117,549 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
No full textWe 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
No full textWe 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
Letter to Alfred L. Shoemaker, February 10, 1948
No full textA 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
Investigating the genetic requirements for the PCNA interacting motifs in Pif1 family helicases in Saccharomyces cerevisiae
No full textStable maintenance and transmission of the genetic material requires tight coordination between DNA replication and DNA repair. One of the factors that couples DNA replication and DNA repair is proliferative cell nuclear antigen (PCNA). PCNA is a homotrimeric complex that encircles DNA and plays a structural role interacting with different enzymes, tethering them to DNA and promoting their catalytic activity. PCNA is heavily post-translationally regulated, which was shown to change its affinity to the interacting partners and therefore to confer differential recruitment of the required proteins to the DNA substrates.
Pif1 family of DNA helicases in Saccharomyces cerevisiae is composed of the two paralogues Pif1 and Rrm3. In addition to the overlapping functions during DNA replication, Pif1 and Rrm3 have certain distinct roles. Rrm3 is required for DNA replication through the “hard-to-replicate” regions, such as rDNA repeats, telomeres and origins of replication. The unique functions of Pif1 involve telomerase inhibition at telomeres and at DNA double-strand breaks (DSBs) and promotion of break induced replication (BIR). The underlying mechanism that defines functional specialisation of Pif1 family helicases is not understood.
Both Pif1 and Rrm3 were shown earlier to physically interact with PCNA. The experiment presented here shows that, in addition to the previously reported C-terminal PCNA interacting peptides (PIP1 and PIP2), the N-terminus of Pif1 contains putative PCNA interacting motifs (PIP3 and SIM). The Pif1 roles in DNA replication, BIR and telomerase inhibition require different PCNA-interacting motifs. In addition, Pif1 recruitment to stalled forks and DSBs was PCNAdependent.
Despite the fact that the Pif1-PCNA complex was shown to be required for Pol δ-mediated DNA synthesis during BIR, it is still not clear if other stages of this DNA repair pathway are Pif1-dependent. This study shows that the broken strand invasion and the initiation of DNA synthesis during BIR occur independently of Pif1, however both the long-range DNA synthesis and re-synthesis of the resected strand require Pif1 and its previously reported Rad53/Dun1-dependent phosphorylation.
Based on the published data, the interaction between Rrm3 and PCNA occurs via the N-terminally located PCNA interacting motif (PIP1 in Rrm3). The experiment presented here shows that PIP1 in Rrm3 was not required for DNA replication through the sites that require Rrm3 helicase. In contrast, replication associated function of Rrm3 required the C-terminally located putative PCNA interacting motif (PIP2 in Rrm3), homologous to the previously reported C-terminal PCNA interacting motif in Pif1 (PIP2 in Pif1).
Overall, this work provides a systematic characterisation of the newly identified and previously reported pif1 and rrm3 alleles and shows that different functions of Pif1 can be distinguished by the genetic requirements for its PCNAinteracting elements. Based on the obtained data, I would like to hypothesise that differential recruitment of Pif1 helicases via interaction with PCNA could be the reason of the functional specialisation of Pif1 and Rrm3
Вплив некругової форми тору на магнітні поверхні двозаходного (l=2) торсатрону
No full textThe numerical calculations of magnetic field of the l=2 torsatron magnetic system with non-circular poloidal cross-section of the torus is carried out in the work. It is shown that the value δi≈0.2 of maximal relative deviation of a non-circular poloidal cross-section from basic circular one results in a several-fold contraction of closed magnetic surface existence region. There is some increase in the values of rotational transform angle and the mirror ratio in the central closed magnetic surfaces. An enlarged clearance between the outer boundary of field line stochastic layer, i.e., the boundary of the plasma layer having transient plasma parameters (SOL plasma) and the surface of vacuum chamber can be obtained by the transition from the circular torus to the non-circular torus under consideration.Проведены численные расчеты модели магнитной системы l=2 торсатрона с некруговым полоидальным сечением тора. Показано, что максимальная величина относительного отклонения δi≈0,2 полоидального сечения некругового тора от базисного кругового сечения приводит к уменьшению области существования замкнутых магнитных поверхностей и некоторому увеличению величины угла вращательного преобразования и пробочного отношения на центральных магнитных поверхностях. Существенно увеличилось расстояние между слоем стохастических силовых линий, т.е. между плазмой переходных параметров (SOL-плазмы) и поверхностью вакуумной камеры.Проведені чисельні розрахунки моделі магнітної системи l=2 торсатрона з некруглим полоїдальним перерізом тора. Показано, що максимальна величина відносного відхилення δi≈0,2 полоїдального перерізу некруглого тора від базисного круглого перерізу призводить до зменшення області існування замкнутих магнітних поверхонь та до збільшення величини кута обертового перетворення і величини дзеркального відношення на центральних магнітних поверхнях. Суттєво збільшилася відстань між прошарком стохастичних силових ліній, тобто між плазмою перехідних параметрів (SOL-плазмою) і поверхнею вакуумної камери
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