1,720,973 research outputs found
Skyline tension and dynamic loading for cable yarding comparing conventional single-hitch versus horizontal double-hitch suspension carriages
Full text linkWire rope used in cable logging, where a series of cables facilitate the extraction of timber on steep terrain, experiences high tensions that must be managed to ensure safety. Innovations change practices over time and double-hitch carriages, which allow trees to be extracted horizontally, are a recent example. This makes it feasible to harvest across terrain with limited deflection, increases the recovery of biomass, and potentially reduces high-dynamic load events associated with ground contact. In this study, a standard single-hitch carriage was compared against a new double-hitch carriage under controlled conditions. Tension was measured continuously and specific elements, such as tension when the carriage was at midspan, maximum tension at breakout and inhaul, and magnitude of cyclic tension during inhaul were identified, measured and compared against payload. While payload was similar in the treatments, the additional weight of the double-hitch carriage resulted in higher skyline tensions. In both treatments, payload and skyline tension when the carriage was at midspan were strongly correlated. Cyclic tension was reduced by the double-hitch carriage system. While a number of unique high-dynamic loads were identified that were not part of the normal extraction, they represented only 6% of the cycles and the maximum tension was similar to that experienced during break-out and inhaul. This study increased the understanding of skyline tension during logging operations and the effect of carriage type. It showed that, though tension often exceeds the safe working load of the cable, it does not exceed the endurance limit for a well-designed and operated system
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
Freilufttrocknung von Energieholz in Rundholzpoltern
No full textMoisture content influences the calorific value of fuel wood and is classified as an important quality criterion. This paper discusses modelling moisture content in fuel wood windrows. For this purpose, a windrow of pine stems (Pinus sylvestris) in a frame, based on load sensors, was erected. Next to the frame, a meteorological station was set up. Relative humidity, wind speed, temperature, rainfall and total pile mass were recorded every ten minutes. The investigation period covers December 2009 to February 2011. Statistical analysis was carried out by multiple linear regression models. Equations were found to predict moisture content, based on daily averages up to 0.53% average deviation over 14 months. Moisture content in the pile decreased from December 2009 until February 2011 from 50.09% to 32.15%. From May to June, drying rates up to 4.5% were observed. In autumn moisture content increased by 1.6%. Dry matter loses ranged around 5% in the investigation period. Further the effect of heavy rainfall on the moisture content was investigated. Heavy rainfall events can cause a rise in moisture content and a slowdown in drying for several days. A cost-benefit-analysis showed that drying allowed an interest rate of 60% in comparison with 2% without.Der Wassergehalt von Energieholz beeinflusst den Heizwert und gilt als wichtiges Qualitätskriterium beim Verkauf. Ziel dieser Arbeit ist es Modelle zu entwickeln, die den Wassergehalt eines Energie- rundholzpolters bei Freilufttrocknung über einen längeren vorhersagen können. Dazu wurde ein auf Wiegezellen gelagerter Polter mit Kiefernholz (Pinus sylvestris) über knapp 14 Monate beobachtet. Eine automatische Wetterstation zeichnete im 10 Minuten-Intervall die Gewichts- und Wetterdaten auf. Die statistische Analyse wurde auf Basis von multiplen linearen Regressionen durchgeführt. Dabei konnten Funktionen gefunden werden, die es ermöglichen den Wassergehalt auf Basis von Tagesmittelwerte im Mittel auf bis zu 0,53% genau über knapp 14 Monate vorherzusagen. Der Wassergehalt des Polters sank von Dezember 2009 bis Februar 2011 von 50,09% auf 32,15%. Dabei konnten von Mai bis Juli monatliche Trockenraten von bis zu 4,5% erreicht werden. Im Herbst nahm der Wassergehalt wieder um etwa 1,6% zu. Der Trockenmassenverlust lag bei etwa 5% im gesamten Versuchszeitraum. Weiters wurde untersucht wie sich Starkregenereignisse auf den Wassergehalt eines Polters auswirken. Es zeigte sich, dass intensive Niederschlags-ereignisse die Trocknung mehrere Tage lang bremsen können. Eine Kosten-Nutzen-Rechnung ergab eine 60%tige Verzinsung des eingesetzten Kapitals durch die Trocknung. Ohne die Trocknung wären lediglich 2% erzielt worden.erstellt von: Gernot ErberWien, Univ. für Bodenkultur, Dipl.-Arb., 2011Zsfassung in engl. Sprach
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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