1,722,001 research outputs found
Is sustainable energy development ensured in the EU agriculture? Structural shifts and the energy-related greenhouse gas emission intensity
No full textThe changes in energy use and energy-mix are important in ensuring the implementation of the sustainability goals, especially those related to the climate change. Even though there have been attempts to analyse the energy-related greenhouse gas (GHG) emission in the European Union, there is still a lack of research that considers structural change, fossil energy consumption, and energy-mix simultaneously. In this context, the present paper addresses the growth in energy-related greenhouse gas (GHG) emissions in the European Union (EU) agriculture. The index decomposition analysis based on the logarithmic mean Divisia index is implemented over the period of 2004–2021. The change in the GHG intensity at the EU level is factorized with respect to the structural effect and those related to the energy intensity, the share of the fossil energy, and carbon factor for the fossil energy. The results suggest that a decline in the energy intensity appeared as the main driver pushing the energy-related GHG emission intensity down in the EU agriculture. This calls for further actions directed towards the increase of the use of renewables
Time-domain oversampled OFDM communication in doubly-selective underwater acoustic channels
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Assessment of SYMS Survival Limit for “Peng Bo” FPSO During Installation
No full textThe ConocoPhillips “Peng Bo” FPSO in Bohai Bay, China, is one of the largest FPSOs in the world. It was installed in early 2009 and first oil was achieved in May 2009. The FPSO is moored to a jacket platform in about 27m water depth via a Soft Yoke Mooring System (SYMS). The mooring system consists of two yoke arms (port and starboard) connected at the jacket end to a turn-table that sits on a main bearing at the top of the jacket. The other ends of the yoke arms are integrated with two large ballast tanks which are attached to two pendulums supported by a rigid frame mounted on the forward end of the FPSO. The ballast weights give rise to the necessary system surge restoring force while the turntable and bearing allow the FPSO to weathervane. The yoke arms and ballast tanks are pre-installed with empty ballast tanks mounted on two temporary support barges while awaiting the arrival of the FPSO. Upon arrival, the ballast tanks are attached to the pendulums from the FPSO side. The tanks are then filled with solid concrete ballast to achieve the design weight. Before the tanks are completely filled, the SYMS may not have sufficient restoring force in partially filled condition to prevent excessive pitching of the yoke arms and severe bearing load on the jacket beyond the design limit due to large FPSO offset in the event of an unforeseen storm event. An analysis was carried out to estimate the maximum bearing load and yoke arm pitch angle when the ballast tanks were 0%, 25%, 50%, and 75% full for 10-year and 100-year return period events. This paper describes the analysis methodology and results from the analysis. The overall project and installation experience are also discussed.</jats:p
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
A study on physical oceanographic parameters for the OTEC in NW Pacific
No full text海洋蘊藏多樣能源，主要的再生能源有海洋溫差能、波浪能、潮汐能、海流能等，且乾淨無汙染，富有開發價值。其中以海洋溫差能有最大的開發價值，若能對臨近台灣的熱帶海域，採用浮動式OTEC來開發海洋溫差能源，對台灣將來的能源發展有很大的幫助。 本研究將以海洋溫差發電(OTEC)所需環境，以經度130°E~150°E、緯度0°N~20°N區域來做為海洋溫差發電的評估區域。評估的項目有海洋表面溫度、海面平均風速U10、有義波高、表面流速及颱風各回歸周期波高等，分5°x5°來討論，以決定那一區域在各方面的評估總體最佳。 評估的結果以緯度0°N~5°N，經度130°E~135°E，在此區域的颱風強度及出現頻率，海面平均風速、有義波高均最小，所以緯度0°N~5°N，經度130°E~135°E最適合發展OTEC。但此處有眾多小島，可能要跟他國簽訂合作計畫。Ocean embraces tremendously abundant resources of ocean thermal energy, wave energy, tidal energy, and ocean current energy…etc. They are clean , create no pollution, and possess immense potential for development. Among which, ocean thermal energy holds the most formidable capacity – if the Ocean Thermal Energy Conversion (OTEC) system is adopted properly at tropical oceans near Taiwan. Taiwan’s energy production will thus be benefited. This research studies the oceanographic parameters for developing the OTEC in the region between latitude 0°N-20°N and longitude 130°E-150°E. The parameters include surface temperature, average wind speed at surface, significant wave height, surface flow speed, and typhoon wave height…etc. The area concerned is divided into a 5 degree latitude by 5 degree longitude grid to help identify the best spot to develop the OTEC system. As a result, the grid of latitude 0°N-5°N and longitude 130°E-135°E proves to be the most ideal, since it show the least typhoon intensity, occurrence frequency, average wind speed at surface, and significant wave height. Implementation of the OTEC system requires international collaboration since there are many small islands scattering in this area.誌謝………………………………………………………………………………….... i文摘要………………………………………………………………………………iibstract……………………………………………………………………………….iii文目錄…………...…………………………………………………………………iv目錄………………………………………………………………………………...vi目錄……….……….………….……………………………………………………ix號說明………………………………………………………………………………x一章 序論 1-1 研究背景…………………………………………………………………...1 1-2 海洋溫差發電(OTEC)的簡介…………………………………………….2 1-3 海洋熱能資源及其效率…………………………………………………...3 1-4 OTEC的歷史………………………………………………………………3 1-5 固定式及浮動式OTEC……………………………………………………5 1-6 浮動式OTEC的運轉環境………………………………………………...6 1-7 研究方法與目的…………………………………………………………...7二章 研究區域及使用資料介紹-1 研究區域…………………………………………………………………...8-2 使用資料…………………………………………………………………...8-2.1 JTWC颱風資料……………………………………………………….8 2-2.2 TMI衛星資料…………….………….………………………………..9-2.3 QuikSCAT資料……………………………………………………….9-2.4 Jasion-1資料…………………………………………………………10-2.5 OSCAR表面流速資料………………………………………………10三章 颱風資料分析與極端值理論 3-1 颱風資料……………………………………………………………….. ..11 3-2 頻率分析………………………………………………………………….11 3-2.1 概述…………………………………………………………………..12 3-2.2 頻率分析之程序……………………………………………………..12 3-2.3 頻率分布之模式……………………………………………………..13 3-3 JTWC風速資料處理……………………………………………………..15 3-4 颱風風速跟波高的關係………………………………………………….16四章 結果與討論 4-1 颱風極端值分析結果…………………………………………………….18 4-1.1 緯度5°N-10°N區域………………………………………………….18 4-1.2 緯度10°N-15°N區域…………………………………………………19 4-1.3 緯度15°N-20°N區域…………………………………………………19 4-1.4 颱風影響結論………………………………………………………..20 4-2 表面海水溫度SST……………………………………………………….21 4-3 非颱風時的有義波高…………………………………………………….21 4-4 表面風速………………………………………………………………….22 4-5 表面流速………………………………………………………………….23五章 結論與建議……………………………………………………………...-24-考文獻……………………………………………………………………………..2
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