18,717 research outputs found
Web of Science citation gaps: An automatic approach to detect indexed but missing citations
The number of citations a research paper receives is a crucial metric for both researchers and institutions. However, since citation databases have their own source lists, finding all the citations of a given paper can be a challenge. As a result, there may be missing citations that are not counted towards a paper’s total citation count. To address this issue, we present an automated approach to find missing citations leveraging the use of multiple indexing databases. In this research, Web of Science (WoS) serves as a case study and OpenAlex is used as a reference point for comparison. For a given paper, we identify all citing papers found in both research databases. Then, for each citing paper we check if it is indexed in WoS, but not referred in WoS as a citing paper, in order to determine if it is a missing citation. In our experiments, from a set of 1539 papers indexed by WoS, we found 696 missing citations. This outcome proves the success of our approach, and reveals that WoS does not always consider the full list of citing papers of a given publication, even when these citing papers are indexed by WoS. We also found that WoS has a higher chance of missing information for more recent publications. These findings provide relevant insights about this indexing research database, and provide enough motivation for considering other research databases in our study, such as Scopus and Google Scholar, in order to improve the matching and querying algorithms, and to reduce false positives, towards providing a more comprehensive and accurate view of the citations of a paper.info:eu-repo/semantics/publishedVersio
Bilateral negotiation in a multi-agent supply chain system
A supply chain is a set of organizations directly linked by flows of services from suppliers to customers. Supply chain activities range from the ordering and receipt of raw materials to the production and distribution of finished goods. Supply chain management is the integration of key activities across a supply chain for the purposes of building competitive infrastructures, synchronizing supply with demand, and leveraging worldwide logistics. This paper addresses the challenges created by supply chain management towards improving long-term performance of companies. It presents a multi-agent supply chain system composed of multiple software agents, each responsible for one or more supply chain activities, and each interacting with other agents in the execution of their responsibilities. Additionally, this paper presents the key features of a negotiation model for software agents. The model handles bilateral multi-issue negotiation and incorporates an alternating offers protocol, a set of logrolling strategies, and a set of negotiation tactics
Hybrid Model For Word Prediction Using Naive Bayes and Latent Information
Historically, the Natural Language Processing area has been given too much
attention by many researchers. One of the main motivation beyond this interest
is related to the word prediction problem, which states that given a set words
in a sentence, one can recommend the next word. In literature, this problem is
solved by methods based on syntactic or semantic analysis. Solely, each of
these analysis cannot achieve practical results for end-user applications. For
instance, the Latent Semantic Analysis can handle semantic features of text,
but cannot suggest words considering syntactical rules. On the other hand,
there are models that treat both methods together and achieve state-of-the-art
results, e.g. Deep Learning. These models can demand high computational effort,
which can make the model infeasible for certain types of applications. With the
advance of the technology and mathematical models, it is possible to develop
faster systems with more accuracy. This work proposes a hybrid word suggestion
model, based on Naive Bayes and Latent Semantic Analysis, considering
neighbouring words around unfilled gaps. Results show that this model could
achieve 44.2% of accuracy in the MSR Sentence Completion Challenge
Recuperação de larvas de nematóides tricostrongilídeos em sistemas de integração pecuária-floresta
On the Slow Drift of Solstices: Milankovic Cycles and Mean Global Temperature
The Earth's revolution is modified by changes in inclination of its rotation
axis. Despite the fact that the gravity field is central, the Earth's
trajectory is not closed and the equinoxes drift. Milankovic (1920) argued that
the shortest precession period of solstices is 20,7kyr: the Summer solstice in
one hemisphere takes place alternately every 11kyr at perihelion and at
aphelion. We have submitted the time series for the Earth's pole of rotation,
global mean surface temperature and ephemeris to iterative Singular Spectrum
Analysis. iSSA extracts from each a trend, a 1yr and a 60yr component. Both the
apparent drift of solstices of Earth around the Sun and the global mean
temperature exhibit a strong 60yr oscillation. The "fixed dates" of solstices
actually drift. Comparing the time evolution of the Winter and Summer solstices
positions of the rotation pole and the first iSSA component (trend) of the
temperature allows one to recognize some common features. A basic equation from
Milankovic links the derivative of heat received at a given location on Earth
to solar insolation, known functions of the location coordinates, solar
declination and hour angle, with an inverse square dependence on the Sun-Earth
distance. We have translated the drift of solstices as a function of distance
to the Sun into the geometrical insolation theory of Milankovic. Shifting the
inverse square of the 60yr iSSA drift of solstices by 15 years with respect to
the first derivative of the 60yr iSSA trend of temperature, that is exactly a
quadrature in time, puts the two curves in quasi-exact superimposition. The
probability of a chance coincidence appears very low. Correlation does not
imply causality when there is no accompanying model. Here Milankovic's equation
can be considered as a model that is widely accepted. This paper identifies a
case of agreement between observations and a mathematical formulation
Efeito de produtos alternativos utilizados no controle da Cochonilha-do-Carmim sobre o inimigo natural Cryptolaemus montrouzieri.
Conduziuse experimento no laboratório de Entomologia da Embrapa Semi-Árido sob condições controladas de temperatura 25±1oC) e fotofase (12 horas), utilizando-se insetos provenientes de criação do laboratório e as mesmas dosagens recomendadas para o controle da praga no campo
Comparación del crecimiento, propiedades del suelo y análisis químico del follaje entre masas puras y mixtas
Ecosystems with mixed species compared to the ones with pure compositions provide a broader range of options in the fields of biodiversity, conservation, protection and restoration. Industrial plantations in Portugal are mostly monocultures with the predominance of coniferous forests, so the introduction of broadleaves could be important for the biodiversity and sustainability of Portuguese forests. This study aims to present and discuss field data from pure and mixed-species plantations of European chestnut (Castanea sativa Mill.) and douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] with different intercropping densities in a total of 5 treatments with two replicate blocks. In respect to growth, the results showed significant difference (P < 0.05, Scheffe) between treatments for survival and basal area. Diameter breast height (DBH), total and top height of the individual Castanea tree was positively affected by the presence of Pseudotsuga. In general, soil properties results showed a higher fertility for mixed treatments compared with pure ones. Statistically differences (P < 0.05, Scheffe) were observed in pH, P, Mn and in the exchangeable acidity. Results for foliar analysis in N, P, Ca and K concentrations are higher for mixed treatments. The obtained results from this study indicate that mixed plantations have a positive effect in the productivity of the Castanea.Los ecosistemas con especies mixtas, en comparación con las masas puras, proporcionan una gama más amplia de
opciones en el campo de la biodiversidad, la conservación, la protección y la restauración. Las plantaciones industriales
de Portugal son en su mayoría monocultivos con predominio de bosques de coníferas, por lo que la introducción
de frondosas podría ser importante para la biodiversidad y la sostenibilidad de los bosques portugueses.
Este estudio tiene como objetivo presentar y discutir los datos de campo de plantaciones puras y mixtas de especies
de castaño y de abeto de Douglas con diferentes densidades de cultivo intercalado en un total de 5 tratamientos
con dos bloques. En lo que respecta al crecimiento, los resultados mostraron diferencias significativas (P < 0,05) entre
los tratamientos para la supervivencia y el área basal. El diámetro normal (DAP), la altura total y la altura dominante
del Castaño se vio afectado positivamente por la presencia de Pseudotsuga. En general, las propiedades del suelo
mostraron una mayor fecundidad de los tratamientos mixtos en comparación con los puros. Se observaron diferencias
estadísticamente significativas (P < 0,05) en el pH, P, Mn y en la acidez intercambiable. Los resultados de los análisis
foliares de N, P, Ca y la concentración de K son mayores para los tratamientos mixtos. Los resultados obtenidos
de este estudio indican que las plantaciones mixtas tienen un efecto positivo en la productividad del Castaño
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Stage-Specific Expression Profiling of <i>Drosophila</i> Spermatogenesis Suggests that Meiotic Sex Chromosome Inactivation Drives Genomic Relocation of Testis-Expressed Genes
In Drosophila, genes expressed in males tend to accumulate on autosomes and are underrepresented on the X chromosome. In particular, genes expressed in testis have been observed to frequently relocate from the X chromosome to the autosomes. The inactivation of X-linked genes during male meiosis (i.e., meiotic sex chromosome inactivation—MSCI) was first proposed to explain male sterility caused by X-autosomal translocation in Drosophila, and more recently it was suggested that MSCI might provide the conditions under which selection would favor the accumulation of testis-expressed genes on autosomes. In order to investigate the impact of MSCI on Drosophila testis-expressed genes, we performed a global gene expression analysis of the three major phases of D. melanogaster spermatogenesis: mitosis, meiosis, and post-meiosis. First, we found evidence supporting the existence of MSCI by comparing the expression levels of X- and autosome-linked genes, finding the former to be significantly reduced in meiosis. Second, we observed that the paucity of X-linked testis-expressed genes was restricted to those genes highly expressed in meiosis. Third, we found that autosomal genes relocated through retroposition from the X chromosome were more often highly expressed in meiosis in contrast to their X-linked parents. These results suggest MSCI as a general mechanism affecting the evolution of some testis-expressed genes.</p
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