461,384 research outputs found
Su Ürünlerinin İnsanlara Olan Zararları
No full textSu ürünleri, insanlarýn besin gereksinimi karþýlamasý-nýn yanýnda birçok saðlýk sorununun çözümü için de yararlandýklarý önemli kaynaklar arasýndadýr. Ancak su ürünleri bu yararlarýnýn yanýnda, bazý türlerinin saldýrýcý ve yýrtýcý, bazýlarýnýn elektriki organlara sahip ve diðer birgrup ise fanerotoksik (açýk zehirli) ya da kriptotoksik (gizli zehirli) o l u þ u y l a i n s a n s a ð l ý ð ý n ý n bozulmasýna ve hatta hayatýnýn s o n l a n m a s ý n a n e d e n olabilmektedirler. Bu çalýþma da insanlar için tehlikeli oluþturabilen su ürünleri tanýtýlarak, insanlara olan etkileri üzerinde durulmaktadýr
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
Effects of quark family nonuniversality in su(3)c su(4)l u(1)x models
No full textLa cancelación de anomalías entre las familias de fermiones en la extensión SU(3)c SU(4)L U(1)X del Modelo Estándar (SM) requiere que una generación de quarks transforme de manera diferente a las otras dos bajo el grupo gauge, lo cual da lugar a Corrientes Neutras que Cambian Sabor (FCNC) a nivel árbol. Como una familia de quarks transforma diferentemente, existen tres posibles asignaciones de autoestados gauge en autoestados de masa y las implicaciones fenomenológicas del modelo dependerán de cuál asignación se elija. En este trabajo, usando datos de precisión electrodébil a la escala de la masa del bosón Z del SM, considerando violación de paridad atómica y datos experimentales de la mezcla de mesones neutros, se examinan los modelos de tres familias sin cargas eléctricas exóticas basados en la simetría SU(3)c SU(4)L U(1)X. Se estudian los efectos de la no universalidad de familias de quarks sobre las cotas al ángulo de mezcla entre las corrientes neutras presentes en los modelos estudiados y sobre las escalas de masa de los nuevos bosones de gauge predichos por la teoría. Para que las cotas inferiores sobre esas escalas de masas sean tan bajas como sea posible, la tercera familia de quarks debe transformar diferentemente bajo SU(4)L U(1)X. / Abstract Flavour changing neutral currents arise in the SU(3)c SU(4)L U(1)X extension of the standard model because anomaly cancellation among the fermion families requires one generation of quarks to transform differently from the other two under the gauge group. In the weak basis the distinction between quark families is meaningless. However, in the mass eigenstates basis, the Cabibbo-Kobayashi-Maskawa mixing matrix motivates us to classify left-handed quarks in families. In this sense there are, in principle, three different assignments of quark weak eigenstates into mass eigenstates. In this work, by using measurements at the Z-pole, atomic parity violation data and experimental input from neutral meson mixing, we examine two different models without exotic electric charges based on the 3-4-1 symmetry, and address the effects of quark family nonuniversality on the bounds on the mixing angle between two of the neutral currents present in the models and on the mass scales MZ2 and MZ3 of the new neutral gauge bosons predicted by the theory. The heaviest family of quarks must transform differently in order to keep lower bounds on MZ2 and MZ3 as low as possible without violating experimental constraints.Maestrí
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
SU(3)C X SU(3)L X U(1)X models in view of the 750 GeV diphoton signal
No full textAbstract. We analyze the recent diphoton signal reported by ATLAS and CMS collaborations in the context of three anomaly free models, the SU(6) ⊗ U(1)X ⊃ SU(3)C ⊗ SU(3)L ⊗ U(1)X embedded group, the SU(3)C ⊗SU(3)L⊗U(1)X alone and a non-universal U(1)X model, all of them with a 750 GeV scalar candidate which can decay into two photons. These models may explain the 750GeV signal by means of one loop decays to γγ through charged vector and Higgs bosons, as well as top-, bottom- and electron-like exotic particles that arise naturally from the condition of anomaly cancellations of the SU(3)C ⊗SU(3)L ⊗U(1)X models.Analizamos la reciente señal difotónica reportada por las colaboraciones ATLAS y CMS en el contexto de tres modelos libres de anomalías, el grupo embebido SU(6) ⊗ U(1)X ⊃ SU(3)C ⊗ SU(3)L ⊗ U(1)X, el grupo SU(3)C ⊗ SU(3)L ⊗ U(1)X solamente y finalmente un modelo no universal U(1)X, todos ellos con un candidato escalar de 750 GeV que puede decaer en dos fotones. Estos modelos pueden explicar la señal de 750GeV por medio de decaimientos a un bucle a γγ mediante bosones de Higgs cargados, así como a través de quarks top, bottom y electrones exóticos que aparecen de manera natural de la condición de la cancelación de anomalías de los modelos SU(3)C ⊗ SU(3)L ⊗ U(1)X.Maestrí
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
A proof of concept of a BioMEMS glucose biosensor using microfabricated SU-8 films
No full textThe present project investigated and proved the concept of developing a novel
BioMEMS glucose micro-biosensor using a simple one-step microfabrication process of
the widely used SU-8 polymer. More specifically, the study focused on the investigation
of the suitability of the SU-8 polymer as a matrix for enzyme immobilisation that is
carried out during the microfabrication process. A comparative study between
commercially available SU-8 and “customised” SU-8 solutions showed that the
optimum concentration of photo-initiator for stress reduction can be achieved easier
with “customised” SU-8 solutions. The most appropriate type of microstructure for the
SU-8 matrix and the corresponding required microfabrication process were defined and
encapsulation of the enzyme GOx in the SU-8 solution was accomplished. A detailed
experimental investigation of the immobilised enzyme’s activity inside the SU-8 matrix,
was carried out using amperometric detection of hydrogen peroxide in a 3-electrode setup.
SU-8 films were immersed in a buffer solution and the platinum working electrode
was brought in close contact with the film. Films without enzyme showed negligible
variation in current upon the addition of glucose, as opposed to films with encapsulated
enzyme which showed a very clear increase in current. Experiments using films of
increased thickness or enzyme concentration, showed a higher response, thus proving
that the enzyme remained active not only on the film’s surface, but inside the matrix as
well. In the fluorescence spectroscopy experiments, the utilisation of the tris (4,7-
diphenyl-1,10-phenanthroline) ruthenium(II) dichloride oxygen indicator, which was
also captured in the polymer matrix during the microfabrication process, was proven to
be very sensitive to glucose concentration changes during the glucose oxidation and
there was no photo-bleaching.
The experimental investigations proved that the proposed concept of using SU-8
matrices for the immobilisation of biomolecules, is a valid proposal for the construction
of a BioMEMS glucose biosensor. An important outcome was the successful
immobilisation of glucose oxidase in SU-8 microfabricated structures. The enzyme still
showed activity despite the “hostile” conditions during microfabrication The proof of
principle of enzyme immobilisation in SU-8 films opens up new possibilities for
combining BioMEMS with biosensors and organic electronics
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
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