1,721,726 research outputs found
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
Statistical characterization of sedimentation velocity of natural particles
Full text linkAeolian sediment transport has major repercussions for global climatic variations, air quality, human health, agricultural areas, air and ground transportation, civil structures and infrastructures. This led to the development of models to understand the involved physical process, and to predict the dynamics of aeolian sediment transport. The sedimentation velocity is one of the key model parameters characterizing sediment behavior. It allows the prediction of the mode of transport, the distribution of particles above the ground, and the sediment transport rate. Despite its importance, there is substantial discrepancy among the sedimentation velocity laws for natural particles, also due to the large dispersion of experimental data. This study proposes the statistical characterization of the experimental measurements of sedimentation velocity available from the literature. 1812 experimental measurements were recovered from 11 studies. Their variability was discussed, providing an aerodynamic reading. Nonlinear regression was carried out on the consolidated dataset in order to assess the average value. Two well-known laws initially conceived for spheres were refitted to natural particles providing high coefficients of determination equal to 0.90 and 0.93. Then, copula-based regression was performed in order to seize the variability of sedimentation velocity. Finally, the results from the two approaches were compared and critically discussed
Letter from Sherman D. Thacher to John Muir, 1910 Oct 13.
Full text linkTHE THACHER SCHOOLSHERMAN DAY THACHERWILLIAM LARNED THACHER}ASSOCIATE HEADMASTERSAT CASA DE PIEDRA RANCH IN THE OJAI VALLEYVENTURA COUNTY, CALIFORNIANORDHOFF, CALIFORNIA,October 13,1910My dear Mr; Muir:This is just to remind you that some day we hope you are going to make us a visit. We will give you a comfortable room where you can write and work as you please, an easy horse to ride, and nothing to do that you do not wish to. I long to have you here so that my boys can hear you talk about the flowers, and the birds, and the mountains;as you walk ellizabel about with them. It is very easy to get here now from Los Angeles, or from the North, if you stop Off at Ventura and change cars. Let me Know by letter, telephone, or telephone at any time, and we will meet you.I was very sorry indeed to hear of the death of yoursister.Believe me, with kindest regards and many delight-ful memories of our summer in the Tuolumne Meadows,Yours very sincerely,To:Mr. John Muir,Martinez, Cal.04887https://scholarlycommons.pacific.edu/jmcl/31862/thumbnail.jp
Letter from Sherman D. Thacher to John Muir, 1909 May 7.
Full text linkMuir-2My brother-in-law, William Kent, has three of his boys here, and the enclosed reply which I received the other day, indicates that one of my friends agrees with me that you ought to be with us!Do not wait for John Burroughs, but come at once if you find that you can.Believe me,Yours very sincerely,[illegible]Mr. John Muir,Martinez, Cal.04491https://scholarlycommons.pacific.edu/jmcl/31431/thumbnail.jp
Letter from Sherman D. Thacher to John Muir, 1910 Dec 14.
Full text linkTHE THACHER SCHOOLAT CASA DE PIEDEA RANCHIN THE OJAI VALLEYVENTURA COUNTY, CALIFORNIA[illegible]SHERMAN DAY THACHERWILLIAM LARNED THACHERASSOCIATE HEADMASTERSNORDHOFF, CALIFORNIA, December 14, 1910.My dear Mr. Muir:A small group of our boys are thinking of going to the Yosemite in the Christmas vacation. It occurs to me, naturally how delightful it would be to have you with us for a few days at least before the boys start, to teach them a little of the way to love your beloved Yosemite. You need not think we shall make you make a speech, but we should simply set about, and walk about, with you, and hear you talk in the way that I know the pleasure of so well.Please do not think me importunate. I only write because I know that some day it may happen to be entirely convenient and agreeable for you to run up here. If you take the eight o\u27clock a.m. train or the 2:30 p.m. train, you connect with the Ojai train very conveniently, or I will meet you in Ventura by automobile. You can talk with me directly by Sunset telephone any morning between 8:15 and 10:,-- and often at other times. Do not bother to reply to this unless you happen to feel like falling in with my suggestion.Yours most sincerely,[illegible]To:Mr. John Muir,Care Mr. J. D. Hooker,West Adams Street, Los Angeles.04913https://scholarlycommons.pacific.edu/jmcl/32022/thumbnail.jp
Letter from Sherman D. Thacher to John Muir, 1910 Mar 7.
Full text linkTHE THACHER SCHOOLAT CASA DE PIEDRA RANCHIN THE OJAI VALLEYVENTURA COUNTY, CALIFORNIASHERMAN DAY THACHERWILLIAM LARNED THACHER }ASSOCIATES HEADMASTERSNORDHOFF,CALIFORNIA,...March 7, 1910.My dear Mr. Muir:Won1! you come down and make us a little visit? I am not going to ask you to deliver an address because I know you do not like to, but it would be the best thing in the world for my boys to have a chance to get acquainted with you. And I should like to show you some of the charms of this beautiful little valley. A party of about Four or five is thinking of going to the Yosemite the last week in March. Would they enjoy it at that time, or would they be unable to ride the trails, and find it slushy everywhere under foot. I wish you could come to us sometime within the next two weeks, but before March 21st, as the boys begin to scatter for the Easter vacation on that date. If you cannot come now, I wish you could come sometime in May. Or, if you could be here for our closing exercises, June 10th to 15th, it would be delightful.You know this is an out of door school, in the mountains, and I think as the Archbishop of the California uplands, it is your duty to pay us a parochial visit! Your Grand Canyon friend, Miss Breck, is in the valley just now, and I know would add her petition to mine. It would do us all good to see you.04724https://scholarlycommons.pacific.edu/jmcl/31943/thumbnail.jp
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
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