1,720,981 research outputs found
The Selection of the Best Solar Panel for the Photovoltaic System Design by Using AHP
No full textAbstractThere has been numerous efforts by researchers worldwide cooperating to reduce the material costs of photovoltaic panels, efficient novel products and improve their energy efficiency and procreate innovative and practices based on photovoltaic system design technology. The aim of this paper is to select the best solar panel for the photovoltaic system design by using AHP (Analytical Hierarchy Process) from the multi-criteria decision making methods. Among 200W solar panel brands, the problem of selecting the best solar panel is evaluated, using fifteen electrical, three mechanicals, three economic, three customers and two environment related criteria. Used data is obtained from the solar panel companies worldwide
Going 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
Improving Resilience through Flexibility: Strategies to Long-life Quality Housing
No full textThis work intends to analyze the flexibility to improve the adaptability to the users and to define some strategies to delay building obsolescence. If flexibility is defined as the ability of a system to be easily modified and to respond to user needs in a timely and effective manner, then it can be considered an antidote to obsolescence and a characteristic of the system that ensures the extension of its life cycle over time. The research proposes the project strategies aimed at ensuring the survival over time of the building, thanks to the ability to implement several cycles of use of the building, confront the ability to reconfigure the internal structure and intervene in a simplified way on the technological system that governs the space
Evaluation of Vegetable Oil-Sourced Lubricants for Transition to Green Alternative at Sustainable Energy Solutions for Automotive Industry
Full text linkIn recent decades, the rising energy needs has concluded in much more lubricant usage. Lubricants play a significant part in decreasing the friction and wear among bustling superficies. They are among the greatest drivers of oil need. The ecological affects arising from the direct petroleum-based lubricants’ entry requires the implementation of bio-sourced lubricants as a perfect option to petroleum-derived lubricants. The bio-sourced lubricants’ primary resources are oils derived from plants. There are numerous compatibilities between petroleum-based lubricants and triglycerides from the view point of physical and chemical features. Because of their non-food competition, less expense, and simple usability, vegetable-sourced oils are a potential option to fossil-sourced lubricants for the fabrication of wide-ranging sector implementations. Thus, the implementation of nonedible oils as a maintainable biobased lubricant source plays an important part in lubricant sectors. In this study, the physicochemical features, molecular structures, and other important lubrication efficiency parameters were researched which is necessary for vegetable oil-sourced lubricant choice. Within the industry standards, this study aims to found the most appropriate vegetable-sourced lubricant base on diverse characteristics present. A table of characteristics is evaluated. Finally, the criterion weighting methodology implemented to the emerging scheme. The implementation of the results from this study provides an opinion of how the criterion weighting modeling can be applied in vegetable oil-sourced lubricants
ENVIRONMENTAL CHIMNEY DESIGN TO REDUCE EMISSIONS; CASE STUDY ON BULANIK DISTRICT
No full textBinalar tükettikleri enerji oranı düşünüldüğünde yüksek oranda çevresel kirliliğe sebep olan yapılardır. Özellikle küçük veya büyük sanayi işletmeleri olarak tasarlanan binalardan doğaya salınan emisyonlar düşünüldüğünde atmosferi ciddi ölçüde kirletici etkiye sahiplerdir. Binalarda ısıtma amaçlı kullanılan kazanlar, yakıtta bulunan kimyasal enerjiyi yanma etkisiyle ısı enerjisine dönüştüren sistemlerdir. Isı enerjisinin taşıyıcı akışkana iletilmesi amacıyla belli basınçlarda çalışabilen kapalı sistemler olarak çalışırlar. Kazan sistemleri ile emisyonların atmosfere taşınmasını sağlayan baca sistemi arasındaki performans parametreleri dikkate alınarak yapılan optimum baca tasarımı yanmanın sonucu ortaya çıkan emisyon miktarını direk etkilemektedir. Bu çalışmada, 175 000 kcal/h kapasitesinde doğal gaz ile çalışan bir ısıtma kazanına sahip küçük bir şekerleme atölyesi Muş iline bağlı Bulanık ilçesinde bölgenin iklim şartlarına göre tasarlamıştır. Atölye bünyesindeki kazan sistemine ait bacanın paslanmaz çelik olması durumunda formları oval ve dairesel olarak belirlenmiştir. Tasarlanan baca sisteminde dirsek sayısının değişmesi (1 dirsekli, 2 dirsekli, 3 dirsekli) durumunda çevre kirliliğine olan etkileri baca performans parametreleri (baca ağzı kesiti, baca akım hızı, baca atık gaz yoğunluğu, baca akım sesi, -15ºC rüzgar hızı karşılaştırması, +15ºC rüzgar hızı karşılaştırması, bacadaki durgun basınç, atık gaz hızı, azami negatif basınç, atık gaz sıcaklığı, bina içi ve bina dışı bacanın iç cidar sıcaklıkları, baca malzemesi sıcaklığı, baca havasının doğru akım sıcaklığı, baca yanak (R12) sıcaklığı karşılaştırması) ile birlikte araştırılmıştır. Çevre kirliliğine etki eden baca gazı değerlerinin belirlenmesi amacıyla KesaAladin simülasyon programı kullanılmıştır. Muş iline bağlı Bulanık ilçesi için araştırılan tasarım parametreleri hep birlikte değerlendirilerek minimum çevre kirliliği açısından ilçeye en uygun tasarım belirlenmiştir. Çalışma sonuçlarının ilçedeki çevre yönetimi ile ilgili karar vericilere ve baca tasarımcılarına, rehberlik etmesi amaçlanmıştır.Considering the energy consumption of buildings, they are structures that cause high levels of environmental pollution. Especially considering the emissions released into nature from buildings designed as small or large industrial enterprises, they have a serious polluting effect on the atmosphere. Boilers used for heating purposes in buildings are systems that convert the chemical energy in the fuel into heat energy through combustion. They operate as closed systems that can operate at certain pressures in order to transmit heat energy to the carrier fluid. The optimum chimney design, which is made by considering the performance parameters between the boiler systems and the chimney system that allows the emissions to be carried to the atmosphere, directly affects the amount of emissions resulting from combustion. In this study, a small confectionery workshop with a natural gas-powered heating boiler of 175,000 kcal/h capacity was designed in Bulanık district of Muş province according to the climatic conditions of the region. In case the chimney of the boiler system in the workshop is made of stainless steel, its forms were determined as oval and circular. In case of changing the number of elbows in the designed chimney system (1 elbow, 2 elbows, 3 elbows), the effects on environmental pollution were investigated together with the chimney performance parameters (chimney mouth section, chimney flow velocity, chimney exhaust gas density, chimney flow sound, -15ºC wind speed comparison, +15ºC wind speed comparison, stagnant pressure in the chimney, exhaust gas velocity, maximum negative pressure, exhaust gas temperature, internal wall temperatures of the chimney inside and outside the building, chimney material temperature, direct current temperature of chimney air, chimney sidewall (R12) temperature comparison). KesaAladin simulation program was used to determine the flue gas values ??affecting environmental pollution. The design parameters investigated for the Bulanık district of Muş province were evaluated together and the most suitable design for the district in terms of minimum environmental pollution was determined. The study results are intended to guide decision makers and chimney designers regarding environmental management in the district
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
Evaluation of wind energy potential and electricity generation at six locations in Turkey
No full textIn this study, wind characteristics were analyzed using the wind speed data collected of the six meteorological stations in Turkey during the period 2000-2006. The annual mean wind speed of the six stations (Erzurum, ElazIg, Bingöl, Kars, Manisa and Nigde) is obtained as 8.7, 8.5, 5.9, 6.9, 7.4 and 8.0Â m/s at 10Â m height, respectively. The mean annual value of Weibull shape parameter k is between 1.71 and 1.96 while the annual value of scale parameter c is between 6.81 and 9.71Â m/s. A technical assessment has been made of electricity generation from four wind turbines having capacity of (600Â kW, 1000Â kW, 1500Â kW and 2000Â kW). The yearly energy output and capacity factor for the four different turbines were calculated.Wind energy Weibull distribution Wind turbine
- …
