Search

Your search keyword '"Sergio, N"' showing total 1,216 results
Start Over Author "Sergio, N"
1,216 results on '"Sergio, N"'

162. Phase Composition and Temperature Effect on the Dynamic Young’s Modulus, Shear Modulus, Internal Friction, and Dilatometric Changes in AISI 4130 Steel

Author

Monteiro, Lioudmila A. Matlakhova, Emanuel C. Pessanha, Henrique Alves, Natalia A. Palii, and Sergio N.

Subjects
elastic properties, low-alloy steel, heat treatment, structural stability, martensitic phase, phase transformation, impulse excitation technique
Abstract

Elastic properties of materials and their changes with temperature are important for their applications in engineering. In the present study the influence of phase composition and temperature of AISI 4130 alloy on Young’s modulus (Ed), shear modulus (Gd), and damping (Q−1) was carried out by the impulse excitation technique (IET). The material characterization was performed using confocal microscopy, XRD, SEM, HV, and dilatometry. A stable structure, composed of ferrite (BCC) and pearlite (α-Fe + Fe3C), was obtained by annealing. Metastable structure of martensite (BCT) was obtained by quenching. The Ed, Gd, and Q−1 were measured by varying the temperature from RT to 900 °C. The values of Ed and Gd, at RT, were determined as 201.5 and 79.2 GPa (annealed) and 190.13 and 76.5 GPa (quenched), respectively. In the annealed steel, the values Ed and Gd decrease linearly on heating up to 650 °C, with thermal expansion. In the quenched steel, weak changes occurred in the dilatometric curve, Ed, Gd, and Q−1, in the range of 350–450 °C, which indicated decompositions of the martensitic phase. A sharp decrease in the moduli and high peak of Q−1 were observed for both samples around 650–900 °C, revealing low lattice elastic stability of the phases during transformations α(BCC) + Fe3Cγ(FCC).

Published
2023
Full Text
View/download PDF

164. Temperature Effect on the Dynamic Young’s Modulus, Shear Modulus, Internal Friction, and Dilatometric Changes in Quenched and Annealed AISI4130 Steel

Author

Lioudmila A. Matlakhova, Emanuel C. Pessanha, Henrique Alves, Natalia A. Palii, and Sergio N. Monteiro

Abstract

Elastic properties of materials and their changes with temperature are important for their applications in engineering. A study on the influence of phase composition of AISI 4130 alloy on Young's modulus (Ed), shear modulus (Gd), and damping (Q-1) was carried out by Impulse Excitation Technique (IET). The material characterization was carried out using confocal microscopy, XRD, MET, HV, and dilatometry. A stable structure, composed of ferrite (BCC) and pearlite (α-Fe+Fe3C), was obtained by annealing. Metastable structure of martensite (BCT) was obtained by quenching. The Ed, Gd, and Q-1 were measured, varying the temperature from RT to 900 °C. The values of Ed and Gd, at RT, were determined as 201.5 and 79.2 GPa (annealed), and 190.13 and 76.5 GPa (quenched), respectively. In the annealed steel, the values Ed and Gd decrease linearly on heating up to 650 °C, with the thermal expansion. In the quenched steel, weak changes in the dilatometric curve, Ed, Gd, and Q-1, in the range of 350-450 °C, indicated decompositions of the martensitic phase. Sharp decrease in the moduli and high peak of Q-1, was observed for both samples around 650-900 °C, revealing low lattice elastic stability of the phases during transformations α(BCC)+Fe3C↔γ(FCC).

Published
2023
Full Text
View/download PDF

166. Evaluating the Latest IMERG Products in a Subtropical Climate: The Case of Paraná State, Brazil

Author

Jéssica G. Nascimento, Daniel Althoff, Helizani C. Bazame, Christopher M. U. Neale, Sergio N. Duarte, Anderson L. Ruhoff, and Ivo Z. Gonçalves

Subjects
remote sensing in hydrology, precipitation, performance evaluation, GPM, Science
Abstract

The lack of measurement of precipitation in large areas using fine-resolution data is a limitation in water management, particularly in developing countries. However, Version 6 of the Integrated Multi-satellitE Retrievals for GPM (IMERG) has provided a new source of precipitation information with high spatial and temporal resolution. In this study, the performance of the GPM products (Final run) in the state of Paraná, located in the southern region of Brazil, from June 2000 to December 2018 was evaluated. The daily and monthly products of IMERG were compared to the gauge data spatially distributed across the study area. Quantitative and qualitative metrics were used to analyze the performance of IMERG products to detect precipitation events and anomalies. In general, the products performed positively in the estimation of monthly rainfall events, both in volume and spatial distribution, and demonstrated limited performance for daily events and anomalies, mainly in mountainous regions (coast and southwest). This may be related to the orographic rainfall in these regions, associating the intensity of the rain, and the topography. IMERG products can be considered as a source of precipitation data, especially on a monthly scale. Product calibrations are suggested for use on a daily scale and for time-series analysis.

Published
2021
Full Text
View/download PDF

172. Modelling and Application of Jutes Fiber Reinforced Epoxy Composite in the Development of Wind Blade for Low Intensity Winds

Author

Junio, Raí Felipe Pereira, primary, Cardoso, Robson Luis B., additional, Ramos, Roberto Paulo B., additional, Filha, Elza M. Leão, additional, Ribeiro, Mauricio M., additional, Candido, Verônica S., additional, Rodrigues, Jean da S., additional, Silva, Douglas Santos, additional, Monteiro, Sergio N., additional, and Fujiyama, Roberto T., additional

Published
2023
Full Text
View/download PDF

179. Impact Assessment of Interregional Government Transfers: Lessons from the Brazil Experience

Author

Haddad, Eduardo A., Luque, Carlos A., Lima, Gilberto T., Sakurai, Sergio N., Costa, Silvio M., Fischer, Manfred M., Series editor, Snickars, Folke, Series editor, Hewings, Geoffrey J. D., Series editor, Nijkamp, Peter, Series editor, Thill, Jean-Claude, Series editor, van van Dijk, Jouke, Series editor, Cuadrado-Roura, Juan R., editor, and Aroca, Patricio, editor

Published
2013
Full Text
View/download PDF

183. Thermal Noise Estimation and Removal in MRI: A Noise Cancellation Approach

Author

Soto, Miguel E., Pezoa, Jorge E., Torres, Sergio N., Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, San Martin, César, editor, and Kim, Sang-Woon, editor

Published
2011
Full Text
View/download PDF

184. A cnidarian phylogenomic tree fitted with hundreds of 18S leaves

Author

Melissa B. DeBiasse, Ariane Buckenmeyer, Jason Macrander, Leslie S. Babonis, Bastian Bentlage, Paulyn Cartwright, Carlos Prada, Adam M. Reitzel, Sergio N. Stampar, Allen G. Collins, Marymegan Daly, and Joseph F. Ryan

Abstract

Cnidarians are critical members of aquatic communities and have been an experimental system for a diversity of research areas ranging from development to biomechanics to global change biology. Yet we still lack a well-resolved, taxonomically balanced, cnidarian tree of life to place this research in appropriate phylogenetic context. To move towards this goal, we combined data from 26 new anthozoan transcriptomes with 86 previously published cnidarian and outgroup datasets to generate two 748-locus alignments containing 123,051 (trimmed) and 449,935 (untrimmed) amino acids. We estimated maximum likelihood phylogenies for both matrices under partitioned and unpartitioned site-homogeneous and site-heterogenous models of substitution. We used the resulting topology to constrain a phylogenetic analysis of 1,814 small subunit ribosomal (18S) gene sequences from GenBank. Our results confirm the position of Ceriantharia (tube-dwelling anemones), a historically recalcitrant group, as sister to the rest of Hexacorallia across all phylogenies regardless of data matrix or model choice. We also find unanimous support for the sister relationship of Endocnidozoa and Medusozoa and propose the name Operculozoa for the clade uniting these taxa. Our 18S hybrid phylogeny provides insight into relationships of 15% of extant taxa. Together these data are an invaluable resource for comparative cnidarian research and provide perspective to guide future refinement of cnidarian systematics.

Published
2022
Full Text
View/download PDF

188. A cnidarian phylogenomic tree fitted with hundreds of 18S leaves

Author

DeBiasse, Melissa B., primary, Buckenmeyer, Ariane, additional, Macrander, Jason, additional, Babonis, Leslie S., additional, Bentlage, Bastian, additional, Cartwright, Paulyn, additional, Prada, Carlos, additional, Reitzel, Adam M., additional, Stampar, Sergio N., additional, Collins, Allen G., additional, Daly, Marymegan, additional, and Ryan, Joseph F., additional

Published
2022
Full Text
View/download PDF

196. Contributors

Author

Abu Bakar, Muhammad Saifullah, Amsaveni, Sakkarapani, Anaswara, K., Balkanlı, Didem, Barajas-Solano, Andrés F., Bassi, Amarjeet, Behera, Bunushree, Bilad, Muhammad Roil, Charoenrat, Theppanya, Chittapun, Supenya, Contreras-Ropero, Jefferson E., Cuello, Joel L., Culaba, Alvin B., Dani Nandiyanto, Asep Bayu, Danquah, Michael K., de Dios-Ávila, Ndahita, de Lima, Júlio Gabriel Oliveira, Demaman Oro, Carolina E., Deprá, Mariany Costa, Dhar, Dolly Wattal, Dharani, Gopal, Dias, Rosangela Rodrigues, dos Santos, Maicon Sérgio N., Fahrurrozi, Fawcett, Claire A., García-Martínez, Janet B., Guo, Haixin, Gupta, Neeru, Gusbeth, Christian (Adrian), Gyau, Theophilus, Hashmi, Zubair, İnan, Benan, Jacob-Lopes, Eduardo, Jayakumar, Tharunkumar, Jutur, Pannaga Pavan, Kantrong, Hataichanok, Karaca, Gülcan Ayşin, Karacaoğlu, Beyza, Koçer, Anıl Tevfik, Kolli Venkata, Supraja, Kongsinkaew, Chatchol, Korsah, Maame A., Kumar, Gourav, Laamanen, Corey A., Lim, Jun Wei, Lyon, Daron, Mussagy, Cassamo Usemane, Neder-Suarez, David, Nesamma, Asha Arumugam, Neves, Nathália de Andrade, Ong, Hui Lin, Pan-utai, Wanida, Radhakrishnan, Vandana, Rahman, Ehsanur, Rakesh, Suchitra, Ranjith, Sandu Sai, Ray, Bobita, Rehmanji, Mohammed, Rikta, Sharmin Yousuf, Rout, Prangya Ranjan, S., Mari Selvam, Santos-Ebinuma, Valéria de Carvalho, Schneider, Adriane Terezinha, Scott, John A., Senhorinho, Gerusa N.A., Shokravi, Zahra, Shokravi, Hoofar, Silva Machado, Richard Luan, Singh, Rabinder, Soto-Caballero, Mayra Cristina, Sraboni, Hosney Jahan, Srinophakun, Penjit, Sánchez-Vega, Rogelio, Thanapimmetha, Anusith, Thilakan, Mary Leema J., Tong, Li, Tres, Marcus V., Ummalyma, Sabeela Beevi, Vendruscolo, Raquel Guidetti, Veríssimo, Nathalia Vieira Porphirio, Villagracia, Al Rey C., Wancura, João Henrique C., Xupeng, Cao, Zabot, Giovani L., Zaini, Juliana, Zepka, Leila Queiroz, Zhou, Jiajiang, Zuorro, Antonio, and Rodríguez-Roque, María Janeth

Published
2025
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results