177,296 research outputs found
REGIONAL ECONOMIC DIVIDE AND THE ROLE OF TECHNOLOGICAL SPILLOVERS IN ITALY. EVIDENCE FROM MICRODATA
No full textThis paper assesses the impact of R&D efforts on production in the North and Centre-South of Italy by using a panel of 1203 manufacturing firms over the period 1998-2003. The estimations are based on a nonlinear translog production function augmented by a measure of R&D spillovers. This measure combines the geographical distance between firms, the technological similarity within each pair of firms and the technical efficiency of each firm. The estimation method takes into account the endogeneity of regressors and the potential sample selection issue regarding firms’ decision to invest in R&D. Results show that the external stock of technology exerts a higher impact in the Centre-South of Italy. Finally, it emerges that R&D capital and R&D spillovers are substitutes for Northern firms and complements for Centre-Southern firms.R&D spillovers, Italian economic divide, translog production function, technical efficiency
Cytoskeletal actin networks in motile cells are critically self-organized systems synchronized by mechanical interactions
No full textGrowing networks of actin fibers are able to organize into compact, stiff two-dimensional structures inside lamellipodia of crawling cells. We put forward the hypothesis that the growing actin network is a critically self-organized system, in which long-range mechanical stresses arising from the interaction with the plasma membrane provide the selective pressure leading to organization. We show that a simple model based only on this principle reproduces the stochastic nature of lamellipodia protrusion (growth periods alternating with fast retractions) and several of the features observed in experiments: a growth velocity initially insensitive to the external force; the capability of the network to organize its orientation; a load-history-dependent growth velocity. Our model predicts that the spectrum of the time series of the height of a growing lamellipodium decays with the inverse of the frequency. This behavior is a well-known signature of self-organized criticality and is confirmed by unique optical tweezer measurements performed in vivo on neuronal growth cones
A new species of Oecleus Stål (Hemiptera: Fulgoroidea: Cixiidae) from coconut in Brazil
No full textBartlett, Charles R., Passos, Eliana Maria Dos, Silva, Flaviana Gonçalves Da, Diniz, Leandro Eugenio Cardamone, Dollet, Michel (2018): A new species of Oecleus Stål (Hemiptera: Fulgoroidea: Cixiidae) from coconut in Brazil. Zootaxa 4472 (2): 358-364, DOI: 10.11646/zootaxa.4472.2.
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
Adaptation of maximum power point tracking controller for damaged wind turbines
No full textWind energy is essential for sustainable energy production, but its growth faces challenges. Wind turbines endure harsh conditions, such as rain, ice, dust, and sea spray, causing erosion and degrading aerodynamics. In this study, we address the relevant issue of leading-edge blade erosion. Initially, the power loss due to erosion will be quantified, considering three severity levels. Subsequently, a controller tuning strategy will be implemented to mitigate these losses during operation. Numerous design load cases (DLCs), each with different seeds, are necessary to achieve statistical significance. Therefore, it was decided to integrate the OpenFAST medium-fidelity software with high-fidelity CFD simulations to characterize erosion and quantify its effects. An initial evaluation of the aerodynamic coefficient maps was performed for the different levels of erosion. Subsequently, the potential gain was quantified by tuning the control strategy. Two sites were selected for the calculation of the Annual Energy Production (AEP) with medium-low wind speeds. Furthermore, a gain scheduling strategy that varies according to erosion and wind speed was considered, achieving positive results and an increase in AEP of up to 0.7% in the most severe case. This was achieved without any modifications to the turbine, but exclusively by acting on the existing controller
FIGURES 9–11 in A new species of Oecleus Stål (Hemiptera: Fulgoroidea: Cixiidae) from coconut in Brazil
No full textFIGURES 9–11. Oecleus sergipensis, male terminalia; 9, terminalia, left lateral view; 10, aedeagus and flagellum, right lateral view; 11, phallotheca apex and flagellum, caudal view.Published as part of Bartlett, Charles R., Passos, Eliana Maria Dos, Silva, Flaviana Gonçalves Da, Diniz, Leandro Eugenio Cardamone & Dollet, Michel, 2018, A new species of Oecleus Stål (Hemiptera: Fulgoroidea: Cixiidae) from coconut in Brazil, pp. 358-364 in Zootaxa 4472 (2) on page 362, DOI: 10.11646/zootaxa.4472.2.8, http://zenodo.org/record/144024
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
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
Letter from R. R. Zellick, Assistant Trust Officer, Anglo California National Bank of San Francisco, to Joseph R. Goodman, October 2, 1942
No full textLetter from R. R. Zellick, Assistant Trust Officer at The Anglo California National Bank of San Francisco, to Joseph R. Goodman, regarding property owned by Dave Tatsuno. Zellick mentions a dispute between current tenants and Tatsuno, and that Tatsuno has asked Goodman to help locate trustworthy tenants.Personal correspondence, organizational records, government documents, publications, and other papers created or collected by Joseph R. Goodman documenting the forced removal and incarceration of Japanese Americans during World War II, as well as organized resistance to incarceration. Included in the collection are records of the Japanese Young Men's Christian Association and the Japanese American Citizens' League in San Francisco, including papers of the Japanese YMCA's executive secretary Lincoln Kanai; Sakai family papers; Goodman's correspondence to and from Japanese American incarcerees, organizations opposing forced removal and incarceration of Japanese Americans, the War Relocation Authority, and others; publications, photographs, and ephemera from the Topaz Relocation Center, where Goodman taught high school; War Relocation Authority records and publications; and newspaper clippings, pamphlets, and reports about forced removal and incarceration created by various government, religious, and civic organizations, in California and nationwide
- …
