AbstractRoad infrastructure has evolved to meet diverse needs over time. This makes modernizing traffic control systems also necessary in order to keep pace with technological innovations and changing user habits. This paper presents a novel design and implementation strategy for the next generation of traffic control systems, with particular emphasis on the challenges posed by the integration of automated vehicles. General flexibility in future traffic management, proper use of standardized communication protocols, and safety solutions are essential factors in addressing the traffic challenge

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Actes de conférences sur le sujet "OPAC systems"

Li, Yingzhi, Baisong Chen, Xuetong Li, et al. "Silicon-based Optical Phased Array Enabled Non-Line-of-Sight Optical Wireless Communication." In Optical Fiber Communication Conference. Optica Publishing Group, 2025. https://doi.org/10.1364/ofc.2025.th3j.4.

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We propose and demonstrate an optical wireless communication (OWC) system with the silicon-based optical phased arrays (OPAs) transceiver. The system achieved full-duplex data transmission covering 120° steering range and 220-Gbps non-line-of-sight signal transmission.

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Chen, Baisong, Yingzhi Li, Quanxin Na, et al. "Demonstrated High-Frame-Rate Real-Time 4D Imaging of Optical Phased Array Solid-State LiDAR System." In Optical Fiber Communication Conference. Optica Publishing Group, 2025. https://doi.org/10.1364/ofc.2025.m2j.1.

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We present a silicon-based OPA all-solid-state LiDAR system that achieves real-time 4D imaging. The system achieved a 40 kHz LiDAR point frequency and demonstrated real-time 4D imaging up to 30 frames per second.

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Roy, Saumya Vilas, and B. S. Manoj. "A Complex Network Analysis of the OPEC Crude Oil Trade Network." In 2024 IEEE Recent Advances in Intelligent Computational Systems (RAICS). IEEE, 2024. http://dx.doi.org/10.1109/raics61201.2024.10689836.

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Bromage, Jake, Seung-Whan Bahk, Matthew Barczys, et al. "Laser system design and critical technologies for the NSF OPAL project." In High-power, High-energy Lasers and Ultrafast Optical Technologies II, edited by Pavel Bakule, Patrick Baer, Joachim Hein, and Thomas J. Butcher. SPIE, 2025. https://doi.org/10.1117/12.3055413.

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Zainal, Haliza Binti, Ab Razak Bin Che Hussin, and Nor Fadzleen Binti Sa'don. "Web OPAC end user satisfaction from Library Science and Information System Perspectives." In 2013 International Conference on Research and Innovation in Information Systems (ICRIIS). IEEE, 2013. http://dx.doi.org/10.1109/icriis.2013.6716758.

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Towrie, M., P. Matousek, A. W. Parker, F. P. Taday, and W. T. Toner. "Two 40 Khz Repetition Rate Independently Tunable, Synchronised Femtosecond Pulses Generated In The Visible Using Optical Parametric Amplifiers." In The European Conference on Lasers and Electro-Optics. Optica Publishing Group, 1996. http://dx.doi.org/10.1364/cleo_europe.1996.ctuo6.

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Many time-resolved spectroscopy techniques require two broadly and independently tunable, synchronised light pulses. Recent advances in short pulse laser technology and non-linear crystal materials have lead to rapid development of optical parametric oscillators (OPOs) and travelling wave optical parametric amplifiers (OPAs) capable of meeting these requirements. Our aim was to develop a multi-kilohertz repetition rate OPA system for femtosecond/picosecond, pump and probe time-resolved absorption and resonance Raman spectroscopies. We believe this work reports, for the first time, on synchrono

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Kafka, J. D., and M. L. Watts. "A Potassium Niobate OPA Pumped by an Amplified Ti:sapphire Laser." In International Conference on Ultrafast Phenomena. Optica Publishing Group, 1996. http://dx.doi.org/10.1364/up.1996.tue.6.

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Optical parametric amplifiers (OPAs) have been used to extend the wavelength range available from amplified Ti:sapphire lasers [1,2]. These systems typically produce 100 fsec pulses throughout the visible and near infrared. Recently, there has been much interest in generating wavelengths beyond 3 μm, often by means of difference frequency mixing [3]. Direct generation of pulses from an OPA however, offers the potential for higher energy. We report, for the first time, generation of 3 to 5 μm pulses directly from a potassium niobate (KNbO3) OPA pumped by an amplified Ti:sapphire laser [4].

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Matousek, P., A. W. Parker, P. F. Taday, W. T. Toner, and M. Towrie. "Doubly Tunable Femtosecond Pulses Generated in the Visible using Optical Parametric Amplifiers for Time-resolved Spectroscopy." In Laser Applications to Chemical and Environmental Analysis. Optica Publishing Group, 1996. http://dx.doi.org/10.1364/lacea.1996.lwd.3.

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Many time-resolved spectroscopy techniques require two broadly and independently tunable, synchronised light pulses. This requirement can be met by optical parametric oscillators (OPOs) [1] and travelling wave optical parametric amplifiers (OPAs) [2, 3, 4, 5]. The latter capable of providing higher pulse energies. Our aim was to develop a multikilohertz repetition rate OPA system capable of providing femtosecond/picosecond, synchronised and independently tunable pump and probe pulses in the visible part of the spectrum for time-resolved absorption and resonance Raman spectroscopies.

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Zhou, Xia, Jiaqi Li, Wenlong Zhang, Yajin Zhou, Wenbo Shen, and Kui Ren. "OPEC." In EuroSys '22: Seventeenth European Conference on Computer Systems. ACM, 2022. http://dx.doi.org/10.1145/3492321.3519573.

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Grudinkin, S. A., S. F. Kaplan, N. F. Kartenko, D. A. Kurdyukov, and V. G. Golubev. "Photonic crystal properties of opal-hematite and opal-magnetite films." In Photonics, Devices, and Systems IV, edited by Pavel Tománek, Dagmar Senderáková, and Miroslav Hrabovský. SPIE, 2008. http://dx.doi.org/10.1117/12.818010.

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Rapports d'organisations sur le sujet "OPAC systems"

Kaewplung, Pasu. Performance improvement of long-haul ultra-high-speed optical transmission using midwary optical phase conjugation. Chulalongkorn University, 2003. https://doi.org/10.58837/chula.res.2003.58.

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In optical phase conjugation (OPC) systems, the third-order dispersion (TOD) of optical fibers and the nonlinear resonance at well-defined signal sideband frequencies called sideband instability (SI) mainly limit the transmission performance. We present for the first time a complete theoretical analysis of sideband instability (SI) that occurs when two kinds of fibers with different characteristics are concatenated to form a dispersion-managed fiber link. We find that the magnitude of the SI gain reduces with the increase in strength of dispersion management. Next, we focus on the fiber link u

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Armas, Elvira, and Magaly Lavadenz. The Observation Protocol for Academic Literacies (OPAL); A Tool for Supporting Teachers of English Language Learners. CEEL, 2011. http://dx.doi.org/10.15365/ceel.article.2011.1.

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Schools and school systems are experiencing an instructional support gap that results in limited opportunities for educators to analyze, reflect on and improve research-based practices for ELLs so that outcomes for culturally and linguistically diverse students can change. To address this need, an inter-disciplinary research team from the Center for Equity for English Learners, comprised of educational leaders, teachers, researchers, and content experts developed a classroom observational instrument—the Observation Protocol for Academic Literacies (OPAL). The OPAL is intended for teachers, edu

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Kommareddy, Vamsee, Clayton Hughes, Simon David Hammond, and Amro Awad. Opal: A Centralized Memory Manager for Investigating Disaggregated Memory Systems. Office of Scientific and Technical Information (OSTI), 2018. http://dx.doi.org/10.2172/1467164.

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Khalil, James, MaryAnne Iwara, and Martine Zeuthen. Journeys through Extremism: The Experiences of Forced Recruits in Boko Haram. RESOLVE Network, 2022. http://dx.doi.org/10.37805/cbags2022.2.

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This case study provides exploratory research into the personal journeys of forced recruits into Boko Haram, to examine how they entered the organization, the conditions they experienced in camps and settlements, their exits from the group, their subsequent experiences in state hands, and their perspectives about future reintegration. These themes are particularly pertinent given the mass disengagements from Boko Haram in spring 2022, and the extent to which federal and state systems lack the capacity to absorb and handle the large numbers involved. Research was undertaken at Operation Safe Co

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Trowbridge, Christian A. The PL/OPA Multichannel Transmissometer Control and Data Acquisition System. Defense Technical Information Center, 1990. http://dx.doi.org/10.21236/ada237842.

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Cui, Jin. Study on OPAL-RT Simulation System Hardware in Loop and Simulation on Microgrid Black Start. Iowa State University, 2018. http://dx.doi.org/10.31274/cc-20240624-1349.

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Kaewplung, Pasu. Performance improvement of fiber-optic transmission system by replacing electronic repeaters with optical amplifiers. Chulalongkorn University, 2004. https://doi.org/10.58837/chula.res.2004.70.

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We study four methods: the zero-dispersion wavelength (ZDWL) transmission, the dispersion management, the optical soliton transmission, and the midway optical phase conjugation (OPC), for upgrading installed electronic repeater-based optical fiber transmission system to optically amplified system. We derive the optimum design rules for each scheme to achieve the maximum transmission data rate. The 1,318-km-long Thailand-Malaysia (T-M) submarine fiber-optic transmission system is used as the system model. Firstly, we give the basic knowledge about fiber characteristics and their effects to sign

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Mata, João Trocado da, José Soares Neves, Patrícia Àvila, and Miguel Ângelo Lopes. Práticas de leitura dos alunos dos ensinos básico e secundário – Barómetro’23. Observatório Português das Atividades Culturais, CIES-Iscte, 2025. https://doi.org/10.15847/ciesopacleiturabarometro23.

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The National Reading Plan (PNL2027) commissioned the Portuguese Observatory for Cultural Activities (OPAC) to carry out a study on the Evolution of Reading Practices among Primary and Secondary School Students. The study was carried out in partnership with the Directorate-General for Education and Science Statistics (DGEEC) and the School Libraries Network (RBE). With this operation, the construction of a system for the regular collection of information on the evolution of the reading practices of students in non-tertiary education began, responding to a need that had long been diagnosed by th

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EER SYSTEMS CORP VIENNA VA. C4RDP Support System (S2) Version 2.0 Needline Primary/Secondary Means of Transmission and Automation Equipment Supported by OPFAC Rules Module. Defense Technical Information Center, 1993. http://dx.doi.org/10.21236/ada268441.

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Frank, Matthias, David N. Fittinghoff, Dan E. Bower, et al. Line-of-sight measurements for the NIF Neutron Imaging System and determination of line-of-sight offsets in OPAS 90-135 images. Office of Scientific and Technical Information (OSTI), 2011. http://dx.doi.org/10.2172/1113514.

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