117,421 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
Letter from unknown writer to Jesse L. Boyce
No full textLetter to Jesse L. Boyce from unknown author (possibly Jack) about the investigation into the powder magazine located in the Grand Canyon. Some personal news is included in the letter such as the writer's marriage to the daughter of C.A. Taylor, former Supervisor of Cochise County
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Sarah L. Blum Author Visit - Warrior Nurse: PTSD and Healing
No full textHear Sarah L. Blum, author of Women Under Fire: Abuse in the Military, discuss her newest book, Warrior Nurse: PTSD and Healing followed by a Q&A and book signing.
Sarah L. Blum is a decorated Vietnam veteran who served as an operating room nurse during the intense fighting of 1967. In recognition of her service, she was awarded the Army Commendation Medal.
Sponsored by CWU Veterans Center and CWU Libraries.https://digitalcommons.cwu.edu/libraryevents/1252/thumbnail.jp
Lillian L. Lambert, Author, Speaker, and Entrepreneur
No full textLillian L. Lambert, Author, Speaker, and Entrepreneu
ONTOGENETIC AND VITALITY STRUCTURES OF THE ACER CAMPESTRE L. AND A. TATARICUM L. RAVINE FOREST COENOPOPULATIONS IN CONDITIONS OF RECREATIONAL LOAD
No full textПроаналізовано результати досліджень основних показників життєвості і продуктивності ценопопуляцій Acer campestre L. і A. tataricum L. у двох байрачних лісах порожистої частини Дніпра за умов рекреаційного навантаження. Досліджувані ценопопуляції в обох балках повночленні, нормальні, такі, що не втратили здатності до відновлення та самопідтримання. Разом із тим, отримані розмірні спектри характеризують ценопопуляції A. campestre L. і A. tataricum L. як зрілі, спостережено старіння їх генеративних особин. На відміну від A. campestre, ценопопуляції A. tataricum L. мають високий відновлювальний потенціал в обох балках, а показники життєвості їх особин вищі за такі для ценопопуляцій A. campestre, особливо у балці Хортицького району, де спостерігається більш високий рівень рекреаційного і техногенного навантаження.Проанализированы результаты исследований основных показателей жизненности и продуктивности ценопопуляций Acer campestre L. и A. tataricum L. в двух байрачных лесах порожистой части Днепра в условиях рекреационной нагрузки. Исследованные ценопопуляции в обеих балках полночленные, нормальные, не потерявшие способности к восстановлению и самоподдержанию. Вместе с тем, полученные размерные спектры характеризуют ценопопуляции A. campestre и A. tataricum как зрелые, наблюдается старение их генеративных особей. В отличие от A. campestre, ценопопуляции A. tataricum имеют высокий восстановительный потенциал в обеих балках, а показатели жизненности их особей значительнее, чем таковые для ценопопуляций A. campestre, особенно в балке Хортицкого района, где наблюдается более высокий уровень рекреационной и техногенной нагрузки.The key indicators of the vitality and productivity of populations of Acer campestre L. and A. tataricum L. in two ravine forests of the Dnieper Rapids under recreation pressure have been analyzed. The studied coenopopulations in both ravines are normal, full-constituent; those have not lost the ability to self-renewal and self-maintenance. However, the resulting dimensional spectrum characterize A. campestre and A. tataricum coenopopulations as mature, there is an aging of their generative individuals. Unlike A. campestre, A. tataricum coenopopulations have high potential for recovery in both ravines and indicators of vitality individuals are higher than those for coenopopulations A. campestre, especially in the ravine Khortyts'ka where there is a high level of recreational and technogenic load
Letter to Alfred L. Shoemaker, February 10, 1948
Get PDFA handwritten letter from an unknown author addressed to Alfred L. Shoemaker, dated February 10, 1948. Within, the author discusses the Pennsylvania Dutch word for Ash Wednesday, along with traditions associated with this day.https://digitalcommons.ursinus.edu/shoemaker_documents/1118/thumbnail.jp
ЭЛЛИПСОМЕТРИЧЕСКИЙ КОНТРОЛЬ СОРБЦИИ БЕЛКОВ ПРИ ИСПОЛЬЗОВАНИИ PLOT-КОЛОНОК С ДЕНДРИТНОЙ СТАЦИОНАРНОЙ ФАЗОЙ
Get PDFThe article is related to the investigation of adsorption potential of proteins (albumin, insulin, lysozyme and myoglobin) on the surface of hyperbranched polymers, specifically, water-soluble oligosaccharide derivatives of polyethyleneimine, which are used as a stationery phase in capillary electrochromatography (CEC). Various protein molecules are known to be markers of different diseases. Detection and quantification of these proteins are of the highest importance for a successful disease diagnostics. However, irreversible adsorption of proteins onto the walls of the silica-fused capillary during the separation process may distort the results of the analysis. A method of ellipsometry is proposed to solve the problem. In the research we suggest to carry out the ellipsometric measurement mode in situ on the surface of a silicon wafer coated with a thin film of hyperbranched polyethyleneimine modified with maltose. According to the data of ellipsometric investigation, hyperbranched polymers are revealed to prevent protein adsorption during their electrophoretic separation.Key words: hyperbranched polyethyleneimine, ellipsometry, protein adsorption, capillary electrochromatography, PLOT-column.(Russian)DOI: http://dx.doi.org/10.15826/analitika.2014.18.1.009 V. Potolitsyna, L. Kartsova, E. Bessonova Saint-Petersburg State University (SPbU), St. Petersburg, Russian Federation Методом эллипсометрии изучена возможность сорбции белков (альбумин, инсулин, лизоцим и миоглобин) на поверхности сверхразветвленных полимеров (СРП) – водорастворимых олигосахаридных производных полиэтиленимина (PEI-Mal), используемых в качестве стационарной фазы в капиллярной электрохроматографии (КЭХ). Известно, что многие белковые молекулы являются маркерами различных заболеваний, поэтому для успешной диагностики этих заболеваний необходимо их точное количественное определение, а необратимая адсорбция белков на стенках кварцевого капилляра в процессе разделения может искажать результаты анализа, поэтому знание особенностей процессов адсорбции белков на различных поверхностях весьма актуально.В работе для исследования возможной адсорбции белков выбран метод эллипсометрии как высокочувствительный, быстродействующий и бесконтактный. Эллипсометрия неоднократно и успешно использовалась различными исследователями для изучения адсорбции различных веществ из газовой и из жидкой фаз. В работе проведены эллипсометрические измерения в режиме in situ на поверхности кремниевой пластины, покрытой тонкой пленкой сверхразветвленного полиэтиленимина, модифицированного мальтозой. Методом эллипсометрии установлено, что СРП препятствует адсорбции белков на стенках капиллярной колонки при их электрофоретическом разделении в условиях капиллярной электрохроматографии.Ключевые слова: мальтозилированный сверхразветвленный полиэтиленимин, эллипсометрия, адсорбция белков, капиллярная электрохроматография, PLOT-колонки.DOI: http://dx.doi.org/10.15826/analitika.2014.18.1.009
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