177,870 research outputs found
Ni-based water photocatalysts for hydrogen evolution, and physical mechanism behind photocatalysis
No full textAbstract
This doctoral thesis is dedicated to the exploration and enhancement of Nibased water photocatalysts, with a focus on their potential for efficient hydrogen evolution and unraveling the underlying physical mechanisms governing photocatalysis. The primary focus is on the utilization of commercial Ni@NiO/NiCO3 with varied sizes, subjected to vacuum annealing thermal treatment to enhance their photocatalytic properties. Additionally, the incorporation of Ag as a buffer element, facilitates the attachment of Ni to multilayered MoS2, resulting in the formation of a MoS2 -Ag-Ni ternary composite. Furthermore, the synthesis of hierarchical Nickel carbonate hydroxide via the hydrothermal method is investigated. A comprehensive characterization of the synthesized materials is carried out using various microscopic techniques (SEM, TEM, HRTEM, etc.) and spectroscopic tools (UV-vis, XPS, XRD, EDS, etc.) to provide detailed insights into the structural and chemical composition of the materials. The synthesized materials are then subjected to photocatalytic water splitting experiments, wherein hydrogen production under visible light irradiation is investigated. The outcomes of this research not only contribute to the advancement of Ni-based photo catalysts but also enhance our understanding of the complicated interplay between material structures and their photocatalytic performance. Original papers Talebi, P., Singh, H., Rani, E., Huttula, M., & Cao, W. (2021). Surface plasmon-driven photocatalytic activity of Ni@NiO/NiCO3 core–shell nanostructures. RSC Advances, 11(5), 2733–2743. https://doi.org/10.1039/D0RA09666K. https://doi.org/10.1039/D0RA09666K Self-archived version Talebi, P., Kistanov, A. A., Rani, E., Singh, H., Pankratov, V., Pankratova, V., King, G., Huttula, M., & Cao, W. (2022). Unveiling the role of carbonate in nickel-based plasmonic core@shell hybrid nanostructure for photocatalytic water splitting. Applied Energy, 322, 119461. https://doi.org/10.1016/j.apenergy.2022.119461. https://doi.org/10.1016/j.apenergy.2022.119461 Self-archived version Talebi, P., Rani, E., Niu, Y., Zakharov, A., & Cao, W. (2023). Spectromicroscopic determinations of chemical environments of Ni in MoS2‐Ag‐Ni ternary systems. X-Ray Spectrometry, 52(1), 38–45. https://doi.org/10.1002/xrs.3314. https://doi.org/10.1002/xrs.3314 Talebi, P., Greco, R., Yamamoto, T., Zeynali, M., Asgharizadeh, S., & Cao, W. (2024). Hierarchical nickel carbonate hydroxide nanostructures for photocatalytic hydrogen evolution from water splitting. Materials Advances, 5(7), 2968–2973. https://doi.org/10.1039/D3MA00977G. https://doi.org/10.1039/D3MA00977G Self-archived version Osajulkaisut Talebi, P., Singh, H., Rani, E., Huttula, M., & Cao, W. (2021). Surface plasmon-driven photocatalytic activity of Ni@NiO/NiCO3 core–shell nanostructures. RSC Advances, 11(5), 2733–2743. https://doi.org/10.1039/D0RA09666K. https://doi.org/10.1039/D0RA09666K Rinnakkaistallennettu versio Talebi, P., Kistanov, A. A., Rani, E., Singh, H., Pankratov, V., Pankratova, V., King, G., Huttula, M., & Cao, W. (2022). Unveiling the role of carbonate in nickel-based plasmonic core@shell hybrid nanostructure for photocatalytic water splitting. Applied Energy, 322, 119461. https://doi.org/10.1016/j.apenergy.2022.119461. https://doi.org/10.1016/j.apenergy.2022.119461 Rinnakkaistallennettu versio Talebi, P., Rani, E., Niu, Y., Zakharov, A., & Cao, W. (2023). Spectromicroscopic determinations of chemical environments of Ni in MoS2‐Ag‐Ni ternary systems. X-Ray Spectrometry, 52(1), 38–45. https://doi.org/10.1002/xrs.3314. https://doi.org/10.1002/xrs.3314 Talebi, P., Greco, R., Yamamoto, T., Zeynali, M., Asgharizadeh, S., & Cao, W. (2024). Hierarchical nickel carbonate hydroxide nanostructures for photocatalytic hydrogen evolution from water splitting. Materials Advances, 5(7), 2968–2973. https://doi.org/10.1039/D3MA00977G. https://doi.org/10.1039/D3MA00977G Rinnakkaistallennettu versio Academic Dissertation to be presented with the assent of the Faculty of Science, University of Oulu, Finland for public discussion in the Auditorium L5, on June 13th, 2024, at 12 o’clock (EEST) noon.Abstract
This doctoral thesis is dedicated to the exploration and enhancement of Nibased water photocatalysts, with a focus on their potential for efficient hydrogen evolution and unraveling the underlying physical mechanisms governing photocatalysis. The primary focus is on the utilization of commercial Ni@NiO/NiCO3 with varied sizes, subjected to vacuum annealing thermal treatment to enhance their photocatalytic properties. Additionally, the incorporation of Ag as a buffer element, facilitates the attachment of Ni to multilayered MoS2, resulting in the formation of a MoS2 -Ag-Ni ternary composite. Furthermore, the synthesis of hierarchical Nickel carbonate hydroxide via the hydrothermal method is investigated. A comprehensive characterization of the synthesized materials is carried out using various microscopic techniques (SEM, TEM, HRTEM, etc.) and spectroscopic tools (UV-vis, XPS, XRD, EDS, etc.) to provide detailed insights into the structural and chemical composition of the materials. The synthesized materials are then subjected to photocatalytic water splitting experiments, wherein hydrogen production under visible light irradiation is investigated. The outcomes of this research not only contribute to the advancement of Ni-based photo catalysts but also enhance our understanding of the complicated interplay between material structures and their photocatalytic performance
Species diversity and community structure of braconid wasps (Hymenoptera) in two ecological hotspots of Iran: implication for conservation
No full text<p><span><span>Species diversity and community structure of braconid wasps (Hymenoptera) <a name="_Hlk115346465"></a>in two ecological hotspots of <a name="_Hlk115825047"></a><span>Iran</span>: implication for conservation </span></span></p>
<p><span>Parisa Abdoli<sup>1</sup>, Ali Asghar Talebi<sup>1</sup></span><a title="" href="#_ftn1" name="_ftnref1"><sup><span><span>*</span></span></sup></a><span>, Nickolas G. Kavallieratos<sup>2</sup>, Samira Farahani<sup>3­</sup> and Rasoul Khosravi<sup>4</sup> </span></p>
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<p><span>1. Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, Tehran, I.R. Iran. <a name="_Hlk533412392"></a>[email protected]; [email protected]</span></p>
<p><span>2. Laboratory of Agricultural Zoology and Entomology, Department of Crop Science, Agricultural University of Athens; 75 Iera Odos <span> </span>str., 11855 Athens, Attica, Greece. </span><span>[email protected]</span></p>
<p><span>3. Research Institute of Forests and Rangelands, Agricultural Research Education and Extension Organization (AREEO), Tehran, I. R. Iran.<span> </span></span><a href="mailto:[email protected]"><span>[email protected]</span></a></p>
<p><span><span>4. Department of Natural Resources and Environmental Engineering, College of Agriculture, Shiraz University, Shiraz, Iran, [email protected]</span></span></p>
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<p><a title="" href="#_ftnref1" name="_ftn1"><span><span><span>*</span></span></span></a><span> </span>Correspondence<span>. E-mail: [email protected]</span></p>
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An Inhomogeneous Point-process Model for the Assessment of the Brain-to-Heart Functional Interplay: A Pilot Study
No full textWe propose a novel computational framework for the estimation of functional directional brain-to-heart interplay in an instantaneous fashion. The framework is based on inhomogeneous point-process models for human heartbeat dynamics and employs inverse-Gaussian probability density functions characterizing the timing of R-peak events. The instantaneous estimation of the functional directional coupling is based on the definition of point-process transfer entropy, which is here retrieved from heart rate variability (HRV) and Electroencephalography (EEG) power spectral series gathered from 12 healthy subjects undergoing significant sympathovagal changes induced by a cold-pressor test. Results suggest that EEG oscillations dynamically influence heartbeat dynamics with specific time delays in the 30-60s and 90-120s ranges, and through a functional activity over specific cortical regions
Time-Resolved Brain-to-Heart Probabilistic Information Transfer Estimation Using Inhomogeneous Point-Process Models
No full textObjective: The quantification of functional brain-heart interplay through the dynamics of the central and autonomic nervous systems may provide effective biomarkers for cognitive, emotional, and autonomic state changes. Despite several computational models were proposed to this end, none provides a directional estimation of such interplay in a time-resolved and probabilistic fashion. Methods: In this study, a multivariate inhomogeneous point-process model for heartbeat dynamics is employed to derive subject-specific, time-resolved, functional estimates of the directional interplay occurring from the brain to the heart, whose activity is represented by electroencephalography and R-peaks intervals series. An inverse-Gaussian probability density function is used to predict heartbeat events as a function of neural dynamics, which is modeled as an exogenous input to the autoregressive cardiac dynamics. Results: The performance is evaluated using heart rate variability and electroencephalography series gathered from 24 healthy volunteers undergoing a cold-pressor test, and the modeling goodness-of-fit is assessed through the time-rescaling theorem. The results suggest that cortical dynamics drives heartbeat series with specific time delays in the range of 30s to 60s and 90s to 120s from the peripheral thermal stress onset. Conclusion: The proposed framework provides novel insights in human neurophysiology, exploiting a fully probabilistic definition of the continuous functional brain-heart interplay
Instantaneous Brain-to-Heart Functional Assessment using Inhomogeneous Point-process Models: a Proof of Concept Study
No full textWe introduce a new computational model for estimating the directional brain-heart interplay (BHI) in an instantaneous fashion using inhomogeneous point processes. Brain dynamics is considered as the exogenous input to a bivariate model predicting the first-order moment of an inverse-Gaussian function characterizing heartbeat dynamics continuously. Transfer entropy using brain- and heartbeat-related parameters finally quantifies the functional interplay from the brain to the heart. Here, we preliminarily evaluate our framework by studying heart rate variability (HRV) and electroencephalographic (EEG) series from 12 healthy subjects undergoing a cold-pressor test. Results suggest that cortical dynamics regulates heartbeat with specific time delays in the 30-60s and 90-120s ranges
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
Pristomerus persicus Riedel & Ameri & Talebi & Ebrahimi 2019, nov.sp.
No full textPristomerus persicus nov.sp. (figs 15-17) T y p e m a t e r i a l: Holotype:♂ ̎ Iran: Markazi Prov., Arak, Haftad-Gholleh, Protected area, Chekab valley, 2090 m, N 34°08́07.2́́ E 50°15́56.1́́, Malaise trap, 11.vi.-20.vii.2018, leg. M. Parachami-Araghi̎ (ZSM, Munich). D e s c r i p t i o n: ♂: Body length 6.5 mm. Antenna with 30 flagellomeres; 1st flagel- lomere 4.0x longer than wide, 2 nd flagellomere 3.5x longer than wide, preapical flagellomeres slightly longer than wide. Temple strongly and roundly narrowed behind eye. Ocelli large, distance of lateral ocellus to eye 0.5x ocellar diameter. Frons finely granulate and with scattered punctures. Face smooth, with scattered punctures. Minimal distance of compound eyes 0.39x width of head. Malar space length 0.7x width of mandibular base. Pronotum smooth. Mesoscutum with very scattered punctures, mainly along notauli, otherwise smooth. Scuto-scutellar groove with 4 fine longitudinal ridges, scutellum smooth. Mesopleuron and metapleuron densely punctate, speculum smooth. Propodeum completely carinate, densely punctate, area petiolaris with transversal rugae. Area basalis trapezoid, c.1.5x longer than wide. Area superomedia c.2.8x longer than wide. Hind coxa granulate and with scattered punctures. Hind femur stout, c.3.0x longer than wide; ventral tooth at 0.65 of femoral length and 0.83x as long as basal width of hind tibia. First intercubitus of fore wing c.1.5x longer than vein between cubitus and 2 nd recurrent vein; nervulus interstitial. Nervellus of hind wing intercepted at apical 0.8. Postpetiolus, 2 nd tergite completely and basal 1/4 of 3 rd tergite finely striate. 2 nd tergite c.1.9x longer than wide. Color: Yellowish-red. Scapus and pedicellus reddish; flagellum black. Cream-yellow are palps, mandible except teeth, clypeus, face, orbits, lateral and paramedian stripes of mesoscutum (confluent anteriorly), scutellum except red basomedian spot, apical spots on mesopleuron and metapleuron and apical 1/4 of propodeum. Black are occiput, scutellar groove and base of propodeum. 1 st to 3 rd tergites blackish basally and with creamyellow apical bands. Legs red; apical spots on coxae, trochanters and femora creamyellow; hind tibia cream-yellow externally; mid and hind tarsi brownish. Wings hyaline; pterostigma brown, pale proximally. ♀ unknown. Remark: This new species runs to Pristomerus arabicus HORSTMANN in his key of West Palaearctic Pristomerus species (HORSTMANN 1990), but differs by its larger ocelli, stouter hind femur and a different color pattern.Published as part of Riedel, Matthias, Ameri, Ali, Talebi, Ali Asghar & Ebrahimi, Ebrahim, 2019, Contribution to the Ɨchneumonidae (Hymenoptera) oI Ɨran, with descriptions oI seven new species, pp. 361-390 in Linzer biologische Beiträge 51 (1) on pages 369-370, DOI: 10.5281/zenodo.375834
Association mapping for identifying chromosome regions associated to Septoria tritici blotch response in durum wheat
No full text"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
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